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Paulin LM, Halenar MJ, Edwards KC, Lauten K, Taylor K, Brunette M, Tanski S, MacKenzie T, Stanton CA, Hatsukami D, Hyland A, Mahoney MC, Niaura R, Trinidad D, Blanco C, Compton W, Gardner LD, Kimmel HL, Cummings KM, Lauterstein D, Roh EJ, Marshall D, Sargent JD. Relationship Between Tobacco Product Use and Health-Related Quality of Life Among Individuals With COPD in Waves 1-5 (2013-2019) of the Population Assessment of Tobacco and Health Study. Chronic Obstr Pulm Dis 2024; 11:68-82. [PMID: 38113525 PMCID: PMC10913919 DOI: 10.15326/jcopdf.2023.0422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/06/2023] [Indexed: 12/21/2023]
Abstract
Introduction We examined the association between tobacco product use and health-related quality of life (HRQoL) among individuals with chronic obstructive pulmonary disease (COPD) in Waves 1-5 of the Population Assessment of Tobacco and Health (PATH) Study. Methods Adults ≥40 years with an ever COPD diagnosis were included in cross-sectional (Wave 5) and longitudinal (Waves 1 to 5) analyses. Tobacco use included 13 mutually exclusive categories of past 30-day (P30D) single use and polyuse with P30D exclusive cigarette use and ≥5-year cigarette cessation as reference groups. Multivariable linear regression and generalized estimating equations (GEE) were used to examine the association between tobacco use and HRQoL as measured by the Patient-Reported Outcomes Measurement Information System (PROMIS) Global-10 questionnaire. Results Of 1670 adults, 79.4% ever used cigarettes; mean (standard error [SE]) pack years was 30.9 (1.1). In cross-sectional analysis, P30D exclusive cigarette use, and e-cigarette/cigarette dual use were associated with worse HRQoL compared to ≥5-year cigarette cessation. Compared to P30D exclusive cigarette use, never tobacco use and ≥5-year cigarette cessation were associated with better HRQoL, while e-cigarette/cigarette dual use had worse HRQoL. Longitudinally (n=686), e-cigarette/cigarette dual use was associated with worsening HRQoL compared to both reference groups. Only never tobacco use was associated with higher HRQoL over time compared to P30D exclusive cigarette use. Conclusions E-cigarette/cigarette dual use was associated with worse HRQoL compared to ≥5-year cigarette cessation and exclusive cigarette use. Never use and ≥5-year cigarette cessation were the only categories associated with higher HRQoL compared to exclusive cigarette use. Findings highlight the importance of complete smoking cessation for individuals with COPD.
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Affiliation(s)
- Laura M. Paulin
- Geisel School of Medicine at Dartmouth, The C. Everett Koop Institute at Dartmouth, Hanover, New Hampshire, United States
| | - Michael J. Halenar
- Behavioral Health and Health Policy Practice, Westat, Rockville, Maryland, United States
| | - Kathryn C. Edwards
- Behavioral Health and Health Policy Practice, Westat, Rockville, Maryland, United States
| | - Kristin Lauten
- Behavioral Health and Health Policy Practice, Westat, Rockville, Maryland, United States
| | - Kristie Taylor
- Behavioral Health and Health Policy Practice, Westat, Rockville, Maryland, United States
| | - Mary Brunette
- Geisel School of Medicine at Dartmouth, The C. Everett Koop Institute at Dartmouth, Hanover, New Hampshire, United States
| | - Susanne Tanski
- Geisel School of Medicine at Dartmouth, The C. Everett Koop Institute at Dartmouth, Hanover, New Hampshire, United States
| | - Todd MacKenzie
- Geisel School of Medicine at Dartmouth, The C. Everett Koop Institute at Dartmouth, Hanover, New Hampshire, United States
| | - Cassandra A. Stanton
- Behavioral Health and Health Policy Practice, Westat, Rockville, Maryland, United States
| | - Dorothy Hatsukami
- Department of Psychiatry and Behavioral Sciences, University of Minnesota, Minneapolis, Minnesota, United States
| | - Andrew Hyland
- Department of Health Behavior, Roswell Park Comprehensive Cancer Center, Buffalo, New York, United States
| | - Martin C. Mahoney
- Department of Health Behavior, Roswell Park Comprehensive Cancer Center, Buffalo, New York, United States
| | - Ray Niaura
- School of Global Public Health, New York University, New York, New York, United States
| | - Dennis Trinidad
- University of California at San Diego, La Jolla, California, United States
| | - Carlos Blanco
- National Institute on Drug Abuse, National Institutes of Health, Bethesda, Maryland, United States
| | - Wilson Compton
- National Institute on Drug Abuse, National Institutes of Health, Bethesda, Maryland, United States
| | - Lisa D. Gardner
- Center for Tobacco Products, Food and Drug Administration, Silver Spring, Maryland, United States
| | - Heather L. Kimmel
- National Institute on Drug Abuse, National Institutes of Health, Bethesda, Maryland, United States
| | - K. Michael Cummings
- Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, South Carolina, United States
| | - Dana Lauterstein
- Center for Tobacco Products, Food and Drug Administration, Silver Spring, Maryland, United States
| | - Esther J. Roh
- Center for Tobacco Products, Food and Drug Administration, Silver Spring, Maryland, United States
| | - Daniela Marshall
- National Institute on Drug Abuse, National Institutes of Health, Bethesda, Maryland, United States
- Axle Informatics, Rockville, Maryland, United States
| | - James D. Sargent
- Geisel School of Medicine at Dartmouth, The C. Everett Koop Institute at Dartmouth, Hanover, New Hampshire, United States
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2
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Paulin LM, Halenar MJ, Edwards KC, Lauten K, Stanton CA, Taylor K, Hatsukami D, Hyland A, MacKenzie T, Mahoney MC, Niaura R, Trinidad D, Blanco C, Compton WM, Gardner LD, Kimmel HL, Lauterstein D, Marshall D, Sargent JD. Association of tobacco product use with chronic obstructive pulmonary disease (COPD) prevalence and incidence in Waves 1 through 5 (2013-2019) of the Population Assessment of Tobacco and Health (PATH) Study. Respir Res 2022; 23:273. [PMID: 36183112 PMCID: PMC9526897 DOI: 10.1186/s12931-022-02197-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 09/22/2022] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND We examined the association of non-cigarette tobacco use on chronic obstructive pulmonary disease (COPD) risk in the Population Assessment of Tobacco and Health (PATH) Study. METHODS There were 13,752 participants ≥ 40 years with Wave 1 (W1) data for prevalence analyses, including 6945 adults without COPD for incidence analyses; W1-5 (2013-2019) data were analyzed. W1 tobacco use was modeled as 12 mutually-exclusive categories of past 30-day (P30D) single and polyuse, with two reference categories (current exclusive cigarette and never tobacco). Prevalence and incidence ratios of self-reported physician-diagnosed COPD were estimated using weighted multivariable Poisson regression. RESULTS W1 mean (SE) age was 58.1(0.1) years; mean cigarette pack-years was similar for all categories involving cigarettes and exclusive use of e-cigarettes (all > 20), greater than exclusive cigar users (< 10); and COPD prevalence was 7.7%. Compared to P30D cigarette use, never tobacco, former tobacco, and cigar use were associated with lower COPD prevalence (RR = 0.33, (95% confidence interval-CI) [0.26, 0.42]; RR = 0.57, CI [0.47, 0.70]; RR = 0.46, CI [0.28, 0.76], respectively); compared to never tobacco use, all categories except cigar and smokeless tobacco use were associated with higher COPD prevalence (RR former = 1.72, CI [1.33, 2.23]; RR cigarette = 3.00, CI [2.37, 3.80]; RR e-cigarette = 2.22, CI [1.44, 3.42]; RR cigarette + e-cigarette = 3.10, CI [2.39, 4.02]; RR polycombusted = 3.37, CI [2.44, 4.65]; RR polycombusted plus noncombusted = 2.75, CI]1.99, 3.81]). COPD incidence from W2-5 was 5.8%. Never and former tobacco users had lower COPD risk compared to current cigarette smokers (RR = 0.52, CI [0.35, 0.77]; RR = 0.47, CI [0.32, 0.70], respectively). Compared to never use, cigarette, smokeless, cigarette plus e-cigarette, and polycombusted tobacco use were associated with higher COPD incidence (RR = 1.92, CI [1.29, 2.86]; RR = 2.08, CI [1.07, 4.03]; RR = 1.99, CI [1.29, 3.07]; RR = 2.59, CI [1.60, 4.21], respectively); exclusive use of e-cigarettes was not (RR = 1.36, CI [0.55, 3.39]). CONCLUSIONS E-cigarettes and all use categories involving cigarettes were associated with higher COPD prevalence compared to never use, reflecting, in part, the high burden of cigarette exposure in these groups. Cigarette-but not exclusive e-cigarette-use was also strongly associated with higher COPD incidence. Compared to cigarette use, only quitting tobacco was protective against COPD development.
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Affiliation(s)
- Laura M Paulin
- Geisel School of Medicine at Dartmouth, The C. Everett Koop Institute at Dartmouth, Hanover, NH, USA.
| | - Michael J Halenar
- Behavioral Health and Health Policy Practice, Westat, Rockville, MD, USA
| | - Kathryn C Edwards
- Behavioral Health and Health Policy Practice, Westat, Rockville, MD, USA
| | - Kristin Lauten
- Behavioral Health and Health Policy Practice, Westat, Rockville, MD, USA
| | | | - Kristie Taylor
- Behavioral Health and Health Policy Practice, Westat, Rockville, MD, USA
| | - Dorothy Hatsukami
- Department of Psychiatry and Behavioral Sciences, University of Minnesota, Minneapolis, MN, USA
| | - Andrew Hyland
- Department of Health Behavior, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Todd MacKenzie
- Geisel School of Medicine at Dartmouth, The C. Everett Koop Institute at Dartmouth, Hanover, NH, USA
| | - Martin C Mahoney
- Department of Health Behavior, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Ray Niaura
- New York University School of Global Public Health, New York, NY, 10012, USA
| | - Dennis Trinidad
- University of California at San Diego, La Jolla, CA, 92037, USA
| | - Carlos Blanco
- National Institute on Drug Abuse, National Institutes of Health, Bethesda, MD, USA
| | - Wilson M Compton
- National Institute on Drug Abuse, National Institutes of Health, Bethesda, MD, USA
| | - Lisa D Gardner
- Center for Tobacco Products, Food and Drug Administration, Silver Spring, MD, USA
| | - Heather L Kimmel
- National Institute on Drug Abuse, National Institutes of Health, Bethesda, MD, USA
| | - Dana Lauterstein
- Center for Tobacco Products, Food and Drug Administration, Silver Spring, MD, USA
| | - Daniela Marshall
- National Institute on Drug Abuse, National Institutes of Health, Bethesda, MD, USA
- Kelly Government Solutions, Rockville, MD, USA
| | - James D Sargent
- Geisel School of Medicine at Dartmouth, The C. Everett Koop Institute at Dartmouth, Hanover, NH, USA
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Donnelly KZ, Jeffreys C, MacKenzie T, McDonnell L, Black H, Bruce ML, Smith AD. A crossover pilot trial of the feasibility, acceptability, and effectiveness of LoveYourBrain Yoga for community-dwelling adults with multiple sclerosis. Complement Ther Clin Pract 2022; 49:101607. [PMID: 35780542 DOI: 10.1016/j.ctcp.2022.101607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 05/21/2022] [Accepted: 05/22/2022] [Indexed: 11/03/2022]
Abstract
BACKGROUND AND PURPOSE Among people with multiple sclerosis (MS), yoga has potential to improve fatigue and other symptoms that undermine quality of life. The aim of this study was to assess the feasibility, acceptability, and effectiveness of LoveYourBrain Yoga, a six-week yoga with psychoeducation program, on fatigue and other health-related outcomes among people with MS in a rural, community-based setting in the United States. METHODS This non-randomized 2x2 crossover pilot trial compared LoveYourBrain Yoga to a control among 15 people with MS. People were eligible if they were adults with MS (EDSS score ≤6), English-speaking, and ambulatory. Paired t-tests and Wilcoxon signed rank sum analyses assessed mean differences in PROMIS-FatigueMS, Multiple Sclerosis Impact Scale, Symbol Digit Modalities Test, NIH Neuro-QoL measures, and Liverpool Self-Efficacy scale. We assessed feasibility using recruitment and retention rates, mean attendance, fidelity, and acceptability using satisfaction measures. RESULTS Significant improvements in fatigue (MD -4.34, SD 5.26, p = 0.012), positive affect and wellbeing (MD 2.76, SD 3.99, p = 0.028), and anxiety (MD -4.42, SD 5.36, p = 0.012) were found after LoveYourBrain Yoga compared to the control. Participants reported high satisfaction (M 9.5, SD 1.4) and a majority (92.3%) reported 'Definitely, yes' to recommending it to a friend or family. CONCLUSION LoveYourBrain Yoga is feasible and acceptable when implemented in a rural, community-based setting for people with MS. It may improve a range of MS symptoms and offer a means for acquiring new skills for stress reduction, anxiety management, and overall wellbeing.
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Affiliation(s)
- Kyla Z Donnelly
- The LoveYourBrain Foundation Windsor, Vermont, USA; Department of Psychiatry, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA.
| | - Charlotte Jeffreys
- Department of Neurology, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Todd MacKenzie
- Department of Biomedical Data Science, Geisel School of Medicine, Lebanon, NH, USA
| | - Lauren McDonnell
- Department of Biomedical Data Science, Geisel School of Medicine, Lebanon, NH, USA
| | | | - Martha L Bruce
- Department of Psychiatry, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Andrew D Smith
- Department of Neurology, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
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4
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Brown JR, Ricket IM, Reeves RM, Shah RU, Goodrich CA, Gobbel G, Stabler ME, Perkins AM, Minter F, Cox KC, Dorn C, Denton J, Bray BE, Gouripeddi R, Higgins J, Chapman WW, MacKenzie T, Matheny ME. Information Extraction From Electronic Health Records to Predict Readmission Following Acute Myocardial Infarction: Does Natural Language Processing Using Clinical Notes Improve Prediction of Readmission? J Am Heart Assoc 2022; 11:e024198. [PMID: 35322668 PMCID: PMC9075435 DOI: 10.1161/jaha.121.024198] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Background Social risk factors influence rehospitalization rates yet are challenging to incorporate into prediction models. Integration of social risk factors using natural language processing (NLP) and machine learning could improve risk prediction of 30‐day readmission following an acute myocardial infarction. Methods and Results Patients were enrolled into derivation and validation cohorts. The derivation cohort included inpatient discharges from Vanderbilt University Medical Center between January 1, 2007, and December 31, 2016, with a primary diagnosis of acute myocardial infarction, who were discharged alive, and not transferred from another facility. The validation cohort included patients from Dartmouth‐Hitchcock Health Center between April 2, 2011, and December 31, 2016, meeting the same eligibility criteria described above. Data from both sites were linked to Centers for Medicare & Medicaid Services administrative data to supplement 30‐day hospital readmissions. Clinical notes from each cohort were extracted, and an NLP model was deployed, counting mentions of 7 social risk factors. Five machine learning models were run using clinical and NLP‐derived variables. Model discrimination and calibration were assessed, and receiver operating characteristic comparison analyses were performed. The 30‐day rehospitalization rates among the derivation (n=6165) and validation (n=4024) cohorts were 15.1% (n=934) and 10.2% (n=412), respectively. The derivation models demonstrated no statistical improvement in model performance with the addition of the selected NLP‐derived social risk factors. Conclusions Social risk factors extracted using NLP did not significantly improve 30‐day readmission prediction among hospitalized patients with acute myocardial infarction. Alternative methods are needed to capture social risk factors.
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Affiliation(s)
- Jeremiah R Brown
- Departments of Epidemiology and Biomedical Data Science Dartmouth Geisel School of Medicine Hanover NH
| | - Iben M Ricket
- Departments of Epidemiology and Biomedical Data Science Dartmouth Geisel School of Medicine Hanover NH
| | - Ruth M Reeves
- Department of Biomedical Informatics Vanderbilt University Medical Center Nashville TN.,Geriatric Research Education and Clinical Care Center Tennessee Valley Healthcare System VA Nashville TN
| | - Rashmee U Shah
- Division of Cardiovascular Medicine University of Utah School of Medicine Salt Lake City UT
| | - Christine A Goodrich
- Departments of Epidemiology and Biomedical Data Science Dartmouth Geisel School of Medicine Hanover NH
| | - Glen Gobbel
- Department of Biomedical Informatics Vanderbilt University Medical Center Nashville TN.,Geriatric Research Education and Clinical Care Center Tennessee Valley Healthcare System VA Nashville TN.,Department of Biostatistics Vanderbilt University Medical Center Nashville TN.,Division of General Internal Medicine Vanderbilt University Medical Center Nashville TN
| | - Meagan E Stabler
- Departments of Epidemiology and Biomedical Data Science Dartmouth Geisel School of Medicine Hanover NH
| | - Amy M Perkins
- Geriatric Research Education and Clinical Care Center Tennessee Valley Healthcare System VA Nashville TN.,Department of Biostatistics Vanderbilt University Medical Center Nashville TN
| | - Freneka Minter
- Department of Biomedical Informatics Vanderbilt University Medical Center Nashville TN
| | - Kevin C Cox
- Departments of Epidemiology and Biomedical Data Science Dartmouth Geisel School of Medicine Hanover NH
| | - Chad Dorn
- Department of Biomedical Informatics Vanderbilt University Medical Center Nashville TN
| | - Jason Denton
- Department of Biomedical Informatics Vanderbilt University Medical Center Nashville TN
| | - Bruce E Bray
- Division of General Internal Medicine Vanderbilt University Medical Center Nashville TN.,Department of Biomedical Informatics University of Utah School of Medicine Salt Lake City UT
| | - Ramkiran Gouripeddi
- Department of Biomedical Informatics University of Utah School of Medicine Salt Lake City UT.,Utah Clinical & Translational Science InstituteUniversity of Utah Salt Lake City UT
| | - John Higgins
- Departments of Epidemiology and Biomedical Data Science Dartmouth Geisel School of Medicine Hanover NH
| | - Wendy W Chapman
- Centre for Digital Transformation of Health University of Melbourne Melbourne Victoria Australia
| | - Todd MacKenzie
- Departments of Epidemiology and Biomedical Data Science Dartmouth Geisel School of Medicine Hanover NH
| | - Michael E Matheny
- Department of Biomedical Informatics Vanderbilt University Medical Center Nashville TN.,Geriatric Research Education and Clinical Care Center Tennessee Valley Healthcare System VA Nashville TN.,Department of Biostatistics Vanderbilt University Medical Center Nashville TN.,Division of General Internal Medicine Vanderbilt University Medical Center Nashville TN
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5
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McGrath SP, Perreard I, MacKenzie T, Calderwood M. Improvement of sepsis identification through multi-year comparison of sepsis and early warning scores. Am J Emerg Med 2021; 51:239-247. [PMID: 34775198 DOI: 10.1016/j.ajem.2021.10.046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 10/25/2021] [Accepted: 10/27/2021] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Sepsis remains a leading cause of death among inpatients. Scoring systems designed to identify inpatients with sepsis currently have limited effectiveness. This single institution, retrospective, case-control study aims to improve sepsis decision support tool performance using temporal analyses of sepsis-specific and general deterioration scoring systems. METHODS Sequential Organ Failure Assessment, National Early Warning Scores (NEWS), and Modified Early Warning Scores were calculated using four years of inpatient data. Sensitivity and specificity analyses compared performance of each score, calculated as a function of both various score cut-off values and time before sepsis diagnosis using established proxies for identifying clinical suspicion for sepsis. RESULTS NEWS had the best sensitivity-specificity performance (AUROC 82.7) when examining various score cutoffs and time intervals during which diagnosis criteria were met. Comparison of false positives/negatives with various score thresholds showed a low rate of false positives with a NEWS of 7. Score trends in the hours leading up to sepsis criteria being met showed a marked increase for the sepsis group while for the cases there was a decrease during a comparable period. CONCLUSIONS Temporal analyses of scores for patients coded as having sepsis provides novel insights into patterns of deterioration. The methods and results provide practical details demonstrating how general deterioration algorithms can be used to alert trained responders to potential cases of sepsis to improve sepsis recognition and treatment opportunities.
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Affiliation(s)
- Susan P McGrath
- Analytics Institute and Department of Anesthesiology, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA.
| | - Irina Perreard
- Analytics Institute, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Todd MacKenzie
- Department of Biomedical Data Science, Dartmouth College, Hanover, NH, USA
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6
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Allman PH, Aban I, Long DM, Patki A, MacKenzie T, Irvin MR, Lange LA, Lange E, Cutter G, Tiwari HK. Mendelian randomization in the multivariate general linear model framework. Genet Epidemiol 2021; 46:17-31. [PMID: 34672390 DOI: 10.1002/gepi.22435] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 10/10/2021] [Accepted: 10/11/2021] [Indexed: 11/12/2022]
Abstract
Mendelian randomization (MR) is an application of instrumental variable (IV) methods to observational data in which the IV is a genetic variant. MR methods applicable to the general exponential family of distributions are currently not well characterized. We adapt a general linear model framework to the IV setting and propose a general MR method applicable to any full-rank distribution from the exponential family. Empirical bias and coverage are estimated via simulations. The proposed method is compared to several existing MR methods. Real data analyses are performed using data from the REGARDS study to estimate the potential causal effect of smoking frequency on stroke risk in African Americans. In simulations with binary variates and very weak instruments the proposed method had the lowest median [Q1 , Q3 ] bias (0.10 [-3.68 to 3.62]); compared with 2SPS (0.27 [-3.74 to 4.26]) and the Wald method (-0.69 [-1.72 to 0.35]). Low bias was observed throughout other simulation scenarios; as well as more than 90% coverage for the proposed method. In simulations with count variates, the proposed method performed comparably to 2SPS; the Wald method maintained the most consistent low bias; and 2SRI was biased towards the null. Real data analyses find no evidence for a causal effect of smoking frequency on stroke risk. The proposed MR method has low bias and acceptable coverage across a wide range of distributional scenarios and instrument strengths; and provides a more parsimonious framework for asymptotic hypothesis testing compared to existing two-stage procedures.
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Affiliation(s)
- Phillip H Allman
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Inmaculada Aban
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Dustin M Long
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Amit Patki
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Todd MacKenzie
- Department of Biomedical Data Science, Dartmouth College, Hanover, New Hampshire, USA
| | - Marguerite R Irvin
- Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Leslie A Lange
- Division of Biomedical Informatics and Personalized Medicine, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Ethan Lange
- Division of Biomedical Informatics and Personalized Medicine, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Gary Cutter
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Hemant K Tiwari
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
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MacKenzie T, Lebeaux R. Mortality versus Municipal and State Government Spending in American Cities. J Urban Health 2021; 98:665-675. [PMID: 33761065 PMCID: PMC8566648 DOI: 10.1007/s11524-021-00516-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/08/2021] [Indexed: 11/29/2022]
Abstract
The USA leads the world in healthcare spending but trails dozens of countries in life expectancy. Government spending may reduce overall mortality by redistributing resources from the rich to the poor. We linked mortality data from 2006 to 2015 to municipal and state government spending in 149 of the largest American cities. We modeled the association of mortality with city and state government spending per capita in 2005 using weighted linear regression. A 10% increase in state government expenditures was associated (P = 0.008) with a 1.4% (95%CI: 0.4-2.4%) reduction in mortality in American cities. Total city government expenditures were not associated with mortality (P > 0.10). However, among Whites, increases in city government spending were associated with a reduction in mortality of 4.8% (2.1-7.5%), but among Blacks and Asians, increased city government spending was associated with respective mortality increases of 1.7% (0.6-2.9%) and 5.1% (2.1-6.2%). State government spending is associated with reduced mortality in American cities. City government spending appears to benefit White longevity and hurt non-White longevity.
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Affiliation(s)
- Todd MacKenzie
- Departments of Biomedical Data Science, The Dartmouth Institute for Health Policy and Clinical Practice and Medicine, Geisel School of Medicine at Dartmouth College, Hanover, NH, USA.
| | - Rebecca Lebeaux
- Department of Epidemiology, Geisel School of Medicine at Dartmouth College, Hanover, NH, USA
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8
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McGrath SP, MacKenzie T, Perreard I, Blike G. Characterizing rescue performance in a tertiary care medical center: a systems approach to provide management decision support. BMC Health Serv Res 2021; 21:843. [PMID: 34416882 PMCID: PMC8379722 DOI: 10.1186/s12913-021-06855-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 07/31/2021] [Indexed: 11/11/2022] Open
Abstract
Background Allocation of limited resources to improve quality, patient safety, and outcomes is a decision-making challenge health care leaders face every day. While much valuable health care management research has concentrated on administrative data analysis, this approach often falls short of providing actionable information essential for effective management of specific system implementations and complex systems. This comprehensive performance analysis of a hospital-wide system illustrates application of various analysis approaches to support understanding specific system behaviors and identify leverage points for improvement. The study focuses on performance of a hospital rescue system supporting early recognition and response to patient deterioration, which is essential to reduce preventable inpatient deaths. Methods Retrospective analysis of tertiary care hospital inpatient and rescue data was conducted using a systems analysis approach to characterize: patient demographics; rescue activation types and locations; temporal patterns of activation; and associations of patient factors, including complications, with post-rescue care disposition and outcomes. Results Increases in bedside consultations (20% per year) were found with increased rescue activations during periods of resource limitations and changes (e.g., shift changes, weekends). Cardiac arrest, respiratory failure, and sepsis complications present the highest risk for rescue and death. Distributions of incidence of rescue and death by day of patient stay may suggest opportunities for earlier recognition. Conclusions Specific findings highlight the potential of using rescue-related risk and targeted resource deployment strategies to improve early detection of deterioration. The approach and methods applied can be used by other institutions to understand performance and allow rational incremental improvements to complex care delivery systems. Supplementary Information The online version contains supplementary material available at 10.1186/s12913-021-06855-w.
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Affiliation(s)
- Susan P McGrath
- Analytics Institute, Dartmouth-Hitchcock Health, Lebanon, NH, 03756, USA.
| | - Todd MacKenzie
- Department of Biomedical Data Science, Dartmouth College, Hanover, NH, 03755, USA
| | - Irina Perreard
- Analytics Institute, Dartmouth-Hitchcock Health, Lebanon, NH, 03756, USA
| | - George Blike
- Department of Anesthesiology, Dartmouth-Hitchcock Health, Lebanon, NH, 03756, USA
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Allman PH, Aban I, Long DM, Bridges SL, Srinivasasainagendra V, MacKenzie T, Cutter G, Tiwari HK. A novel Mendelian randomization method with binary risk factor and outcome. Genet Epidemiol 2021; 45:549-560. [PMID: 33998053 DOI: 10.1002/gepi.22387] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 03/17/2021] [Accepted: 04/28/2021] [Indexed: 11/07/2022]
Abstract
BACKGROUND Mendelian randomization (MR) applies instrumental variable (IV) methods to observational data using a genetic variant as an IV. Several Monte-Carlo studies investigate the performance of MR methods with binary outcomes, but few consider them in conjunction with binary risk factors. OBJECTIVE To develop a novel MR estimator for scenarios with a binary risk factor and outcome; and compare to existing MR estimators via simulations and real data analysis. METHODS A bivariate Bernoulli distribution is adapted to the IV setting. Empirical bias and asymptotic coverage probabilities are estimated via simulations. The proposed method is compared to the Wald method, two-stage predictor substitution (2SPS), two-stage residual inclusion (2SRI), and the generalized method of moments (GMM). An analysis is performed using existing data from the CLEAR study to estimate the potential causal effect of smoking on rheumatoid arthritis risk in African Americans. RESULTS Bias was low for the proposed method and comparable to 2SPS. The Wald method was often biased towards the null. Coverage was adequate for the proposed method, 2SPS, and 2SRI. Coverage for the Wald and GMM methods was poor in several scenarios. The causal effect of ever smoking on rheumatoid arthritis risk was not statistically significant using a variety of genetic instruments. CONCLUSIONS Simulations suggest the proposed MR method is sound with binary risk factors and outcomes, and comparable to 2SPS and 2SRI in terms of bias. The proposed method also provides more natural framework for hypothesis testing compared to 2SPS or 2SRI, which require ad-hoc variance adjustments.
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Affiliation(s)
- Philip H Allman
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Inmaculada Aban
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Dustin M Long
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - S Louis Bridges
- Department of Medicine, Hospital for Special Surgery and Weill Cornell Medicine Center, New York, New York, USA
| | | | - Todd MacKenzie
- Department of Biomedical Data Science, Dartmouth College, Hanover, New Hampshire, USA
| | - Gary Cutter
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Hemant K Tiwari
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
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10
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McGrath SP, Perreard IM, MacKenzie T, Blike GT. Patterns in continuous pulse oximetry data prior to pulseless electrical activity arrest in the general care setting. J Clin Monit Comput 2020; 35:537-545. [PMID: 32270344 DOI: 10.1007/s10877-020-00509-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 04/03/2020] [Indexed: 11/26/2022]
Abstract
The study objective was to understand if features derived from continuous pulse oximetry data can provide advanced warning of pulseless electrical activity arrest in the general care inpatient setting. Retrospective analysis of SpO2 and pulse rate data derived from continuous pulse oximetry was performed for pulseless electrical activity (n = 38) and control (n = 42) patient cohorts. Measures of central tendency and variation over time intervals ranging from 1 min to 1 h were used for inter- and intra-group comparisons. Logistic regression was applied to understand ability of features to predict pulseless electrical activity in future time intervals. Overall, the pulseless electrical activity arrest group tended to have lower mean SpO2 and higher mean pulse rate values than the control group. SpO2 and pulse rate variability was higher in the pulseless electrical activity arrest cohort. Changes in variability were observed beginning several hours prior to the rescue event. Up to 20 min before rescue events, pulse rate features were significantly different from feature values for the preceding 30-min interval (> 10% difference in mean, > 46% difference in range). Similar results were found for SpO2 features 10 min before the event (> 4% difference in mean, > 60% difference in range). There is a significant difference in SpO2 and pulse rate features derived from continuous pulse oximetry between pulseless electrical activity and control groups. Integration of automated feature calculation and clinician notification into clinical monitoring and information systems may increase patient safety by supporting early detection of such events.
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Affiliation(s)
- Susan P McGrath
- Director, Failure To Rescue Patient Safety Learning Laboratory, Department of Anesthesiology, 1 Medical Center Drive, Dartmouth-Hitchcock Medical Center, Lebanon, NH, 03756, USA.
| | - Irina M Perreard
- Senior Research Investigator, Department of Anesthesiology, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Todd MacKenzie
- Professor of Biomedical Data Science, Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
| | - George T Blike
- Chief Quality and Value Officer, Dartmouth-Hitchcock Health System, Department of Anesthesiology, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
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11
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Brenner R, Madhusoodanan S, Logiudice J, Castell G, MacKenzie T, O'Shaughnessy PM. A comparison study of the turnaround time for telepsychiatry versus face-to-face consultations in general hospital nonpsychiatric emergency rooms. Ann Clin Psychiatry 2020; 32:12-16. [PMID: 31990965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Abstract
BACKGROUND Psychiatric consultation services, particularly for emergencies, are limited in many parts of the United States. Telepsychiatry services are helping to bridge the gap, and are gaining acceptance and popularity. There is paucity of publications regarding comparison of turnaround time for consultations between video conferencing and traditional face-to-face psychiatric consultations in general hospital nonpsychiatric emergency departments (EDs). Our study aimed to address turnaround time and patient satisfaction. METHODS Data regarding the turnaround time for emergency psychiatric consultations using telepsychiatry in general hospital EDs was collected retrospectively and compared with the time for face-to-face traditional consultations. A patient satisfaction survey was also conducted after the telepsychiatry consultation. Statistical analysis of the data was done after the study was completed. RESULTS The telepsychiatry group included 206 participants and the control group had 186 participants. There was an 84% reduction in the turnaround time for telepsychiatry consults (95% confidence interval, 81% to 86%). A patient satisfaction survey showed 97% satisfaction with telepsychiatry services. Gender and age did not modify the effect of telepsychiatry on time to consult (P > .10). CONCLUSIONS The reduction in the turnaround time and improved patient satisfaction indicate that telepsychiatry services can improve the quality of care for patients in need of emergency services.
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Affiliation(s)
| | - Subramoniam Madhusoodanan
- Associate Chairman, Department of Psychiatry, St. John's Episcopal Hospital, Far Rockaway, NY 11691 USA. E-MAIL:
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12
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McGrath SP, Perreard I, Ramos J, McGovern KM, MacKenzie T, Blike G. A Systems Approach to Design and Implementation of Patient Assessment Tools in the Inpatient Setting. Adv Health Care Manag 2019; 18. [PMID: 32077656 DOI: 10.1108/s1474-823120190000018012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
Failure to rescue events, or events involving preventable deaths from complications, are a significant contributor to inpatient mortality. While many interventions have been designed and implemented over several decades, this patient safety issue remains at the forefront of concern for most hospitals. In the first part of this study, the development and implementation of one type of highly studied and widely adopted rescue intervention, algorithm-based patient assessment tools, is examined. The analysis summarizes how a lack of systems-oriented approaches in the design and implementation of these tools has resulted in suboptimal understanding of patient risk of mortality and complications and the early recognition of patient deterioration. The gaps identified impact several critical aspects of excellent patient care, including information-sharing across care settings, support for the development of shared mental models within care teams, and access to timely and accurate patient information. This chapter describes the use of several system-oriented design and implementation activities to establish design objectives, model clinical processes and workflows, and create an extensible information system model to maximize the benefits of patient state and risk assessment tools in the inpatient setting. A prototype based on the product of the design activities is discussed along with system-level considerations for implementation. This study also demonstrates the effectiveness and impact of applying systems design principles and practices to real-world clinical applications.
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13
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Harrington L, diFlorio-Alexander R, Trinh K, MacKenzie T, Suriawinata A, Hassanpour S. Prediction of Atypical Ductal Hyperplasia Upgrades Through a Machine Learning Approach to Reduce Unnecessary Surgical Excisions. JCO Clin Cancer Inform 2019; 2:1-11. [PMID: 30652620 PMCID: PMC6874044 DOI: 10.1200/cci.18.00083] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PURPOSE Surgical excision is currently recommended for all occurrences of atypical ductal hyperplasia (ADH) found on core needle biopsies for malignancy diagnoses and treatment of lesions. The excision of all ADH lesions may lead to overtreatment, which results in invasive surgeries for benign lesions in many women. A machine learning method to predict ADH upgrade may help clinicians and patients decide whether combined active surveillance and hormonal therapy is a reasonable alternative to surgical excision. METHODS The following six machine learning models were developed to predict ADH upgrade from core needle biopsy: gradient-boosting trees, random forest, radial support vector machine (SVM), weighted K-nearest neighbors (KNN), logistic elastic net, and logistic regression. The study cohort consisted of 128 lesions from 124 women at a tertiary academic care center in New Hampshire who had ADH on core needle biopsy and who underwent an associated surgical excision from 2011 to 2017. RESULTS The best-performing models were gradient-boosting trees (area under the curve [AUC], 68%; accuracy, 78%) and random forest (AUC, 67%; accuracy, 77%). The top five most important features that determined ADH upgrade were age at biopsy, lesion size, number of biopsies, needle gauge, and personal and family history of breast cancer. Using the random forest model, 98% of all malignancies would have been diagnosed through surgical biopsies, whereas 16% of unnecessary surgeries on benign lesions could have been avoided (ie, 87% sensitivity at 45% specificity). CONCLUSION These results add to the growing body of support for machine learning models as useful aids for clinicians and patients in decisions about the clinical management of ADH.
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Affiliation(s)
- Lia Harrington
- Lia Harrington, Todd MacKenzie, and Saeed Hassanpour, Geisel School of Medicine at Dartmouth College, Hanover; Roberta diFlorio-Alexander, Katherine Trinh, and Arief Suriawinata, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | - Roberta diFlorio-Alexander
- Lia Harrington, Todd MacKenzie, and Saeed Hassanpour, Geisel School of Medicine at Dartmouth College, Hanover; Roberta diFlorio-Alexander, Katherine Trinh, and Arief Suriawinata, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | - Katherine Trinh
- Lia Harrington, Todd MacKenzie, and Saeed Hassanpour, Geisel School of Medicine at Dartmouth College, Hanover; Roberta diFlorio-Alexander, Katherine Trinh, and Arief Suriawinata, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | - Todd MacKenzie
- Lia Harrington, Todd MacKenzie, and Saeed Hassanpour, Geisel School of Medicine at Dartmouth College, Hanover; Roberta diFlorio-Alexander, Katherine Trinh, and Arief Suriawinata, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | - Arief Suriawinata
- Lia Harrington, Todd MacKenzie, and Saeed Hassanpour, Geisel School of Medicine at Dartmouth College, Hanover; Roberta diFlorio-Alexander, Katherine Trinh, and Arief Suriawinata, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | - Saeed Hassanpour
- Lia Harrington, Todd MacKenzie, and Saeed Hassanpour, Geisel School of Medicine at Dartmouth College, Hanover; Roberta diFlorio-Alexander, Katherine Trinh, and Arief Suriawinata, Dartmouth-Hitchcock Medical Center, Lebanon, NH
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14
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Ramkumar N, Suckow BD, Brown JR, Sedrakyan A, MacKenzie T, Stone DH, Cronenwett JL, Goodney PP. Role of Sex in Determining Treatment Type for Patients Undergoing Endovascular Lower Extremity Revascularization. J Am Heart Assoc 2019; 8:e013088. [PMID: 31475624 PMCID: PMC6755836 DOI: 10.1161/jaha.119.013088] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background Limited data exist to describe factors that influence the use of different endovascular treatments for peripheral arterial disease. Therefore, we studied sex differences in the utilization of endovascular treatment modalities and their impact on arterial patency. Methods and Results We analyzed procedures from 2010 to 2016 in the Vascular Quality Initiative for arteries treated with percutaneous transluminal angioplasty (PTA) alone, stenting (with/without PTA), and atherectomy (with/without PTA). We explored sex differences in treatment modality by arterial segment (iliac, femoropopliteal, and tibial) with multivariable logistic regression. We used Kaplan-Meier survival analysis and multivariable Cox regression to study sex differences in arterial reintervention and occlusion. In this cohort, patients (n=58 247, mean age 68 years, 41% women,) had 106 073 arteries treated (median=2 arteries, interquartile range=1-3). Half (50%) of these arteries were treated with stents, 39% with PTA alone, and 11% with atherectomy. After risk adjustment, women were less likely to undergo stenting or atherectomy (versus PTA alone) in the femoropopliteal (stent risk ratio=0.78 [0.74-0.82]; atherectomy risk ratio=0.69 [0.58-0.82]) and tibial arteries (stent risk ratio=0.70 [0.55-0.89]; atherectomy risk ratio=0.87 [0.70-1.07]). In the iliac arteries there was no sex difference in stenting, and atherectomy was rarely used (0.2%). Women underwent reintervention in the femoropopliteal arteries (hazard ratio=1.28 [1.17-1.40]) or developed an occlusion in the iliac (hazard ratio=1.42 [1.12-1.81]) and femoropopliteal arteries (hazard ratio=1.19 [1.06-1.34]) more frequently than men. Conclusions Women were less likely to undergo stenting or atherectomy and had higher rates of occlusion and reintervention, especially in the femoropopliteal arteries. Evidence-based guidelines are needed to guide optimal use of endovascular treatments for men and women.
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Affiliation(s)
- Niveditta Ramkumar
- The Dartmouth Institute for Health Policy and Clinical Practice Lebanon NH
| | - Bjoern D Suckow
- Section of Vascular Surgery Department of Surgery Dartmouth-Hitchcock Medical Center Lebanon NH
| | - Jeremiah R Brown
- The Dartmouth Institute for Health Policy and Clinical Practice Lebanon NH
| | - Art Sedrakyan
- Weill Cornell Medical College Cornell University New York NY
| | - Todd MacKenzie
- The Dartmouth Institute for Health Policy and Clinical Practice Lebanon NH
| | - David H Stone
- Section of Vascular Surgery Department of Surgery Dartmouth-Hitchcock Medical Center Lebanon NH
| | - Jack L Cronenwett
- Section of Vascular Surgery Department of Surgery Dartmouth-Hitchcock Medical Center Lebanon NH
| | - Philip P Goodney
- The Dartmouth Institute for Health Policy and Clinical Practice Lebanon NH.,Section of Vascular Surgery Department of Surgery Dartmouth-Hitchcock Medical Center Lebanon NH
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Kellogg M, Benkert AR, Huang YL, Ahmed B, MacKenzie T, Watkins M, Magnus P, Flynn J, VerLee P, Lucas L, Francis S, Malenka D. NO EVIDENCE OF RURAL CARE DISPARITIES FOR ST-ELEVATION MYOCARDIAL INFARCTION WHEN MEASURED BY IN-HOSPITAL MORTALITY. J Am Coll Cardiol 2019. [DOI: 10.1016/s0735-1097(19)30714-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Emond JA, Longacre MR, Drake KM, Titus LJ, Hendricks K, MacKenzie T, Harris JL, Carroll JE, Cleveland LP, Langeloh G, Dalton MA. Exposure to Child-Directed TV Advertising and Preschoolers' Intake of Advertised Cereals. Am J Prev Med 2019; 56:e35-e43. [PMID: 30573338 PMCID: PMC6340774 DOI: 10.1016/j.amepre.2018.09.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 09/03/2018] [Accepted: 09/04/2018] [Indexed: 10/27/2022]
Abstract
INTRODUCTION Child-directed TV advertising is believed to influence children's diets, yet prospective studies in naturalistic settings are absent. This study examined if child-directed TV advertisement exposure for ten brands of high-sugar breakfast cereals was associated with children's intake of those brands prospectively. METHODS Observational study of 624 preschool-age children and their parents conducted in New Hampshire, 2014-2015. Over 1 year, parents completed a baseline and six online follow-up surveys, one every 8 weeks. Children's exposure to high-sugar breakfast cereal TV advertisements was based on the network-specific TV programs children watched in the 7 days prior to each follow-up assessment, and parents reported children's intake of each advertised high-sugar breakfast cereal brand during that same 7-day period. Data were analyzed in 2017-2018. RESULTS In the fully adjusted Poisson regression model accounting for repeated measures and brand-specific effects, children with high-sugar breakfast cereal advertisement exposure in the past 7 days (i.e., recent exposure; RR=1.34, 95% CI=1.04, 1.72), at any assessment in the past (RR=1.23, 95% CI=1.06, 1.42), or recent and past exposure (RR=1.37, 95% CI=1.15, 1.63) combined had an increased risk of brand-specific high-sugar breakfast cereal intake. Absolute risk difference of children's high-sugar breakfast cereal intake because of high-sugar breakfast cereal TV advertisement exposure varied by brand. CONCLUSIONS This naturalistic study demonstrates that child-directed high-sugar breakfast cereal TV advertising was prospectively associated with brand-specific high-sugar breakfast cereal intake among preschoolers. Findings indicate that child-directed advertising influences begin earlier and last longer than previously demonstrated, highlighting limitations of current industry guidelines regarding the marketing of high-sugar foods to children under age 6 years.
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Affiliation(s)
- Jennifer A Emond
- Department of Biomedical Data Sciences, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Department of Epidemiology, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Department of Pediatrics, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire.
| | - Meghan R Longacre
- Department of Biomedical Data Sciences, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Department of Pediatrics, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Keith M Drake
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Greylock McKinnon Associates, Cambridge, Massachusetts
| | - Linda J Titus
- Department of Epidemiology, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Department of Pediatrics, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Kristy Hendricks
- Department of Pediatrics, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Todd MacKenzie
- Department of Biomedical Data Sciences, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Jennifer L Harris
- Rudd Center for Food Policy and Obesity, University of Connecticut, Storrs, Connecticut
| | - Jennifer E Carroll
- Department of Biomedical Data Sciences, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Lauren P Cleveland
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Pilgrim Health Care Institute, Harvard School of Medicine, Boston, Massachusetts
| | - Gail Langeloh
- Department of Biomedical Data Sciences, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Madeline A Dalton
- Department of Biomedical Data Sciences, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Department of Pediatrics, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
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Taenzer AH, Perreard IM, MacKenzie T, McGrath SP. Characteristics of Desaturation and Respiratory Rate in Postoperative Patients Breathing Room Air Versus Supplemental Oxygen: Are They Different? Anesth Analg 2018; 126:826-832. [PMID: 29293179 DOI: 10.1213/ane.0000000000002765] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Routine monitoring of postoperative patients with pulse oximetry-based surveillance monitoring has been shown to reduce adverse events. However, there is some concern that pulse oximetry is limited in its ability to detect deterioration quickly enough to allow for intervention in patients receiving supplemental oxygen. To address such concerns, this study expands on the current limited knowledge of differences in desaturation and respiratory rate characteristics between patients breathing room air and those receiving supplemental oxygen. METHODS Pulse oximetry-derived data and patient characteristics were used to examine overnight desaturation patterns of 67 postoperative patients who were receiving either supplemental oxygen or breathing room air. The 2 modalities with respect to the speed of desaturation, in addition to magnitude and duration of desaturation events, are compared. Night-time pulse rate, oxygen saturation, respiratory rate, and the transition times from normal oxygen saturation levels to desaturated states are also compared. The behavior of respiratory rate in proximity to desaturation events is described. Statistical methods included multivariable regression and inverse probability of treatment weighted to adjust for any imbalance in patient characteristics between the oxygen and room air patients and linear mixed effect models to account for clustering by patient. RESULTS The study included 33 patients on room air and 34 receiving supplemental oxygen. The speed of desaturation was not different for room air versus oxygen for 2 types of desaturation (adjusted % difference, 95% confidence interval [CI]: type I; 22.4%, -51.5% to 209%; P = .67, type II; -17.3%, -53.8% to 47.6%; P = .52). Patients receiving supplemental oxygen had a higher mean oxygen saturation (adjusted difference, 95% CI, 2.4 [0.7-4.0]; P = .006). No differences were found for the average overnight respiratory or pulse rate, or proportion of time in desaturation states between the 2 groups.The time to transition from a normal oxygen saturation (92%) to 88% or below was not longer for supplemental oxygen patients (P = .42, adjusted difference 26.1%: 95% CI, -28.1% to 121%). Respiratory rates did not differ between the overall mean and desaturation or recovery phases or between the oxygen and room air group. CONCLUSIONS In this study, desaturation characteristics did not differ between patients receiving supplemental oxygen and breathing room air with regard to speed, depth, or duration of desaturation. Transition time for desaturations to reach low oxygen saturation alarms was not different, while respiratory rate remained in the normal range during these events. These findings suggest that pulse oximetry-based surveillance monitoring for deterioration detection can be used equally effectively for patients on supplemental oxygen and for those on room air.
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Affiliation(s)
- Andreas H Taenzer
- From the Department of Anesthesiology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Irina M Perreard
- From the Department of Anesthesiology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Todd MacKenzie
- Department of Biomedical Data Science, Dartmouth College, Hanover, New Hampshire
| | - Susan P McGrath
- From the Department of Anesthesiology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
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Wyler von Ballmoos M, Likosky DS, Rezaee M, Lobdell K, Alam S, Parker D, Owens S, Thiessen-Philbrook H, MacKenzie T, Brown JR. Elevated preoperative Galectin-3 is associated with acute kidney injury after cardiac surgery. BMC Nephrol 2018; 19:280. [PMID: 30342486 PMCID: PMC6195960 DOI: 10.1186/s12882-018-1093-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 10/09/2018] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Previous research suggests that novel biomarkers may be used to identify patients at increased risk of acute kidney injury following cardiac surgery. The purpose of this study was to evaluate the relationship between preoperative levels of circulating Galectin-3 (Gal-3) and acute kidney injury after cardiac surgery. METHODS Preoperative serum Gal-3 was measured in 1498 patients who underwent coronary artery bypass graft (CABG) surgery and/or valve surgery as part of the Northern New England Biomarker Study between 2004 and 2007. Preoperative Gal-3 levels were measured using multiplex assays and grouped into terciles. Univariate and multinomial logistic regression was used to assess the predictive ability of Gal-3 terciles and AKI occurrence and severity. RESULTS Before adjustment, patients in the highest tercile of Gal-3 had a 2.86-greater odds of developing postoperative KDIGO Stage 2 or 3 (p < 0.001) and 1.70-greater odds of developing KDIGO Stage 1 (p = < 0.001), compared to the first tercile. After adjustment, patients in the highest tercile had 2.95-greater odds of developing KDIGO Stage 2 or 3 (p < 0.001) and 1.71-increased odds of developing KDIGO Stage 1 (p = 0.001), compared to the first tercile. Compared to the base model, the addition of Gal-3 terciles improved discriminatory power compared to without Gal-3 terciles (test of equality = 0.042). CONCLUSION Elevated preoperative Gal-3 levels significantly improves predictive ability over existing clinical models for postoperative AKI and may be used to augment risk information for patients at the highest risk of developing AKI and AKI severity after cardiac surgery.
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Affiliation(s)
| | - Donald S. Likosky
- Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor, MI USA
- Section of Health Services Research and Quality, Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI USA
| | - Michael Rezaee
- Section of Urology, Department of Surgery, Dartmouth-Hitchcock Medical Center, Lebanon, NH USA
| | | | - Shama Alam
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH USA
| | - Devin Parker
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH USA
| | - Sherry Owens
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH USA
| | | | - Todd MacKenzie
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH USA
- Department of Biomedical Data Science, HB 7505 Dartmouth-Hitchcock Medical Center, Lebanon, NH NH 03756 USA
| | - Jeremiah R. Brown
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH USA
- Department of Biomedical Data Science, HB 7505 Dartmouth-Hitchcock Medical Center, Lebanon, NH NH 03756 USA
- Department of Epidemiology, Geisel School of Medicine, Lebanon, NH USA
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Lobdell KW, Parker DM, Likosky DS, Rezaee M, Wyler von Ballmoos M, Alam SS, Owens S, Thiessen-Philbrook H, MacKenzie T, Brown JR. Preoperative serum ST2 level predicts acute kidney injury after adult cardiac surgery. J Thorac Cardiovasc Surg 2018; 156:1114-1123.e2. [PMID: 29759735 DOI: 10.1016/j.jtcvs.2018.03.149] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 02/26/2018] [Accepted: 03/05/2018] [Indexed: 01/22/2023]
Abstract
OBJECTIVE The purpose of this study was to evaluate the relationship between preoperative levels of serum soluble ST2 (ST2) and acute kidney injury (AKI) after cardiac surgery. Previous research has shown that biomarkers facilitate the prediction of AKI and other complications after cardiac surgery. METHODS Preoperative ST2 proteins were measured in 1498 patients undergoing isolated coronary artery bypass graft surgery at 8 hospitals participating in the Northern New England Biomarker Study from 2004 to 2007. AKI severity was defined using the Acute Kidney Injury Network (AKIN) definition. Preoperative ST2 levels were measured using multiplex assays. Ordered logistic regression was used to examine the relationship between ST2 levels and levels of AKI severity. RESULTS Participants in this study showed a significant association between elevated preoperative ST2 levels and acute kidney risk. Before adjustment, the odds of patients developing AKIN stage 2 or 3, compared with AKIN stage 1, are 2.43 times higher (95% confidence interval, 1.86-3.16; P < .001) for patients in the highest tercile of preoperative ST2. After adjustment, patients in the highest tercile of preoperative ST2 had significantly greater odds of developing AKIN stage 2 or 3 AKI (odds ratio, 1.99; 95% confidence interval, 1.50-2.65; P < .001) compared with patients with AKIN stage 1. CONCLUSIONS Preoperative ST2 levels are associated with postoperative AKI risk and can be used to identify patients at higher risk of developing AKI after cardiac surgery.
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Affiliation(s)
| | - Devin M Parker
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH; Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | - Donald S Likosky
- Institute for Healthcare Policy and Innovation; Section of Health Services Research and Quality, Department of Cardiac Surgery, University of Michigan, Ann Arbor, Mich
| | - Michael Rezaee
- Section of Urology, Department of Surgery, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | | | - Shama S Alam
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH; Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | - Sherry Owens
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH; Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | - Heather Thiessen-Philbrook
- Program of Applied Translational Research, Section of Nephrology, Department of Medicine, Yale University School of Medicine, New Haven, Conn
| | - Todd MacKenzie
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH; Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH
| | - Jeremiah R Brown
- The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH; Department of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH; Department of Community and Family Medicine, Geisel School of Medicine, Lebanon, NH.
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diFlorio Alexander RM, Haider SJ, MacKenzie T, Goodrich ME, Weiss J, Onega T. Correlation between obesity and fat-infiltrated axillary lymph nodes visualized on mammography. Br J Radiol 2018; 91:20170110. [PMID: 29144164 DOI: 10.1259/bjr.20170110] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
OBJECTIVE Using screening mammography, this study investigated the association between obesity and axillary lymph node (LN) size and morphology. METHODS We conducted a retrospective review of 188 females who underwent screening mammography at an academic medical centre. Length and width of the LN and hilum were measured in the largest, mammographically visible axillary node. The hilo-cortical ratio (HCR) was calculated as the hilar width divided by the cortical width. Measurements were performed by a board certified breast radiologist and a resident radiology physician. Inter-rater agreement was assessed with Pearson correlation coefficient. We performed multivariable regression analysis for associations of LN measurements with body mass index (BMI), breast density and age. RESULTS There was a strong association between BMI and LN dimensions, hilum dimensions and HCR (p < 0.001 for all metrics). There was no significant change in cortex width with increasing BMI (p = 0.15). Increases in LN length and width were found with increasing BMI [0.6 mm increase in length per unit BMI, 95% CI (0.4-0.8), p < 0.001 and0.3 mm increase in width per unit BMI, 95% CI(0.2-0.4), p < 0.001, respectively]. Inter-rater reliability for lymph node and hilum measurements was 0.57-0.72. CONCLUSION We found a highly significant association between increasing BMI and axillary LN dimensions independent of age and breast density with strong interobserver agreement. The increase in LN size was driven by expansion of the LN hilum secondary to fat infiltration. Advances in knowledge: This preliminary work determined a relationship between fat infiltrated axillary lymph nodes and obesity.
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Affiliation(s)
| | - Steffen J Haider
- 2 Department of Radiology, New York Presbyterian Hospital/Columbia University Medical Center , New York, NY , USA
| | - Todd MacKenzie
- 2 Department of Radiology, New York Presbyterian Hospital/Columbia University Medical Center , New York, NY , USA
| | - Martha E Goodrich
- 3 Department of Biomedical Data Science, The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine at Dartmouth One Medical Center Drive , Lebanon, NH , USA
| | - Julie Weiss
- 3 Department of Biomedical Data Science, The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine at Dartmouth One Medical Center Drive , Lebanon, NH , USA
| | - Tracy Onega
- 3 Department of Biomedical Data Science, The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine at Dartmouth One Medical Center Drive , Lebanon, NH , USA
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Abstract
e18227 Background: Streptococcus pneumoniae remains a leading cause of serious illness, including bacteremia, meningitis, and pneumonia among adults in the United States. Approximately 10% of all patients with invasive pneumococcal disease die of their illness, but case-fatality rates are higher for immunocompromised adults including cancer patients. Current Center for Disease Control (CDC) guidelines recommend routine use of 13-valent (Prevnar 13) and 23-valent (Pneumovax 23) pneumococcal vaccines (PV) for immunocompromised patients. We conducted a quality improvement (QI) project utilizing our electronic medical record (EMR) system to improve PV compliance (PVC) rates in our patients. Methods: We created automatic reminders called best practice alerts (BPA) and linked them to a smart order set within our EMR that appeared upon opening patient charts. The smart set ordered the correct vaccine in sequence based on CDC guidelines. From August 2015- January 2017, we implemented this BPA for one of six hematology providers and the remaining providers were provided with verbal guidelines and reminders to administer PV to their patients. Results: At baseline only 22% of 3000 hematology patients within the practice had received PV. The pilot provider with the BPA linked to a smart order set within the EMR improved PVC within his patients from 23% to 66%. Providers who were just given verbal guidelines improved PVC from an average of 22% to 45%. The difference in the improvement between the pilot provider and the reference group is 21% (p < 0.001). Conclusions: In an EMR era, we took advantage of the tools within our system to improve PVC rates. BPA linked to a smart order set within the EMR provided better means of improving PVC than verbal prompts in high-risk immunocompromised patients. Additionally, the increase in PVC throughout the hematology practice is due to primary care providers using similar reminders within the same EMR. The PV BPA will be conducted as a standard of care in our clinic and will be expanded to oncology patients as well.
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Bekelis K, Missios S, MacKenzie T, Tjoumakaris S, Jabbour P. Abstract WP2: Anesthesia Technique and Outcomes of Mechanical Thrombectomy in Patients With Acute Ischemic Stroke. Stroke 2017. [DOI: 10.1161/str.48.suppl_1.wp2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
The impact of anesthesia technique on the outcomes of mechanical thrombectomy for acute ischemic stroke remains an issue of debate, and has not been studied in clinical trials. We investigated the association of general anesthesia with outcomes in patients undergoing mechanical thrombectomy for ischemic stroke.
Methods:
We performed a cohort study involving patients undergoing mechanical thrombectomy for ischemic stroke from 2009-2013, who were registered in the New York Statewide Planning and Research Cooperative System (SPARCS) database. An instrumental variable (hospital rate of general anesthesia) analysis was used to simulate the effects of randomization and investigate the association of anesthesia technique with case-fatality and length of stay (LOS).
Results:
Of the 1,308 patients undergoing mechanical thrombectomy for acute ischemic stroke, 492 (37.6%) underwent general anesthesia, and 816 (62.4%) underwent conscious sedation. Employing an instrumental variable analysis, we identified that general anesthesia was associated with a 6.4% increased case-fatality (95% CI, 1.9% to 11.0%), and 8.4 days longer LOS (95% CI, 2.9 to 14.0) in comparison to conscious sedation. This corresponded to 15 patients needing to be treated with conscious sedation to prevent one death. Our results were robust in a sensitivity analysis utilizing mixed effects regression, and propensity score adjusted regression models.
Conclusions:
Using a comprehensive all-payer cohort of acute ischemic stroke patients undergoing mechanical thrombectomy in New York State, we identified an association of general anesthesia with increased case fatality and LOS. These considerations should be taken into account when standardizing acute stroke care.
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Affiliation(s)
- Kimon Bekelis
- Neurosurgery, Dartmouth-Hitchcock Med Cntr, Lebanon, NH
| | | | - Todd MacKenzie
- Statistics, The Dartmouth Institute for Health Policy and Clinical Practice, Lebanon, NH
| | | | - Pascal Jabbour
- Neurosurgery, Thomas Jefferson Univ Hosp, Philadelphia, PA
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Bekelis K, Gottlieb D, MacKenzie T, Lanzino G, Lawton MT, Tjoumakaris SI, Jabbour P. 101 Medicare Expenditures for Elderly Patients Undergoing Surgical Clipping or Endovascular Intervention for Subarachnoid Hemorrhage. Neurosurgery 2016. [DOI: 10.1227/01.neu.0000489643.42010.88] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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MacKenzie T, Schwartz G, Wells W, Sempere L. Abstract A67: Stromal expression of microRNA-21 identifies high-risk group in triple negative breast cancer. Cancer Res 2015. [DOI: 10.1158/1538-7445.chtme14-a67] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction: Triple negative breast cancer (TNBC) is an aggressive subtype defined by lack of ER, PR and HER2 expression. There are few specific prognostic markers and no effective targeted therapies for TNBC. microRNA diagnostics is an emerging area of novel biomarkers in cancer medicine. Expression of tumor promoting miR-21 is frequently altered in BC. Since tumor lesions are a complex mixture of different cell types, we hypothesized that analysis of miR-21 expression at single cell resolution could provide more accurate information to assess risk of disease recurrence and BC-related death.
Experimental procedure: We implemented a fully-automated tissue slide-based staining assay in a CLIA-certified environment to detect miR-21 expression in a cohort of 988 BC patients, whose tumors were represented in the NCI CDP Stage I/II Prognostic tissue microarrays. 901 cases provided adequate tissue to determine levels and cellular compartment (cancer vs. stroma) of miR-21 expression.
Results: The miR-21High group had a shorter recurrence-free (RFS; HR=1.71, p<0.001) and BC-specific (CSS; HR=1.96, p<0.001) survival in multivariate regression analyses, adjusted for standard clinicopathologic characteristics. Subdivision of the miR-21High group by cellular compartment of expression revealed that cancer cell-specific expression in ER+ and/or PR+ HER2- cases (HR=3.67, p=0.006 for RFS; HR=5.13, p=0.002 for CSS) and stromal cell expression in ER-PR-HER2- cases ( HR=2.59, p=0.013 for RFS; HR=3.37, p=0.003 for CSS) were associated with very poor clinical outcome.
Conclusions: These findings indicate that levels and cellular compartment of miR-21 expression provide clinically-relevant information in different intrinsic molecular BC subtypes. Importantly, miR-21 expression is predominantly upregulated in the stroma and not cancer cells. This suggests a regulatory role of miR-21 in cellular elements of the tumor microenvironment, including tumor-associated fibroblasts. miR-21 could become a useful functional biomarker to further refine individual risk and offer a new therapeutic avenue to improve management of TNBC.
Citation Format: Todd MacKenzie, Gary Schwartz, Wendy Wells, Lorenzo Sempere. Stromal expression of microRNA-21 identifies high-risk group in triple negative breast cancer. [abstract]. In: Abstracts: AACR Special Conference on Cellular Heterogeneity in the Tumor Microenvironment; 2014 Feb 26-Mar 1; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2015;75(1 Suppl):Abstract nr A67. doi:10.1158/1538-7445.CHTME14-A67
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Affiliation(s)
| | | | - Wendy Wells
- 1Dartmouth-Hitchcock Medical Center, Lebanon, NH,
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25
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MacKenzie T, Gifford AH, Sabadosa KA, Quinton HB, Knapp EA, Goss CH, Marshall BC. Longevity of patients with cystic fibrosis in 2000 to 2010 and beyond: survival analysis of the Cystic Fibrosis Foundation patient registry. Ann Intern Med 2014; 161:233-41. [PMID: 25133359 PMCID: PMC4687404 DOI: 10.7326/m13-0636] [Citation(s) in RCA: 235] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Advances in treatments for cystic fibrosis (CF) continue to extend survival. An updated estimate of survival is needed for better prognostication and to anticipate evolving adult care needs. OBJECTIVE To characterize trends in CF survival between 2000 and 2010 and to project survival for children born and diagnosed with the disease in 2010. DESIGN Registry-based study. SETTING 110 Cystic Fibrosis Foundation-accredited care centers in the United States. PATIENTS All patients represented in the Cystic Fibrosis Foundation Patient Registry (CFFPR) between 2000 and 2010. MEASUREMENTS Survival was modeled with respect to age, age at diagnosis, gender, race or ethnicity, F508del mutation status, and symptoms at diagnosis. RESULTS Between 2000 and 2010, the number of patients in the CFFPR increased from 21,000 to 26,000, median age increased from 14.3 to 16.7 years, and adjusted mortality decreased by 1.8% per year (95% CI, 0.5% to 2.7%). Males had a 19% (CI, 13% to 24%) lower adjusted risk for death than females. Median survival of children born and diagnosed with CF in 2010 is projected to be 37 years (CI, 35 to 39 years) for females and 40 years (CI, 39 to 42 years) for males if mortality remains at 2010 levels and more than 50 years if mortality continues to decrease at the rate observed between 2000 and 2010. LIMITATIONS The CFFPR does not include all patients with CF in the United States, and loss to follow-up and missing data were observed. Additional analyses to address these limitations suggest that the survival projections are conservative. CONCLUSION Children born and diagnosed with CF in the United States in 2010 are expected to live longer than those born earlier. This has important implications for prognostic discussions and suggests that the health care system should anticipate greater numbers of adults with CF. PRIMARY FUNDING SOURCE Cystic Fibrosis Foundation.
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Bakari M, Wamsele J, MacKenzie T, Maro I, Kimario J, Ali S, Dowla S, Hendricks K, Lukmanji Z, Neke NM, Waddell R, Matee M, Pallangyo K, von Reyn CF. Nutritional status of HIV-infected women with tuberculosis in Dar es Salaam, Tanzania. Public Health Action 2013; 3:224-9. [PMID: 26393034 DOI: 10.5588/pha.13.0028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Accepted: 08/14/2013] [Indexed: 11/10/2022] Open
Abstract
SETTING Tuberculosis (TB) treatment clinics in Dar es Salaam, Tanzania. OBJECTIVE To quantify anthropometrics and intake of en-ergy and protein among human immunodeficiency virus (HIV) positive women with TB. DESIGN HIV-positive women with newly diagnosed TB were assessed on their anthropometric characteristics and dietary intake. Energy and protein intake were determined using Tanzania food composition tables and compared with standard recommendations. Patients were re-evaluated after 4-6 months of anti-tuberculosis treatment. RESULTS Among 43 women, the baseline median CD4 count was 209 cells/µl (range 8-721); 19 (44%) had a CD4 count of <200; 20 (47%) were on antiretroviral therapy. Body mass index was <18.5 kg/m(2) in 25 (58%); the median food insecurity score was 6. The median level of kcal/day was 1693 (range 1290-2633) compared to an estimated need of 2658; the median deficit was 875 kcal (range -65-1278). The median level of protein/day was 42 g (range 27-67) compared to 77 g estimated need; the median protein deficit was 35 g (range 10-50). The median weight gain among 29 patients after 4-6 months was 6 kg. CONCLUSION HIV-positive women with TB have substantial 24-h deficits in energy and protein intake, report significant food insecurity and gain minimal weight on anti-tuberculosis treatment. Enhanced dietary education together with daily supplementation of 1000 kcal with 40 g protein may be required.
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Affiliation(s)
- M Bakari
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - J Wamsele
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - T MacKenzie
- Geisel School of Medicine at Dartmouth and Dartmouth-Hitchcock Medical Center, Hanover, New Hampshire, USA
| | - I Maro
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - J Kimario
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - S Ali
- Geisel School of Medicine at Dartmouth and Dartmouth-Hitchcock Medical Center, Hanover, New Hampshire, USA
| | - S Dowla
- Geisel School of Medicine at Dartmouth and Dartmouth-Hitchcock Medical Center, Hanover, New Hampshire, USA
| | - K Hendricks
- Geisel School of Medicine at Dartmouth and Dartmouth-Hitchcock Medical Center, Hanover, New Hampshire, USA
| | - Z Lukmanji
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - N M Neke
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - R Waddell
- Geisel School of Medicine at Dartmouth and Dartmouth-Hitchcock Medical Center, Hanover, New Hampshire, USA
| | - M Matee
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - K Pallangyo
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - C F von Reyn
- Geisel School of Medicine at Dartmouth and Dartmouth-Hitchcock Medical Center, Hanover, New Hampshire, USA
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Lahey T, Czechura T, Crabtree S, Arbeit RD, Matee M, Horsburgh CR, MacKenzie T, Bakari M, Pallangyo K, von Reyn CF. Greater preexisting interferon γ responses to mycobacterial antigens and lower bacillary load during HIV-associated tuberculosis. J Infect Dis 2013; 208:1629-33. [PMID: 23908490 DOI: 10.1093/infdis/jit396] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The role of preexisting interferon (IFN) γ responses in controlling bacillary burden in human immunodeficiency virus (HIV)-associated tuberculosis is not known. Among BCG-immunized HIV-infected adults who developed tuberculosis in a phase III trial of an investigational tuberculosis vaccine, greater baseline IFN-γ responses to early secretory antigenic target 6 and Mycobacterium tuberculosis whole-cell lysate were associated with reduced bacillary burden on sputum smear grade, days to culture positivity on agar, and sputum culture grade during subsequent tuberculosis. This association was most consistent among recipients of the investigational vaccine. When HIV-associated tuberculosis develops, greater preexisting IFN-γ responses to mycobacterial antigens are associated with reduced tuberculosis bacillary burden. ClinicalTrials.gov Identifier. NCT0052195.
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Drake KM, Beach ML, Longacre MR, MacKenzie T, Titus LJ, Rundle AG, Dalton MA. Influence of sports, physical education, and active commuting to school on adolescent weight status. Pediatrics 2012; 130:e296-304. [PMID: 22802608 PMCID: PMC3408684 DOI: 10.1542/peds.2011-2898] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE To compare the associations between weight status and different forms of physical activity among adolescents. METHODS We conducted telephone surveys with 1718 New Hampshire and Vermont high school students and their parents as part of a longitudinal study of adolescent health. We surveyed adolescents about their team sports participation, other extracurricular physical activity, active commuting, physical education, recreational activity for fun, screen time, diet quality, and demographics. Overweight/obesity (BMI for age ≥ 85th percentile) and obesity (BMI for age ≥ 95 percentile) were based on self-reported height and weight. RESULTS Overall, 29.0% (n = 498) of the sample was overweight/obese and 13.0% (n = 223) were obese. After adjustments, sports team participation was inversely related to overweight/obesity (relative risk [RR] = 0.73 [95% confidence interval (CI): 0.61, 0.87] for >2 sports teams versus 0) and obesity (RR = 0.61 [95% CI: 0.45, 0.81] for >2 sports teams versus 0). Additionally, active commuting to school was inversely related to obesity (RR = 0.67 [95% CI: 0.45, 0.99] for >3.5 days per week versus 0). Attributable risk estimates suggest obesity prevalence would decrease by 26.1% (95% CI: 9.4%, 42.8%) if all adolescents played on 2 sports teams per year and by 22.1% (95% CI: 0.1%, 43.3%) if all adolescents walked/biked to school at least 4 days per week. CONCLUSIONS Team sport participation had the strongest and most consistent inverse association with weight status. Active commuting to school may reduce the risk of obesity, but not necessarily overweight, and should be studied further. Obesity prevention programs should consider strategies to increase team sport participation among all students.
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Affiliation(s)
- Keith M. Drake
- Hood Center for Children and Families,,Center for Education, The Dartmouth Institute for Health Policy and Clinical Practice, Lebanon, New Hampshire
| | - Michael L. Beach
- Hood Center for Children and Families,,Departments of Community and Family Medicine, and,Departments of Anesthesiology, and
| | - Meghan R. Longacre
- Hood Center for Children and Families,,Pediatrics, The Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire
| | - Todd MacKenzie
- Hood Center for Children and Families,,Departments of Community and Family Medicine, and,Statistics, Dartmouth–Hitchcock Medical Center, Lebanon, New Hampshire; and
| | - Linda J. Titus
- Hood Center for Children and Families,,Departments of Community and Family Medicine, and,Pediatrics, The Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire
| | - Andrew G. Rundle
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York
| | - Madeline A. Dalton
- Hood Center for Children and Families,,Departments of Community and Family Medicine, and,Pediatrics, The Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire
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Morden NE, Lai Z, Goodrich DE, MacKenzie T, McCarthy JF, Austin K, Welsh DE, Bartels S, Kilbourne AM. Eight-year trends of cardiometabolic morbidity and mortality in patients with schizophrenia. Gen Hosp Psychiatry 2012; 34:368-79. [PMID: 22516216 PMCID: PMC3383866 DOI: 10.1016/j.genhosppsych.2012.02.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 02/15/2012] [Accepted: 02/17/2012] [Indexed: 11/15/2022]
Abstract
OBJECTIVE We examined cardiometabolic disease and mortality over 8 years among individuals with and without schizophrenia. METHOD We compared 65,362 patients in the Veteran Affairs (VA) health system with schizophrenia to 65,362 VA patients without serious mental illness (non-SMI) matched on age, service access year and location. The annual prevalence of diagnosed cardiovascular disease, diabetes, dyslipidemia, hypertension, obesity, and all-cause and cause-specific mortality was compared for fiscal years 2000-2007. Mean years of potential life lost (YPLLs) were calculated annually. RESULTS The cohort was mostly male (88%) with a mean age of 54 years. Cardiometabolic disease prevalence increased in both groups, with non-SMI patients having higher disease prevalence in most years. Annual between-group differences ranged from <1% to 6%. Annual mortality was stable over time for schizophrenia (3.1%) and non-SMI patients (2.6%). Annual mean YPLLs increased from 12.8 to 15.4 in schizophrenia and from 11.8 to 14.0 for non-SMI groups. CONCLUSIONS VA patients with and without schizophrenia show increasing but similar prevalence rates of cardiometabolic diseases. YPLLs were high in both groups and only slightly higher among patients with schizophrenia. The findings highlight the complex population served by the VA while suggesting a smaller mortality impact from schizophrenia than previously reported.
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Affiliation(s)
- Nancy E. Morden
- Dartmouth Medical School, Department of Community and Family Medicine,; Hanover, NH, USA
- The Dartmouth Institute for Health Policy and Clinical Practice; Lebanon, NH, USA
- VA White River Junction Rural Health Resource Center – Eastern Region, White River Junction, VT, USA
| | - Zongshan Lai
- VA Ann Arbor Center for Clinical Management Research Ann Arbor, MI, USA
- University of Michigan Medical School, Department of Psychiatry; Ann Arbor, MI, USA
| | - David E. Goodrich
- VA Ann Arbor Center for Clinical Management Research Ann Arbor, MI, USA
- University of Michigan Medical School, Department of Psychiatry; Ann Arbor, MI, USA
| | - Todd MacKenzie
- Dartmouth Medical School, Department of Community and Family Medicine,; Hanover, NH, USA
- The Dartmouth Institute for Health Policy and Clinical Practice; Lebanon, NH, USA
- VA White River Junction Rural Health Resource Center – Eastern Region, White River Junction, VT, USA
| | - John F. McCarthy
- VA Ann Arbor Center for Clinical Management Research Ann Arbor, MI, USA
- University of Michigan Medical School, Department of Psychiatry; Ann Arbor, MI, USA
| | - Karen Austin
- VA Ann Arbor Center for Clinical Management Research Ann Arbor, MI, USA
- University of Michigan Medical School, Department of Psychiatry; Ann Arbor, MI, USA
| | - Deborah E. Welsh
- VA Ann Arbor Center for Clinical Management Research Ann Arbor, MI, USA
- University of Michigan Medical School, Department of Psychiatry; Ann Arbor, MI, USA
| | - Stephen Bartels
- Dartmouth Medical School, Department of Community and Family Medicine,; Hanover, NH, USA
- Dartmouth Medical School, Department of Psychiatry; Hanover, NH, USA
| | - Amy M. Kilbourne
- VA Ann Arbor Center for Clinical Management Research Ann Arbor, MI, USA
- University of Michigan Medical School, Department of Psychiatry; Ann Arbor, MI, USA
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Lahey T, Mitchell BK, Arbeit RD, Sheth S, Matee M, Horsburgh CR, MacKenzie T, Mtei L, Bakari M, Vuola JM, Pallangyo K, von Reyn CF. Polyantigenic interferon-γ responses are associated with protection from TB among HIV-infected adults with childhood BCG immunization. PLoS One 2011; 6:e22074. [PMID: 21799772 PMCID: PMC3140474 DOI: 10.1371/journal.pone.0022074] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Accepted: 06/14/2011] [Indexed: 11/19/2022] Open
Abstract
Background Surrogate immunologic markers for natural and vaccine-mediated protection against tuberculosis (TB) have not been identified. Methods HIV-infected adults with childhood BCG immunization entering the placebo arm of the DarDar TB vaccine trial in Dar es Salaam, Tanzania, were assessed for interferon gamma (IFN-γ) responses to three mycobacterial antigen preparations – secreted Mycobacterium tuberculosis antigens 85 (Ag85), early secretory antigenic target 6 (ESAT-6) and polyantigenic whole cell lysate (WCL). We investigated the association between the number of detectable IFN-γ responses at baseline and the subsequent risk of HIV-associated TB. Results During a median follow-up of 3.3 years, 92 (9.4%) of 979 placebo recipients developed TB. The incidence of TB was 14% in subjects with no detectable baseline IFN-γ responses vs. 8% in subjects with response to polyantigenic WCL (P = 0.028). Concomitant responses to secreted antigens were associated with further reduction in the incidence of HIV-associated TB. Overall the percentage of subjects with 0, 1, 2 and 3 baseline IFN-γ responses to mycobacterial preparations who developed HIV-associated TB was 14%, 8%, 7% and 4%, respectively (P = 0.004). In a multivariate Cox regression model, the hazard of developing HIV-associated TB was 46% lower with each increment in the number of detectable baseline IFN-γ responses (P<0.001). Conclusions Among HIV-infected adults who received BCG in childhood and live in a TB-endemic country, polyantigenic IFN-γ responses are associated with decreased risk of subsequent HIV-associated TB. Trial Registration ClinicalTrials.gov NCT0052195
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Affiliation(s)
- Timothy Lahey
- Dartmouth Medical School, Lebanon, New Hampshire, United States of America.
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Stitham J, Arehart E, Elderon L, Gleim SR, Douville K, Kasza Z, Fetalvero K, MacKenzie T, Robb J, Martin KA, Hwa J. Comprehensive biochemical analysis of rare prostacyclin receptor variants: study of association of signaling with coronary artery obstruction. J Biol Chem 2010; 286:7060-9. [PMID: 21189259 DOI: 10.1074/jbc.m110.124933] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Currently, pharmacogenetic studies are at an impasse as the low prevalence (<2%) of most variants hinder their pharmacogenetic analysis with population sizes often inadequate for sufficiently powered studies. Grouping rare mutations by functional phenotype rather than mutation site can potentially increase sample size. Using human population-based studies (n = 1,761) to search for dysfunctional human prostacyclin receptor (hIP) variants, we recently discovered 18 non-synonymous mutations, all with frequencies less than 2% in our study cohort. Eight of the 18 had defects in binding, activation, and/or protein stability/folding. Mutations (M113T, L104R, and R279C) in three highly conserved positions demonstrated severe misfolding manifested by impaired binding and activation of cell surface receptors. To assess for association with coronary artery disease, we performed a case-control study comparing coronary angiographic results from patients with reduced cAMP production arising from the non-synonymous mutations (n = 23) with patients with non-synonymous mutations that had no reduction in cAMP (n = 17). Major coronary artery obstruction was significantly increased in the dysfunctional mutation group in comparison with the silent mutations. We then compared the 23 dysfunctional receptor patients with 69 age- and risk factor-matched controls (1:3). This verified the significantly increased coronary disease in the non-synonymous dysfunctional variant cohort. This study demonstrates the potential utility of in vitro functional characterization in predicting clinical phenotypes and represents the most comprehensive characterization of human prostacyclin receptor genetic variants to date.
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Affiliation(s)
- Jeremiah Stitham
- Department of Pharmacology and Toxicology, Dartmouth Medical School, Hanover, New Hampshire 03755, USA
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MacKenzie T, Zens MS, Ferrara A, Schned A, Karagas MR. Diabetes and risk of bladder cancer: evidence from a case-control study in New England. Cancer 2010; 117:1552-6. [PMID: 21425156 DOI: 10.1002/cncr.25641] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2010] [Revised: 06/10/2010] [Accepted: 06/22/2010] [Indexed: 11/11/2022]
Abstract
BACKGROUND Diabetes is an emerging public health issue in the US, affecting 11% of Americans over the age of 20, with long-term complications that include cardiovascular disease, retinopathy, neuropathy, and nephropathy. A recent meta-analysis found that bladder cancer incidence was approximately 40% higher in individuals with diabetes; however, few studies considered duration or type of therapy and had limited adjustment for potentially confounding factors. METHODS To further investigate the potential role of diabetes in risk of bladder cancer, the authors analyzed data from a case-control study conducted in New Hampshire in which patients with bladder cancer, and controls sampled from the population, completed an interview regarding history of diabetes, cigarette smoking history, height, weight, and history of urinary tract infections. RESULTS The study consisted of 331 cases and 263 controls on whom information regarding diabetes was ascertained. History of diabetes was related to an increased bladder cancer risk (adjusted odds ratio = 2.2, 95% CI, 1.3 to 3.8). The association was strongest in those who had diabetes for the longest duration (OR for 16 or more years = 3.6, 1.1 to 11.2) and in those taking oral hypoglycemic medications (OR = 3.3, 1.5 to 7.1). CONCLUSIONS Our findings support an association between bladder cancer incidence and diabetes, and further suggest that the risk may be greater among patients taking oral hypoglycemics and those with diabetes of longer duration.
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Affiliation(s)
- Todd MacKenzie
- Department of Medicine, Dartmouth Medical School, Hanover, New Hampshire 037756, USA.
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Maro I, Lahey T, MacKenzie T, Mtei L, Bakari M, Matee M, Pallangyo K, von Reyn CF. Low BMI and falling BMI predict HIV-associated tuberculosis: a prospective study in Tanzania. Int J Tuberc Lung Dis 2010; 14:1447-1453. [PMID: 20937186 PMCID: PMC3068293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023] Open
Abstract
BACKGROUND Low body mass index (BMI) is a known risk factor for tuberculosis (TB) in people without human immunodeficiency virus (HIV), but there are no prospective studies linking BMI to the risk of HIV-associated TB. DESIGN In HIV-infected adults with CD4 counts ≥ 200 cells/μl receiving placebo in a TB booster vaccine trial in Dar es Salaam, Tanzania, we measured BMI at baseline and Year 1, and related baseline BMI and change in BMI to the risk of developing TB. RESULTS We documented 92 cases of TB among 979 subjects followed for a mean of 3.2 years. Compared to subjects who did not develop TB, subjects who developed TB had a lower baseline BMI (23.2 vs. 24.6 kg/m(2), P = 0.006), and a greater BMI decline from baseline to Year 1 (-0.4 vs. 0.6 kg/m(2), P < 0.001). In multivariate analyses, baseline BMI was associated with the risk of developing TB (hazard ratio [HR] per kg/m(2) 0.94, 95%CI 0.90-0.99, P = 0.028), as was the change in BMI from baseline to Year 1 (HR per kg/m(2) 0.79, 95%CI 0.71-0.87, P < 0.001). Subjects with a baseline BMI < 17 kg/m(2) were more likely to develop TB (HR 3.72, 95%CI 1.16-12.0, P = 0.028). CONCLUSION Low and falling BMI predict HIV-associated TB.
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Affiliation(s)
- I Maro
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
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Onega T, MacKenzie T, Weiss J, Goodrich M, Titus-Ernstoff L. Screening mammography intervals among postmenopausal hormone therapy users and nonusers. Cancer Causes Control 2009; 21:147-52. [PMID: 19844798 DOI: 10.1007/s10552-009-9444-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2009] [Accepted: 09/29/2009] [Indexed: 11/30/2022]
Abstract
BACKGROUND The recent decline in US breast cancer incidence rates has been attributed to the marked reduction in use of postmenopausal hormone therapy (HT). An alternative explanation is that women who are not routinely seeking medical care to renew HT prescriptions may be less adherent to recommendations for mammographic screening. To investigate the latter possibility, we compared mammographic intervals according to HT use. METHODS Using data (1995-2007) from the New Hampshire Mammography Network (NHMN), a state-based mammography registry, we assessed mammographic intervals corresponding to HT use or nonuse among postmenopausal women. We used linear mixed effects models to assess whether the length of screening mammogram intervals differed according to HT use. RESULTS A total of 310,185 mammograms, representing 76,192 postmenopausal women and 319,353 person-years of screening, were included in the analysis. The median screening interval corresponding to HT use overall was 13.0 months (interquartile range: 12.4-15.1) and for nonuse was 13.1 (interquartile range: 12.4-15.8). Virtually, all screening mammograms occurred within a 2-year interval regardless of HT use or nonuse (98.5 and 98.1%, respectively). CONCLUSIONS Our findings indicate that screening mammography intervals are similar whether or not women are using HT. Thus, reduced utilization of screening mammography is unlikely to account for the decrease in breast cancer incidence seen soon after the WHI report.
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Affiliation(s)
- Tracy Onega
- Department of Community and Family Medicine, Dartmouth Medical School, Hanover, NH, USA.
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Zug KA, Aaron DM, MacKenzie T. Baseline Quality of Life As Measured by Skindex-16+5 in Patients Presenting to a Referral Center for Patch Testing. Dermatitis 2009. [DOI: 10.2310/6620.2008.08020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Arehart E, Stitham J, Asselbergs FW, Douville K, MacKenzie T, Fetalvero KM, Gleim S, Kasza Z, Rao Y, Martel L, Segel S, Robb J, Kaplan A, Simons M, Powell RJ, Moore JH, Rimm EB, Martin KA, Hwa J. Acceleration of cardiovascular disease by a dysfunctional prostacyclin receptor mutation: potential implications for cyclooxygenase-2 inhibition. Circ Res 2008; 102:986-93. [PMID: 18323528 DOI: 10.1161/circresaha.107.165936] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Recent increased adverse cardiovascular events observed with selective cyclooxygenase-2 inhibition led to the withdrawal of rofecoxib (Vioxx) and valdecoxib (Bextra), but the mechanisms underlying these atherothrombotic events remain unclear. Prostacyclin is the major end product of cyclooxygenase-2 in vascular endothelium. Using a naturally occurring mutation in the prostacyclin receptor, we report for the first time that a deficiency in prostacyclin signaling through its G protein-coupled receptor contributes to atherothrombosis in human patients. We report that a prostacyclin receptor variant (R212C) is defective in adenylyl cyclase activation in both patient blood and in an in vitro COS-1 overexpression system. This promotes increased platelet aggregation, a hallmark of atherothrombosis. Our analysis of patients in 3 separate white cohorts reveals that this dysfunctional receptor is not likely an initiating factor in cardiovascular disease but that it accelerates the course of disease in those patients with the greatest risk factors. R212C was associated with cardiovascular disease only in the high cardiovascular risk cohort (n=980), with no association in the low-risk cohort (n=2293). In those at highest cardiovascular risk, both disease severity and adverse cardiovascular events were significantly increased with R212C when compared with age- and risk factor-matched normal allele patients. We conclude that for haploinsufficient mutants, such as the R212C, the enhanced atherothrombotic phenotype is likely dependent on the presence of existing atherosclerosis or injury (high risk factors), analogous to what has been observed in the cyclooxygenase-2 inhibition studies or prostacyclin receptor knockout mice studies. Combining both biochemical and clinical approaches, we conclude that diminished prostacyclin receptor signaling may contribute, in part, to the underlying adverse cardiovascular outcomes observed with cyclooxygenase-2 inhibition.
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Affiliation(s)
- Eric Arehart
- Department of Pharmacology & Toxicology, Dartmouth-Hitchcock Medical Center, Hanover, NH 03755, USA
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Schalock PC, Zug KA, Carter JC, Dhar D, MacKenzie T. Efficacy and Patient Perception of Grenz Ray Therapy in the Treatment of Dermatoses Refractory to Other Medical Therapy. Dermatitis 2008. [DOI: 10.2310/6620.2007.06057] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Schalock PC, Zug KA, Carter JC, Dhar D, MacKenzie T. Efficacy and patient perception of Grenz ray therapy in the treatment of dermatoses refractory to other medical therapy. Dermatitis 2008; 19:90-94. [PMID: 18413110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
BACKGROUND Grenz ray therapy (GRT) has been used to treat dermatoses refractory to other therapy. Patient's assessments to GRT alone have not been previously reported. OBJECTIVE (1) To report the patterns of use of GRT at our center over a 10-year period and evaluate the efficacy of GRT in treating recalcitrant skin conditions, (2) to evaluate patient perceptions about GRT, and (3) to evaluate whether patients felt this form of treatment was worthwhile. METHOD Cross-sectional survey by mailed questionnaire to patients treated with GRT from 1990 to 2001. RESULTS Of 351 patients treated with GRT from 1990 to 2001, 98 (28%) returned the questionnaire; 64% reported decreased severity or clearing of disease (p = .003), and 63% reported decreased or no discomfort (p = .006) 3 months following treatment. Overall, 54% said GRT was worthwhile, and 53% would choose it again; 40% reported mild side effects. Number of treatments (p = .2) or total dose (p = .25) were not significantly different among responders to GRT and nonresponders to GRT. In a subgroup of treated patients with a diagnosis of contact dermatitis (94% with hand dermatitis), 64% felt GRT was worthwhile and 77% indicated that they would choose this therapy again if needed. CONCLUSIONS Many patients treated with GRT for recalcitrant dermatitis reported that this treatment was an effective therapy in decreasing the discomfort and severity of their skin condition. Overall, just more than half of treated patients believed GRT was a worthwhile therapy that they would use again.
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Affiliation(s)
- Peter C Schalock
- Department of Dermatology, Massachusetts General Hospital, Harvard School of Medicine, Boston, MA, USA
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MacKenzie T, Comi R, Sluss P, Keisari R, Manwar S, Kim J, Larson R, Baron JA. Metabolic and hormonal effects of caffeine: randomized, double-blind, placebo-controlled crossover trial. Metabolism 2007; 56:1694-8. [PMID: 17998023 DOI: 10.1016/j.metabol.2007.07.013] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2007] [Accepted: 07/16/2007] [Indexed: 11/28/2022]
Abstract
In short-term studies, caffeine has been shown to increase insulin levels, reduce insulin sensitivity, and increase cortisol levels. However, epidemiological studies have indicated that long-term consumption of beverages containing caffeine such as coffee and green tea is associated with a reduced risk of type 2 diabetes mellitus. There is a paucity of randomized studies addressing the metabolic and hormonal effects of consuming caffeine over periods of more than 1 day. We evaluated the effect of oral intake of 200 mg of caffeine taken twice a day for 7 days on glucose metabolism, as well as on serum cortisol, dehydroepiandrosterone (DHEA), and androstenedione, and on nighttime salivary melatonin. A double-blind, randomized, placebo-controlled crossover study with periods of 7 days and washouts of 5 days comparing caffeine with placebo capsules was conducted. Participants were 16 healthy adults aged 18 to 22 years with a history of caffeine consumption. Blood samples from each subject were assayed for glucose, insulin, serum cortisol, DHEA, and androstenedione on the eighth day of each period after an overnight fast. Nighttime salivary melatonin was also measured. Insulin levels were significantly higher (by 1.80 microU/mL; 95% confidence interval, 0.33-3.28) after caffeine intake than after placebo. The homeostasis model assessment index of insulin sensitivity was reduced by 35% (95% confidence interval, 7%-62%) by caffeine. There were no differences in glucose, DHEA, androstenedione, and melatonin between treatment periods. This study provides evidence that daily caffeine intake reduces insulin sensitivity; the effect persists for at least a week and is evident up to 12 hours after administration.
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Affiliation(s)
- Todd MacKenzie
- Department of Medicine, Dartmouth Medical School, Hanover, NH 03755, USA.
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Roback MG, Wathen JE, MacKenzie T, Bajaj L. In reply. Ann Emerg Med 2007. [DOI: 10.1016/j.annemergmed.2006.11.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Stitham J, Arehart EJ, Gleim S, Douville K, MacKenzie T, Hwa J. Arginine (CGC) codon targeting in the human prostacyclin receptor gene (PTGIR) and G-protein coupled receptors (GPCR). Gene 2007; 396:180-7. [PMID: 17481829 PMCID: PMC2016789 DOI: 10.1016/j.gene.2007.03.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2006] [Revised: 03/19/2007] [Accepted: 03/22/2007] [Indexed: 11/23/2022]
Abstract
The human prostacyclin receptor (hIP) has recently been recognized as an important seven transmembrane G-protein coupled receptor that plays critical roles in atheroprevention and cardioprotection. To date, four non-synonymous genetic variants have been identified, two of which occur at the same Arg amino acid position (R212H, R212C). This observation instigated further genetic screening for prostacyclin receptor variants on 1455 human genomic samples. A total of 31 distinct genetic variants were detected, with 6 (19%) involving Arg residues. Distinct differences in location and frequencies of genetic variants were noted between Caucasian, Asian, Hispanic and African Americans, with the most changes noted in the Asian cohort. From the sequencing results, three Arg-targeted changes at the same 212 position within the third cytoplasmic loop of the human prostacyclin (hIP) receptor were detected: 1) R212C (CGC-->TGC), 2) R212H (CGC-->CAC), and 3) R212R (CGC-->CGT). Three additional Arg codon variants (all exhibiting the same CGC to TGC change) were also detected, R77C, R215C, and R279C. Analysis (GPCR and SNP databases) of 200 other GPCRs, with recorded non-synonymous mutations, confirmed a high frequency of Arg-targeted missense mutations, particularly within the important cytoplasmic domain. Preferential nucleotide changes (at Arg codons), were observed involving cytosine (C) to thymine (T) (pyrimidine to pyrimidine), as well as guanine (G) to adenine (A) (purine to purine) (p<0.001, Pearson's goodness-of-fit test). Such targeting of Arg residues, leading to significant changes in coding amino acid size and/or charge, may have potentially-important structural and evolutionary implications on the hIP and GPCRs in general. In the case of the human prostacyclin receptor, such alterations may reduce the cardio-, vasculo-, and cytoprotective effects of prostacyclin.
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MESH Headings
- Amino Acid Sequence
- Arginine/genetics
- Base Sequence
- Codon/genetics
- Cytoplasm/metabolism
- Databases, Genetic
- Genome, Human/genetics
- Humans
- Molecular Sequence Data
- Nucleotides
- Polymorphism, Single Nucleotide/genetics
- Protein Structure, Secondary
- Protein Structure, Tertiary
- Receptors, Epoprostenol
- Receptors, G-Protein-Coupled/genetics
- Receptors, Prostaglandin/chemistry
- Receptors, Prostaglandin/genetics
- Sequence Analysis, DNA
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Affiliation(s)
- Jeremiah Stitham
- Department of Pharmacology and Toxicology, Dartmouth Medical School, Hanover, NH 03755, USA
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Carney PA, Steiner E, Goodrich ME, Dietrich AJ, Kasales CJ, Weiss JE, MacKenzie T. Discovery of breast cancers within 1 year of a normal screening mammogram: how are they found? Ann Fam Med 2006; 4:512-8. [PMID: 17148629 PMCID: PMC1687155 DOI: 10.1370/afm.580] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
PURPOSE We sought to determine how breast cancers that occur within 1 year after a normal mammogram are discovered. METHODS Using population-based mammography registry data from 2000-2002, we identified 143 women with interval breast cancers and 481 women with screen-detected breast cancers. We surveyed women's primary care clinicians to assess how the interval breast cancers were found and factors associated with their discovery. RESULTS Women with interval cancers were twice as likely to have a personal history of breast cancer (30.1%) as women with screen-detected cancers (13.6%). Among women with interval cancers, one half of the invasive tumors (49.5%) were discovered when women initiated a health care visit because of a breast concern, and 16.8% were discovered when a clinician found an area of concern while conducting a routine clinical breast examination. Having a lump and both a personal and a family history of breast cancer was the most common reason why women initiated a health care visit (44%) (P <.01). CONCLUSIONS Women with interval cancers are most likely to initiate a visit to a primary care clinician when they have 2 or more breast concerns. These concerns are most likely to include having a lump and a personal and/or family history of breast cancer. Women at highest risk for breast cancer may need closer surveillance by their primary care clinicians and may benefit from a strong educational message to come for a visit as soon as they find a lump.
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Affiliation(s)
- Patricia A Carney
- Department of Community & Family Medicine, Dartmouth Medical School, Lebanon, NH, USA.
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Gao D, Grunwald GK, Rumsfeld JS, Schooley L, MacKenzie T, Shroyer ALW. Time-varying risk factors for long-term mortality after coronary artery bypass graft surgery. Ann Thorac Surg 2006; 81:793-9. [PMID: 16488675 DOI: 10.1016/j.athoracsur.2005.08.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2005] [Revised: 07/26/2005] [Accepted: 08/15/2005] [Indexed: 11/17/2022]
Abstract
BACKGROUND There is a substantial literature on short-term mortality risk factors for coronary artery bypass graft (CABG) surgery. However, very few studies have examined risk factors for long-term mortality. METHODS We analyzed 56,543 veterans who underwent CABG surgery at one of 43 VA cardiac surgery centers between October 1, 1991, and March 30, 2001. Each patient was followed for a minimum of 3.5 months and a maximum of 9.5 years for mortality assessment. The time-varying effects of 22 mortality preoperative risk factors were evaluated using both standard Cox regression models and Cox B-spline regression models. RESULTS Six variables showed significant varying effects over time on mortality after surgery. The effects of previous heart surgery or preoperative intra-aortic balloon pump carried about 5 times and 3 times the risk, respectively, of dying on the first day after surgery, but were not significant during long-term follow-up. Conversely, diabetes had little additional risk immediately after surgery, but the risk increased steadily and doubled at 9.5 years after surgery. Three other risk variables--age, chronic obstructive pulmonary disease, and urgent or emergent status--also had risk changing by 50% to 60% over the next decade. Most of the other 16 risk variables were significantly associated with mortality, but the risk did not vary substantially over time. CONCLUSIONS Risk associated with some preoperative variables can change significantly during the decade after surgery, and risk assessments that assume constant risk during the postoperative period may substantially overestimate or underestimate risk at some times. These findings may help clinicians identify appropriate management strategies for patients during the years after CABG surgery, and support an emphasis on noncardiac comorbidities during later postoperative periods.
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Affiliation(s)
- Dexiang Gao
- Department of Veterans Affairs Medical Center, Denver, Colorado 80220, USA
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Roback MG, Wathen JE, MacKenzie T, Bajaj L. A randomized, controlled trial of i.v. versus i.m. ketamine for sedation of pediatric patients receiving emergency department orthopedic procedures. Ann Emerg Med 2006; 48:605-12. [PMID: 17052563 DOI: 10.1016/j.annemergmed.2006.06.001] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2005] [Revised: 05/04/2006] [Accepted: 05/11/2006] [Indexed: 11/27/2022]
Abstract
STUDY OBJECTIVE We compare adverse events, efficacy, and length of sedation of intravenous (i.v.) versus intramuscular (i.m.) ketamine procedural sedation and analgesia for orthopedic procedures in the emergency department (ED). METHODS Pediatric patients receiving ketamine for orthopedic procedures were enrolled in a prospective, randomized, controlled trial in a children's hospital ED. All patients were initially randomized to receive ketamine either 1 mg/kg i.v. or 4 mg/kg i.m. Demographics, adverse events, sedation efficacy, and length of sedation were recorded. RESULTS Two hundred twenty-five patients were randomized (116 i.v., 109 i.m.). Two hundred eight patients, aged 14 months to 15 years, completed the study, 109 i.v. and 99 i.m. Respiratory adverse events were similar between groups (i.v. 8.3% versus i.m. 4.0%; odds ratio [OR] 0.47; 95% confidence interval [CI] 0.14 to 1.6). Vomiting in the ED was more common in the i.m. group (26.3% versus 11.9%; OR 2.60; 95% CI 1.2 to 5.9). Using the Faces Pain Scale, patients in the i.m. group reported significantly less pain from the procedure. Video observers reported significantly lower distress in the i.m. group during the painful procedure (Observation Score of Behavioral Distress scores 0.35 i.m. versus 0.74 i.v.; mean difference 0.38; 95% CI 0.04 to 0.72). Length of sedation was significantly longer in the i.m. group (median 129 versus 80 minutes). Satisfaction of sedation was high in parents and physicians, with no difference in reported satisfaction between groups. This study was terminated early because of nursing resistance based on the longer recovery times observed in patients receiving ketamine i.m. CONCLUSION In this study of pediatric sedation for orthopedic procedures, we found that ketamine 4 mg/kg i.m. was more effective than 1 mg/kg i.v. but demonstrated significantly longer recovery times and more vomiting.
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Affiliation(s)
- Mark G Roback
- Department of Pediatrics, Section of Emergency Medicine, University of Colorado School of Medicine, The Children's Hospital, Denver, CO 80218, USA.
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Abstract
BACKGROUND Some epidemiologic and laboratory studies have suggested that total joint arthroplasty could increase the risk of cancer. In this meta-analysis, we attempt to clarify the association of joint arthroplasty with subsequent cancer incidence. METHODS We identified population-based studies reporting standardized incidence ratios (SIR) for cancer following large joint arthroplasty. After summing the observed and expected numbers of cases across all qualifying studies, we calculated SIRs for all cancers, and for those at 28 anatomic sites. Latency analysis involving 175,166 patients characterized short-term and long-term cancer associations. RESULTS The analyses included 1,435,356 person-years of follow-up and 20,045 cases of cancer. Overall cancer risk among patients with arthroplasty was equal to that for the general population. The relative risk of lung cancer, reduced in the first 5 years after arthroplasty, increased significantly over time to approach that of the general population. Risks for all sites in the luminal gastrointestinal tract were significantly reduced by 10% to 20%; with relative risks that were generally stable over time. Increased risks were seen for cancer of the prostate (SIR, 1.12; 95% confidence interval, 1.08-1.16); similar relative risks were seen in each time period after the procedure. For melanoma, relative risks increased with follow-up to a SIR of 1.43 (95% confidence interval, 1.13-1.79) for 10 or more years after arthroplasty. There was a similar delayed emergence of increased risks for cancers of the urinary tract and oropharynx. The relative risk for bone cancer decreased with time after the procedure. CONCLUSIONS There does not seem to be an overall increased risk of cancer following total joint arthroplasty. Although the risks of prostate cancer and melanoma seem to be elevated, there is no obvious mechanism for these associations. Reductions in risk for some malignancies may not be causal.
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Affiliation(s)
- Tracy Onega
- Department of Medicine, Dartmouth Medical School, Evergreen Center, Suite 300, 46 Centerra Parkway, Lebanon, NH 03756, USA
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46
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Liu E, MacKenzie T, Dobyns EL, Parikh CR, Karrer FM, Narkewicz MR, Sokol RJ. Characterization of acute liver failure and development of a continuous risk of death staging system in children. J Hepatol 2006; 44:134-41. [PMID: 16169116 DOI: 10.1016/j.jhep.2005.06.021] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2004] [Revised: 06/17/2005] [Accepted: 06/20/2005] [Indexed: 12/04/2022]
Abstract
BACKGROUND/AIMS Acute liver failure (ALF) in children has been associated with an overall mortality of approximately 70% in the pretransplant era and 50-80% survival in those undergoing orthotopic liver transplantation. There is currently no system for staging severity of ALF in children. The aim of this study was to characterize pediatric ALF in a tertiary hospital and to derive a scoring system to stratify severity of ALF based on predicted mortality. METHODS Prospective data collection of 81 children from December 1993-2003 who presented with ALF. Data recorded included peak laboratory values, clinical characteristics, and survival. RESULTS Transplant-free survival was 56% with overall survival including those undergoing OLT of 72%. Transplantation rate was 22% with transplant survival of 72%. Of the peak laboratory values analyzed, total bilirubin, prothrombin time/INR, and ammonia were the most predictive of death or a need for liver transplant. A simple risk staging system was developed based on the ability of these three laboratory measurements to predict mortality. CONCLUSIONS The survival in pediatric ALF has improved in recent years. Risk staging for ALF could potentially be used in clinical research for risk-adjusted outcomes analysis and to help stratify patients for clinical studies according to mortality risk.
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Affiliation(s)
- Edwin Liu
- Section of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, The Children's Hospital and University of Colorado Health Sciences Center, 1056 East 19th Avenue, Box B290, Denver, CO 80218-1088, USA
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47
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Wathen JE, MacKenzie T, Bothner JP. Usefulness of the serum electrolyte panel in the management of pediatric dehydration treated with intravenously administered fluids. Pediatrics 2004; 114:1227-34. [PMID: 15520100 DOI: 10.1542/peds.2004-0457] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND The serum electrolyte panel (SEP) is a frequently ordered laboratory test, but it has unproven usefulness in the treatment of dehydrated pediatric patients. Our study purpose was to evaluate the usefulness of routinely ordering a SEP in the treatment of dehydrated pediatric patients receiving intravenous fluids (IVFs). METHODS Children 2 months to 9 years of age who were receiving IVFs because of dehydration were prospectively studied in a pediatric emergency department (PED). Historical data, physical examination findings, degree of dehydration, and SEP results were recorded. After patient evaluation, attending physicians documented whether they would have ordered a SEP. Outcome measurements included changes in clinical management on the basis of SEP results, as well as correlations of dispositions and unscheduled return visits (URVs) with SEP results. RESULTS A total of 182 patients were enrolled in the study. One hundred eleven patients had mild dehydration, 55 moderate dehydration, and 16 severe dehydration. Eighty-eight patients (48%; 95% confidence interval: 41-56%) had > or =1 abnormal SEP value. Clinically relevant findings included bicarbonate levels of <16 mmol/L for 28% of patients, hypoglycemia for 9.9%, hypokalemia for 6.0%, and hypernatremia for 3.0%. The attending physicians predicted that a SEP would be clinically important for 34% of all patients. There was a 58% sensitivity in detecting which children would have clinically significant SEP results. Overall, SEP results changed clinical management in 10.4% of cases. One hundred sixty-five (91%) of the patients were discharged from the PED (including 48 who were initially observed), of whom 7 (3.8%) had URVs to the PED within 72 hours and were given additional IVFs. Seventeen patients were admitted (median: 2.6 days), 2 of whom had URVs after hospital discharge for additional IVFs. CONCLUSIONS On the basis of initial presentation, attending physicians were poor at predicting which children would have clinically significant SEP results. Low bicarbonate values were correlated with observation unit use but not with hospitalization or URVs. The observation unit provided effective care for a subset of dehydrated patients, avoiding the need for hospitalization. Obtaining a SEP can provide useful information for the treatment of some children receiving IVFs because of dehydration.
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Affiliation(s)
- Joe E Wathen
- Department of Pediatrics, Section of Emergency Medicine, University of Colorado Health Sciences Center/Children's Hospital, Denver, Colorado, USA.
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48
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Abstract
OBJECTIVE To test the hypothesis that there is an improved response to interferon in children with chronic hepatitis B (HBV) who are < or =5 years of age. STUDY DESIGN Retrospective chart review of 22 consecutive children with chronic HBV (ages 17 months to 17 years; median, 83.9 months; 14 male, 8 female) treated with interferon-alpha2b. RESULTS Ten patients (48%) responded to treatment [HBeAg (-), Anti-HBe (+), HBV DNA (-), HBsAg (+) and normal alanine aminotransferase/aspartate aminotransferase (ALT/AST) at 6 months after treatment], and 5 seroconverted HBsAg [above plus HBsAg negative and anti-HBs (+)]. Seven of 9 patients (78%) < or =5 years of age responded (5 cleared HBsAg). Three of 13 patients (23%) >5 years of age responded. Patient age at treatment was significantly lower in responders (63 +/- 70 months) versus nonresponders (104 +/- 55 months, P =.005). AST, ALT, and HBV DNA at the start of treatment were not different between responders and nonresponders or between patients < or =5 and >5 years old. CONCLUSIONS Interferon treatment may be more effective in younger children with chronic hepatitis B.
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Affiliation(s)
- Gregory E Kobak
- Pediatric Liver Center and Section of Pediatric Gastroenterology, University of Colorado Health Sciences Center, Denver, CO, USA
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Hokanson JE, MacKenzie T, Kinney G, Snell-Bergeon JK, Dabelea D, Ehrlich J, Eckel RH, Rewers M. Evaluating Changes in Coronary Artery Calcium: An Analytic Method That Accounts for Interscan Variability. AJR Am J Roentgenol 2004; 182:1327-32. [PMID: 15100140 DOI: 10.2214/ajr.182.5.1821327] [Citation(s) in RCA: 163] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE Coronary calcium measured by electron beam CT is associated with coronary disease and can be used to predict coronary disease events. Studies investigating changes in coronary calcium need to address interscan variability as it relates to the overall coronary calcium score in defining progression or regression of coronary calcium over time. SUBJECTS AND METHODS. Electron beam CT was performed on 1,074 participants. Coronary calcium volume scores were repeated 5 min apart. Interscan variability was examined using Bland-Altman plots and homogeneity tests. Transformations of the Box-Cox family (including power, roots, and logarithm) were applied to calcium volume scores. The transformation that stabilized the variation in calcium volume scores was applied to progression of calcium volume scores in 109 subjects with diabetes. RESULTS The variability in calcium volume score increased as the level of coronary calcium increased (rho = 0.67, p < 0.001 for the relation between the absolute difference and the mean value of calcium volume scores). This heterogeneity was removed using the square root transformation of the calcium volume score (rho = 0.09, p < 0.15 for the relation between the absolute difference in the square root of the calcium volume score and the mean square root of the calcium volume score). This transformation was applied to calcium volume scores taken a mean of 2.7 years apart in 109 subjects with diabetes. A significant change in calcium volume score was defined as a difference between the square root-transformed to calcium volume scores greater than or equal to 2.5 mm(3) (> 99th percentile of interscan variability). Significant progression was observed in 10% of the subjects. The square root of the calcium volume score corrected for the bias in progression of calcium volume because of the level of coronary calcium. CONCLUSION Using the square root of the calcium volume score stabilized interscan variability across the range of coronary calcium. Defining change in coronary calcium as greater than or equal to 2.5 mm(3) of the difference in the square root-transformed calcium volume scores provided an estimate that was unbiased with respect to baseline coronary calcium. This analytic technique may facilitate investigations of the relevance of changes in coronary calcium to clinical outcomes and the use of changes in coronary calcium as a measure of the therapeutic impact on subclinical disease in clinical trials.
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Affiliation(s)
- John E Hokanson
- Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, 4200 E Ninth Ave, B 119, Denver, CO 80262, USA.
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50
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Snell-Bergeon JK, Hokanson JE, Jensen L, MacKenzie T, Kinney G, Dabelea D, Eckel RH, Ehrlich J, Garg S, Rewers M. Progression of coronary artery calcification in type 1 diabetes: the importance of glycemic control. Diabetes Care 2003; 26:2923-8. [PMID: 14514603 DOI: 10.2337/diacare.26.10.2923] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Coronary artery disease (CAD) occurs earlier in life and is more often fatal in people with type 1 diabetes. This excess risk seems to be higher than in those with type 2 diabetes and is poorly explained by conventional risk factors. The role of glycemic control is controversial and has not been previously addressed in a prospective manner using a reliable marker for subclinical CAD, such as coronary artery calcification (CAC), measured by electron beam computed tomography (EBCT). RESEARCH DESIGN AND METHODS We measured CAC twice during an interval of 2.7 years in 109 men and women with type 1 diabetes (aged 22-50 years). Progression of CAC was found in 21 patients, based on change in the square root-transformed volume score. RESULTS In multiple logistic regression, CAC progression was associated with baseline hyperglycemia (odds ratio [OR] 7.11, 95% CI 1.38-36.6, P = 0.02), adjusted for the presence of CAC at baseline (P = 0.01), duration of diabetes (P = 0.02), sex (P = 0.09), and age (P = 0.27). There was also a significant interactive effect of higher insulin dose and higher BMI (P = 0.03). CONCLUSIONS In conclusion, in this young cohort with type 1 diabetes, suboptimal glycemic control (HbA(1c) >7.5%) was a strong risk factor for progression of CAC. Insulin resistance may also play a role.
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Affiliation(s)
- Janet K Snell-Bergeon
- Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, Denver, Colorado 80262, USA.
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