Diffusion of excellence: evaluating a system to identify, replicate, and spread promising innovative practices across the Veterans health administration

Introduction

The Veterans Health Administration (VHA) Diffusion of Excellence (DoE) program provides a system to identify, replicate, and spread promising practices across the largest integrated healthcare system in the United States. DoE identifies innovations that have been successfully implemented in the VHA through a Shark Tank style competition. VHA facility and regional directors bid resources needed to replicate promising practices. Winning facilities/regions receive external facilitation to aid in replication/implementation over the course of a year. DoE staff then support diffusion of successful practices across the nationwide VHA.

Methods

Organized around the Reach, Effectiveness, Adoption, Implementation, and Maintenance (RE-AIM) Framework, we summarize results of an ongoing long-term mixed-methods implementation evaluation of DoE. Data sources include: Shark Tank application and bid details, tracking practice adoptions through a Diffusion Marketplace, characteristics of VHA facilities, focus groups with Shark Tank bidders, structured observations of DoE events, surveys of DoE program participants, and semi-structured interviews of national VHA program office leaders, VHA healthcare system/facility executives, practice developers, implementation teams and facilitators.

Results

In the first eight Shark Tanks (2016-2022), 3,280 Shark Tank applications were submitted; 88 were designated DoE Promising Practices (i.e., practices receive facilitated replication). DoE has effectively spread practices across the VHA, with 1,440 documented instances of adoption/replication of practices across the VHA. This includes 180 adoptions/replications in facilities located in rural areas. Leadership decisions to adopt innovations are often based on big picture considerations such as constituency support and linkage to organizational goals. DoE Promising Practices that have the greatest national spread have been successfully replicated at new sites during the facilitated replication process, have close partnerships with VHA national program offices, and tend to be less expensive to implement. Two indicators of sustainment indicate that 56 of the 88 Promising Practices are still being diffused across the VHA; 56% of facilities originally replicating the practices have sustained them, even up to 6 years after the first Shark Tank.

Conclusion

DoE has developed a sustainable process for the identification, replication, and spread of promising practices as part of a learning health system committed to providing equitable access to high quality care.

Are Geriatrics-Focused Primary Care Clinics Better at Diagnosing Dementia Than Traditional Clinics? A Matched Cohort Study

BACKGROUND

Dementia and mild cognitive impairment (MCI) are prevalent but underdiagnosed.

OBJECTIVE

To compare new dementia/MCI diagnosis rates in geriatrics-focused primary care clinics and traditional primary care clinics.

DESIGN

Secondary analysis of a prospective matched cohort study that spanned 2017-2021.

PARTICIPANTS

Community-dwelling Veterans over 65 receiving primary care in a geriatrics-focused medical home (GeriPACT) or traditional primary care home (PACT) at one of 57 Veterans Affairs sites. We excluded individuals with a documented diagnosis of dementia or MCI in the year prior to enrollment.

MAIN MEASURES

Diagnoses obtained from EHR. Cognitive status was assessed using modified Telephone Interview for Cognitive Status (mTICS) tool.

KEY RESULTS

The 470 participants included in this analysis were predominantly white, non-Hispanic males with an average age of 80.3 years. 9.4% of participants received a diagnosis of dementia/MCI after 24 months: 11.5% in GeriPACT and 7.2% in PACT. Adjusted OR for dementia/MCI diagnosis based on GeriPACT exposure was 1.47 (95% CI 0.65-3.29). Low mTICS score (≤ 27) (OR 4.89, 95% CI 2.36-10.13) and marital status (married/partnered) (OR 1.89, CI 0.99-3.59) were independent predictors of dementia/MCI diagnosis. When stratified by cognitive status: diagnosis rates were 20.8% in GeriPACT and 16.7% in PACT among those who scored lower on the cognitive assessment (mTICS ≤ 27); 7.4% in GeriPACT and 3.6% in PACT among those who scored higher (mTICS > 27). The OR for new dementia/MCI diagnosis in GeriPACT was 1.19 (95% CI 0.49-2.91) among those with a low mTICS score and 1.85 (95% CI 0.70-4.88) among those with a higher mTICS score.

CONCLUSIONS

Observed rates of new dementia/MCI diagnosis were higher in GeriPACT, but with considerable uncertainty around estimates. Geriatrics-focused primary care clinics may be a promising avenue for improving the detection of dementia in older adults, but further larger studies are needed to confirm this relationship.

The Veterans Health Administration (VHA) Innovators Network: Evaluation design, methods and lessons learned through an embedded research approach

BACKGROUND

Collaboration between researchers, implementers and policymakers improves uptake of health systems research. In 2018, researchers and VHA Innovators Network (iNET) leadership used an embedded research model to conduct an evaluation of iNET. We describe our evaluation design, early results, and lessons learned.

METHODS

This mixed-methods evaluation incorporated primary data collection via electronic survey, descriptive analysis using existing VA datasets (examining associations between facility characteristics and iNET participation), and qualitative interviews to support real-time program implementation and to probe perceived impacts, benefits and challenges of participation.

RESULTS

We developed reporting tools and collected data regarding site participation, providing iNET leadership rapid access to needed information on projects (e.g., target populations reached, milestones achieved, and barriers encountered). Secondary data analyses indicated iNET membership was greater among larger, more complex VA facilities. Of the 37 iNET member sites, over half (n = 22) did not have any of the six major types of VA research centers; thus iNET is supporting VA sites not traditionally served by research innovation pathways. Qualitative findings highlighted enhanced engagement and perceived value of social and informational networks.

CONCLUSIONS

Working alongside our iNET partners, we supported and influenced iNET's development through our embedded evaluation's preliminary findings. We also provided training and guidance aimed at building capacity among iNET participants.

IMPLICATIONS

Embedded research can yield successful collaborative efforts between researchers and partners. An embedded research team can help programs pivot to ensure effective use of limited resources. Such models inform program development and expansion, supporting strategic planning and demonstrating value.

Family Caregivers of Veterans Experience High Burden, Mental Health Distress, and Financial Strain

We describe the caregiving experiences and needs of family caregivers of older Veterans enrolled in the U.S. Department of Veterans Affairs (VA). We conducted telephone surveys with 1,509 caregivers to assess caregiver health and well-being. Caregivers were primarily female, <50 years old, white, and the Veterans’ spouse. Veterans had substantial functional limitations and required care for multiple conditions, commonly, mental illness, dementia, and heart disease. On average, caregivers provided care for 9.6 hours per day and 6.7 days per week. Burden and depressive symptoms were above clinical thresholds with average scores of 21.8 (Zarit burden) and 11.5 (CES-D 10). Levels of perceived loneliness and financial strain were high. As this population needs emotional support, respite care services, social engagement, and training to care for aging Veterans, the expansion of enhanced caregiver services and supports to this population (expected in 2020) through the VA Mission Act of 2018 will be beneficial.

Merging Implementation Practice and Science to Scale Up Promising Practices: The Veterans Health Administration (VHA) Diffusion of Excellence (DoE) Program

INTRODUCTION

The Veterans Health Administration (VHA) Diffusion of Excellence (DoE) program developed and manages a framework for identification, replication, and diffusion of promising practices throughout the nation's largest integrated health care system. DoE identifies promising practices through a "Shark Tank" competition with winning bidders receiving external implementation facilitation. DoE further supports diffusion of successful practices across the VHA.

METHODS

This article presents results of a mixed methods implementation evaluation of DoE, focusing on program reach, program participation and decisions to adopt innovative practices, implementation processes, and practice sustainment. Data sources include practice adoption metrics, focus groups with bidders (two focus groups), observations of DoE events (seven events), surveys of stakeholders (five separate surveys), and semistructured interviews of facility directors, practice developers, implementation teams, and facilitators (133 participants).

RESULTS

In the first four Shark Tank cohorts (2016-2018), 1,676 practices were submitted; 47 were designated Gold Status Practices (practices with facilitated implementation). Motivation for participation varied. Generally, staff led projects targeting problems they felt passionate about, facility directors focused on big-picture quality metrics and getting middle manager support, and frontline staff displayed variable motivation to implement new projects. Approximately half of facilitated implementation efforts were successful; barriers included insufficient infrastructure, staff, and resources. At the facility level, 73.3% of facilities originating or receiving facilitated implementation support have maintained the practice. VHA-wide, 834 decisions to adopt these practices were made.

CONCLUSION

DoE has resulted in the identification of many candidate practices, promoted adoption of promising practices by facility directors, and supported practice implementation and diffusion across the VHA.

Comprehensive Family Caregiver Support and Caregiver Well-Being: Preliminary Evidence From a Pre-post-survey Study With a Non-equivalent Control Group

Introduction: In May 2010, the Caregivers and Veterans Omnibus Health Services Act of 2010, was signed into law in the United States, establishing the Program of Comprehensive Assistance for Family Caregivers (PCAFC) provided through the VA Caregiver Support Program (CSP). Prior to this program, over half of family caregivers reported being untrained for the tasks they needed to provide. The training through PCAFC represents the largest effort to train family caregivers in the U.S., and the features of the program, specifically a monthly stipend to caregivers and access to a Caregiver Support Coordinator at each VA medical center nationally, make it the most comprehensive caregiver support program ever enacted in the U.S. Methods: The purpose of this study is to examine the association between PCAFC participation and caregiver well-being following enrollment, comparing participating PCAFC caregivers to caregivers who applied to but were not approved for PCAFC participation (non-participants). Well-being is defined using three diverse but related outcomes: depressive symptoms, perceived financial strain, and perceived quality of the Veteran's health care. Additional well-being measures also examined include the Zarit Burden Inventory and positive aspects of caregiving. Results: The survey sample comprised of 92 caregivers approved for PCAFC and 66 caregivers not approved. The mean age of responding caregivers was 45; over 90% of caregivers were female; and over 80% of caregivers were married in both groups. We find promising trends in well-being associated with PCAFC participation. First, the perception of financial strain declined among participants compared to non-participants. Second, while depressive symptoms did not improve for the PCAFC caregivers, depressive symptoms increased among non-participants. Third, perceived quality of the Veteran's VA healthcare was no different between participants and non-participants. However, the 158 returned surveys reflect only a 5% response rate; hence this evidence is preliminary. Conclusion: Despite cautioning that results be interpreted as preliminary, this study provides unique descriptive information about young caregivers of U.S. post-9/11 Veterans, and offers a first step in filling the evidence gap about how comprehensive caregiver support in the U.S. may affect caregiver well-being. These preliminary findings should be explored and validated in a larger sample.

Connecting Caregivers to Support: Lessons Learned From the VA Caregiver Support Program

Development and evaluation of supportive caregiver interventions has become a national priority. This study's aim was to evaluate how caregivers participating in the Department of Veterans Affairs (VA) Caregiver Support Program (CSP) use and value supportive services. Qualitative semi-structured interviews (N = 50 caregivers) were the core of a mixed-methods design, and surveys (N = 160) were supplemental. Caregivers who had used CSP services valued emotional, functional, and health care navigational support, calling support groups and the program coordinator their "lifeline." However, many described a lack of connection with the program-not knowing about or successfully engaging in program services-and needed more information about available resources. Caregivers in rural areas or caring for individuals with specific diseases reported needing tailored services to meet their unique needs. Policy makers and practitioners should proactively promote supportive services for caregivers. Future research should explore strategies for reducing barriers to accessing tailored support to meet the needs of a diverse caregiver population.

Cardiovascular disease-related chronic conditions among Veterans Affairs colorectal cancer survivors: A matched case-control analysis

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Background: The growing number of colorectal cancer (CRC) survivors often have multiple chronic conditions. Comparing CRC survivors and matched non-cancer controls, our objectives were to determine the odds of CRC survivors being diagnosed with CVD-related chronic conditions and their likelihood of control during the year after CRC diagnosis. Methods: We retrospectively identified patients diagnosed with non-metastatic CRC in the Veterans Affairs (VA) healthcare system from fiscal years 2009-2012 and matched each with up to 3 non-cancer control patients. We used logistic regression to assess differences in the likelihood of being diagnosed with CVD-related chronic conditions and control between CRC survivors and non-cancer controls. Results: We identified 9,758 CRC patients and matched them to 29,066 non-cancer controls. At baseline, 69.4% of CRC survivors and their matched controls were diagnosed with hypertension, 52.4% with hyperlipidemia, and 36.7% with diabetes. Compared to matched non-cancer controls, CRC survivors had 57% higher odds of being diagnosed with hypertension (OR = 1.57, 95% CI = 1.49-1.64) and 12% higher odds of poor blood pressure control (OR = 1.12, 95% CI 1.06-1.18) in the subsequent year. Compared to matched non-cancer control patients, CRC survivors had half the odds of being diagnosed with hyperlipidemia (OR = 0.50, 95% CI = 0.48-0.52) and higher odds of LDL control (OR 1.14, 95% CI 1.06-1.23). There were no significant differences between groups for diabetes diagnoses or control. Conclusions: Compared to non-cancer controls, CRC survivors have: 1) greater likelihood of being diagnosed with hypertension and worse blood pressure control in the year following diagnosis; 2) lower likelihood of being diagnosed with hyperlipidemia or LDL control; and 3) comparable diabetes diagnoses and control. There may be a need for hypertension control interventions targeting cancer survivors.

Development and Initial Validation of the Caregiver Perceptions About Communication With Clinical Team Members (CAPACITY) Measure

Despite the important role that family caregivers play managing the care of persons with complex health needs, little is known about how caregivers perceive themselves to be recognized and valued by health care professionals. Our objective was to develop and validate a novel measure, the CAregiver Perceptions About CommunIcation with Clinical Team members (CAPACITY) instrument. Questions focus on perceived quality of communication with the health care team and the extent to which caregivers believe that the health care team considers their capacity and preferences in decision making. A confirmatory factor analysis supported a two-factor solution addressing communication and capacity. Internal consistency reliability was .90 for the communication domain and .93 for the capacity domain. Correlations between these two subscales and individual difference measures provided evidence of convergent and discriminant validity. The CAPACITY instrument may be a useful performance measure that quantifies the extent to which caregivers' experience person- and family-centered health care.

Colorectal Cancer Statistics From the Veterans Affairs Central Cancer Registry

BACKGROUND

Colorectal cancer (CRC) is a common and potentially deadly disease. Although the United States has robust cancer data reporting, information from the Department of Veterans Affairs (VA) healthcare system has often been underrepresented in national cancer data sources. We describe veterans with incident CRC in terms of their patient and tumor characteristics and mortality.

PATIENTS AND METHODS

Patients diagnosed or treated with CRC at any VA institution in the fiscal years 2009 to 2012 were identified using 3 data sources: (1) VA Central Cancer Registry (VACCR); (2) VA Corporate Data Warehouse; and (3) VA Reports and Measures Portal. The CRC frequencies within the VA population and survival curves were examined descriptively and compared with the national projections using Surveillance, Epidemiology, and End Results program data.

RESULTS

A total of 12,551 veterans with CRC were included in the present analysis. The median age at diagnosis was 65.5 years. Approximately 97% (n = 12,229) of the CRC cases were diagnosed among men. Approximately 44% (n = 5517) of the patients were diagnosed with localized disease. The 3-year survival rate was associated with age (P < .01) and stage (P < .01) at diagnosis. We identified a possible decrease in VA CRC incidence over time.

CONCLUSION

Although the VA CRC patient population was heavily skewed toward the male gender, the patient and tumor characteristics were similar between the incident CRC cases reported by the VACCR and those reported to the Surveillance, Epidemiology, and End Results program. This suggests that research findings resulting from the VACCR might have applicability beyond the VA healthcare system setting.

Colorectal cancer survivorship statistics: A Veterans Affairs Central Cancer Registry analysis

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Background: Our objective was to evaluate VA CRC incidence and survival and compare with the National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) data. Methods: Data were obtained from VACCR for veterans diagnosed/treated in VA for incident CRC during fiscal years (FY) 2009-2012. Using VHA Support Service Center information about the distribution of VA healthcare system enrollees for corresponding years, we adjusted incidence rates for age and gender to the underlying VA population. Survival data were available through January 2015; thus, patients in the analysis had 3-6 years of follow-up data and were censored accordingly. CRC incidence and survival among VA patients was compared to projected national 2014 CRC-specific SEER and supporting data sources. Results: From FY 2009-2012, 12,551 patients (2.6% women; 97.4% men) were in the analytic cohort. Among VACCR patients, the most common tumor location was proximal colon (38%), followed by rectum (31%), distal colon (26%), and other colon (5%). This is comparable to SEER, in which proximal colon and rectum are most common. Among patients in the VACCR, SEER summary stage distribution was: 44% local, 36% regional, 17% distant and 4% unknown. This also aligns with SEER, in which approximately 40% of CRC cases are diagnosed locally. Mirroring SEER, overall VA CRC incidence rate decreased from 0.22 to 0.16 cases per 1,000 veterans in FYs 2009 and 2012. Evaluating survival, median follow-up time was 3.3 years among veterans. The 3-year survival rate for VA patients was 65.9%. Overall 3-year survival is slightly higher for rectal (66.4%) than for colon (65.6%). This is comparable to 5-year SEER survival rates (66.5% and 64.2% for rectal and colon, respectively). Also consistent with SEER, VA CRC patients < 65 have higher rates of 3-year survival than patients > 65 years (74.6% vs. 58.5%, respectively). Conclusions: VACCR data indicate that CRC incidence and survival in FY 2009-2012 approximated SEER projections during a similar timeframe. This suggests that, although VA patients are more complex than the general population, they are diagnosed with comparable CRC locations and stages.

Helping Invested Families Improve Veterans' Experiences Study (HI-FIVES): study design and methodology

Within the Veterans Health Administration (VHA), the largest integrated health care system in the US, approximately 8.5 million Veteran patients receive informal care. Despite a need for training, half of VHA caregivers report that they have not received training that they deemed necessary. Rigorous study is needed to identify effective ways of providing caregivers with the skills they need. This paper describes the Helping Invested Families Improve Veterans' Experience Study (HI-FIVES), an ongoing randomized controlled trial that is evaluating a skills training program designed to support caregivers of cognitively and/or functionally impaired, community-dwelling Veterans who have been referred to receive additional formal home care services. This two-arm randomized controlled trial will enroll a total of 240 caregiver-patient dyads. For caregivers in the HI-FIVES group, weekly individual phone training occurs for 3 weeks, followed by 4 weekly group training sessions, and two additional individual phone training calls. Caregivers in usual care receive information about the VA Caregiver Support Services Program services, including a hotline number. The primary outcome is the number of days a Veteran patient spends at home in the 12 months following randomization (e.g. not in the emergency department, inpatient or nursing home setting). Secondary outcomes include patient VHA health care costs, patient and caregiver satisfaction with VHA health care, and caregiver depressive symptoms. Outcomes from HI-FIVES have the potential to improve our knowledge of how to maximize the ability to maintain patients safely at home for caregivers while preventing poor mental health outcomes among caregivers.

Association between perceived life chaos and medication adherence in a postmyocardial infarction population

BACKGROUND

The benefits of medication adherence to control cardiovascular disease (CVD) are well defined, yet multiple studies have identified poor adherence. The influence of life chaos on medication adherence is unknown. Because this is a novel application of an instrument, our preliminary objective was to understand patient factors associated with chaos. The main objective was to evaluate the extent to which an instrument designed to measure life chaos is associated with CVD-medication nonadherence.

METHODS AND RESULTS

Using baseline data from an ongoing randomized trial to improve postmyocardial infarction (MI) management, multivariable logistic regression identified the association between life chaos and CVD-medication nonadherence. Patients had hypertension and a myocardial infarction in the past 3 years (n=406). Nearly 43% reported CVD-medication nonadherence in the past month. In simple linear regression, the following were associated with higher life chaos: medication nonadherence (β=1.86; 95% confidence interval [CI], 0.96-2.76), female sex (β=1.22; 95% CI [0.22-2.24]), minority race (β=1.72; 95% CI [0.78-2.66]), having less than high school education (β=2.05; 95% CI [0.71-3.39]), low health literacy (β=2.06; 95% CI [0.86-3.26]), and inadequate financial status (β=1.93; 95% CI [0.87-3.00]). Being married (β=-2.09, 95% CI [-3.03 to -1.15]) was associated with lower life chaos. As chaos quartile increased, patients exhibited more nonadherence. In logistic regression, adjusting for sex, race, marital status, employment, education, health literacy, and financial status, a 1-unit life chaos increase was associated with a 7% increase (odds ratio, 1.07; 95% CI [1.02-1.12]) in odds of reporting medication nonadherence.

CONCLUSIONS

Our results suggest that life chaos may be an important determinant of medication adherence. Life chaos screenings could identify those at risk for nonadherence.

CLINICAL TRIAL REGISTRATION

URL: http://www.clinicaltrials.gov. Unique identifier: NCT000901277.

Comparing three life-limiting diseases: does diagnosis matter or is sick, sick?

CONTEXT

At advanced stages, cancer, congestive heart failure (CHF), and chronic obstructive pulmonary disease (COPD) produce high rates of hospitalization, disability, and annual mortality. Despite similar prognoses, patients with cancer often are treated differently than those with other illnesses, the former being seen as terminal vs. chronic.

OBJECTIVES

The purpose of this study was to compare the functional capacity, emotional well-being, and quality of life of patients in three disease groups to assess whether diagnosis distinguishes differences in patient experience, and compare patients with cancer and noncancer diagnoses.

METHODS

Baseline data from a cohort study of 210 patients who had an estimated 50% two-year mortality were analyzed. The patients had Stage IV breast, prostate, or colon cancer; Stage IIIb or IV lung cancer; New York Heart Association Stage III or IV CHF with a left ventricular ejection fraction of <40%; or COPD with hypercapnea (pC02>46) and at least one hospitalization or Emergency Department visit during the past year. Measures included the Rosow-Breslau Activities of Daily Living/Instrumental Activities of Daily Living tool, Profile of Mood States anxiety subscale, brief Centers for Epidemiologic Studies Depression Scale, and the Functional Assessment of Cancer Therapy-General quality-of-life instrument. Analyses included descriptive statistics, analysis of variance, and adjusted linear regression models.

RESULTS

A majority of illness outcomes did not differ by diagnostic category. Functional status was associated with diagnosis, with CHF and COPD patients faring worse than those with cancer. Overall, illness experience was most significantly related to disease severity, demographics, and emotional and social well-being.

CONCLUSION

Comparing patients with advanced cancer, CHF, and COPD, illness experience was more similar than different. Patients living with life-limiting illnesses other than cancer may benefit from whole-person services often extended to cancer patients.

Secondary prevention risk interventions via telemedicine and tailored patient education (SPRITE): a randomized trial to improve postmyocardial infarction management

BACKGROUND

Secondary prevention by risk factor modification improves patient outcomes, yet it is often not achieved in clinical practice. Reasons for failure stem from challenges of prioritizing risk factor reduction and engaging patients in changing their behaviors. We hypothesize that a novel telemedicine intervention with tailored patient education could improve cardiovascular risk factors.

METHODS

To evaluate this intervention, we propose enrolling 450 patients with a recent myocardial infarction and hypertension into a 3-arm randomized, controlled trial. The first arm (n=150) will receive home blood pressure (BP) monitors plus a nurse-delivered, telephone-based tailored patient education intervention and will be enrolled into HealthVault, a Microsoft electronic health record platform. The second arm (n=150) will also receive BP monitors plus a tailored patient education intervention and be enrolled in HeartVault. However, the patient education intervention will be delivered by a Web-based program and will cover topics identical to those in the nurse-delivered intervention. Both arms will be compared with a control group receiving standard care (n=150). All participants will have an in-person assessment at baseline and at completion of the study, including standardized measurements of BP, LDL cholesterol, and glycosylated hemoglobin (in diabetic subjects). The study design will allow assessment of a telephone-based, nurse-administered disease management program versus standard care. The main outcome of interest is the reduction in systolic BP in each intervention group compared with the control group at 12 months. Secondary outcomes assessed will include reductions in LDL cholesterol, body weight, and glycosylated hemoglobin, as well as adherence to evidence-based therapies and improvement in health behaviors.

CONCLUSION

If successful in optimizing BP control, managing other coronary heart disease risk factors, and demonstrating a lower cost, the Web-based disease management tool has the potential to enhance coronary artery disease management, quality of care, and ultimately, patient outcomes. Clinical Trial Registration- URL: http://www.clinicaltrials.gov. Unique identifier: NCT00901277.

Worry as a window into the lives of people who use injection drugs: a factor analysis approach

BACKGROUND

The concept of risk dominates the HIV/AIDS literature pertaining to People Who Use Injection Drugs (PWUID). In contrast the associated concept of worry is infrequently applied, even though it can produce important perspectives of PWUID's lives. This study asked a sample (n = 105) of PWUID enrolled in a Victoria, British Columbia needle exchange program to evaluate their degree of worry about fourteen factors they may encounter in their daily lives.

METHODS

Exploratory factor analysis was used to analyze their responses.

RESULTS

Factor analysis delineated three factors: 1) overall personal security, 2) injection drug use-specific risks including overdosing and vein collapse and, 3) contracting infectious diseases associated with injection drug use (e.g. HIV/AIDS and hepatitis C).

CONCLUSION

PWUID in this study not only worry about HIV/AIDS but also about stressful factors in their daily life which have been linked to both increased HIV/AIDS risk behaviour and decreased anti-retroviral treatment adherence. The importance PWUID give to this broad range of worry/concerns emphasizes the need to place HIV/AIDS intervention, education, and treatment programs within a broader harm-reduction framework that incorporates their perspectives on both worry and risk.

Estimating the Occurrence of Amyotrophic Lateral Sclerosis among Gulf War (1990–1991) Veterans Using Capture-Recapture Methods

OBJECTIVE

Using data from a recent report that indicated a 2-fold higher risk of amyotrophic lateral sclerosis (ALS) among veterans of the 1991 Gulf War, we applied capture-recapture methodology to estimate possible under-ascertainment of ALS cases among deployed and non-deployed military personnel who were on active duty during that war.

STUDY DESIGN AND SETTING

One of the most serious concerns facing field epidemiological investigations is that of case ascertainment bias, particularly when it is differential among the study groups. Capture-recapture methods, however, have promise as an approach to assessing the impact of case ascertainment bias in such studies. To overcome potential limitations of any one approach, three different estimation methods were used: log-linear models, sample coverage, and ecological models, to obtain a comprehensive view of under-ascertainment bias in these populations.

RESULTS

All three approaches indicated differential undercount of ALS cases with modest under-ascertainment likely to have occurred among non-deployed military personnel, but little under-ascertainment among the deployed. After correcting the rates for under-ascertainment, the age-adjusted risk of ALS remained elevated among military personnel who had been deployed to S.W. Asia during the 1991 Gulf War, confirming the earlier report.

CONCLUSIONS

Capture-recapture methods are a useful approach to assessing the magnitude of case ascertainment bias in epidemiological studies from which ascertainment-adjusted estimates of rates and relative risks can be calculated.

Ten-year mortality for patients discharged after hospitalization for chest pain or other symptoms raising suspicion of acute myocardial infarction in relation to hospital discharge diagnosis

AIM

To describe the 10-year prognosis for patients discharged after hospitalization for chest pain or other symptoms giving an initial suspicion of acute myocardial infarction (AMI) in relation to the final hospital diagnosis and furthermore to compare the outcome amongst these patients with the outcome amongst a sex-, age- and community-matched control population.

METHODS

All patients who were hospitalized because of chest pain or other symptoms raising a suspicion of AMI and who were discharged alive from hospital. Patients were divided into three groups according to the final diagnosis: (1) confirmed or possible AMI, (2) confirmed or possible myocardial ischaemia and (3) other aetiology. Information on 10-year mortality was available in 3103 patients. A sex-, age- and community-matched control population (n=3221) was compared with the study population in terms of 10-year mortality. TIME OF SURVEY: 15 February 1986 to 9 November 1987.

SETTING

Sahlgrenska University Hospital.

RESULTS

Patients with confirmed or possible AMI (n=849) had a significantly higher mortality (59.4%) than patients with confirmed or possible myocardial ischaemia (n=1191) who had a mortality of 49.5% (P < 0.0001). The latter group had a higher mortality than patients with 'other aetiology' (n=1063) of whom 40.6% died (P < 0.0001). When comparing the prognosis for patients with AMI and myocardial ischaemia, there was a significant interaction with sex, with a more marked difference in women than in men. Amongst all patients, the 10-year mortality was 49.1 vs. 37.3% in the control group (P < 0.0001).

CONCLUSION

The very long term prognosis was strongly associated with diagnosis amongst patients hospitalized and discharged alive because of chest pain or other symptoms raising suspicion of AMI. The absolute mortality difference between patients who were discharged from hospital with confirmed diagnosis of AMI and those whose symptoms were considered to have other aetiology than AMI or ischaemia was nearly 20%. However, the absolute mortality difference between the patients included in the survey and a control population was only 12%.

Analysis of film coating thickness and surface area of pharmaceutical pellets using fluorescence microscopy and image analysis

A method is presented which enables geometrical characterisation of pharmaceutical pellets and their film coating. It provides a high level of details on the single pellet level. Image analysis was used to determine the coating thickness (h) applied on the pellets and the surface area (A) of the pellet cores. Different definitions of A and h are evaluated. Hierarchical analysis of variance was used to resolve different sources contributing to the total variance. The variance within pellets and the variance between pellets were found as significant sources of variation. Special emphasis was put on evaluation of A/h due to its influence on the release rate of an active drug substance from the pellet core. The pellet images were thus used to predict variations in the release rate using a mathematical model as a link between the image data and the release rate. General aspects of image analysis are discussed. The method would be useful in calibration of near infrared spectra to h in process analytical chemistry.

The 5' stem-loop regulates expression of collagen alpha1(I) mRNA in mouse fibroblasts cultured in a three-dimensional matrix

The stability of collagen alpha1(I) mRNA is regulated by its 5' stem-loop, which binds a cytoplasmic protein in a cap-dependent manner, and its 3'-untranslated region (UTR), which binds alphaCP. When cultured in a three-dimensional gel composed of type I collagen, mouse fibroblasts had decreased collagen alpha1(I) mRNA steady-state levels, which resulted from a decreased mRNA half-life. In cells cultured in gel, hybrid mouse-human collagen alpha1(I) mRNA with a wild-type 5' stem-loop decayed faster than the same mRNA with a mutated stem-loop. When the 5' stem-loop was placed in a heterologous mRNA, the mRNA accumulated to a lower level in cells grown in gel than in cells grown on plastic. This suggests that the 5' stem-loop down-regulates collagen alpha1(I) mRNA. Protein binding to the 5' stem-loop was reduced in cells grown in gel, which was associated with destabilization of the collagen alpha1(I) mRNA. In addition to the binding of a cytoplasmic protein, there was also a nuclear binding activity directed to the collagen alpha1(I) 5' stem-loop. The nuclear binding was increased in cells grown in gel, suggesting that it may negatively regulate expression of collagen alpha1(I) mRNA. Binding of alphaCP, a protein involved in stabilization of collagen alpha1(I) mRNA, was unchanged by the culture conditions.

Conversion operation Billroth II into Billroth I with jejunal interposition

First, under consideration of the erroneous operative often techniques often found in patients with B II gastrectomy, all functional complaints of these patients should prompt the consultant to recommend conversion surgery. Secondly, all recurrent ulcerations, whether peptic or anastomositis, represent an indication for conversion surgery. Last but not least reconstruction of normal nutrition passage in an important indication for surgery in patients with B II gastrectomy, restoring near physiologic passage circumstances. Particularly grave in its consequences is the gastric stump carcinoma with its fateful and irrevocable course for patients with B II gastrectomy if regular gastroscopic and laboratory follow-up inspection do not take place (regardless of questionable operation indication). We recall a tragic case of a woman with B II gastrectomy who refused conversion surgery despite histologic verification of metaplasia, who died of gastric stump carcinoma a year later.

Degradation pathway of pralidoxime chloride in concentrated acidic solution

The degradation products of pralidoxime chloride (1) (X- = Cl-) in concentrated aqueous solutions (less than or equal to 50% w/v) were identified using one or more methods: HPLC, polarography, voltammetry, MS and/or NMR. The products found were the 2-cyano-, 2-carboxamido- and 2-carboxy-1-methyl-pyridinium chlorides, 1-methyl pyridinium chloride, cyanide ion, ammonia and carbon dioxide. 1-Methyl-2-pyridone was indirectly identified by the presence of cyanide ion. The degradation rate increased with increasing pH values between pH 1 and 3.2 and with increasing concentrations between 1 and 50% w/v pralidoxime chloride. The results suggest that 1 (X- = Cl-) is dehydrated by a hydroxyl-ion catalyzed reaction ot the nitrile 2 which is hydrolyzed to either the pyridone 6 and cyanide ion or to 2-carboxamido-1-methyl-pyridinium chloride 3. The amide is hydrolyzed to give the 2-carboxy derivative 4 which finally is decarboxylated to give 1-methylpyridinium chloride 5.

Proximal renal tubular dysfunction in severe burns

Proximal renal tubular function was studied in 11 patients with severe burn injury. Creatinine clearance was normal or increased in ten patients. Fractional excretion of sodium was less than 1% in ten. Fractional excretion of uric acid and amylase were increased in all but four and two cases, respectively, while absolute clearances of lysozyme and beta 2-microglobulin were increased in all but one patient. Renal threshold phosphate concentration was reduced in four patients. Twenty-four-hour urine glucose excretion exceeded 1 g in five patients, aminoaciduria was noted in eight, and proteinuria, predominantly globulinuria, was present consistently. Metabolic acidosis was seen in one patient, and transient hypokalemia occurred in two. Abnormalities of proximal tubular function were more marked in the five patients with the greatest extent of third-degree burns who died. The cause of proximal tubular dysfunction is not clear and may be related to an adaptive response to severe injury.

Determination of water in penicillins using fast Karl Fischer reagents and electronic end-point optimization

When using conventional Karl Fischer reagents for titration of water in penicillins, decomposition products (i.e. penicilloic acid) are shown to be partly cotitrated. Water in ampicillin, bacampicillin, carboxybenzylpenicillin and cloxacillin was titrated with slow and fast reagents and the differences in the results obtained were compared with the content of penicilloic acid determined mercurimetrically. A simple electronic control unit has been developed to optimize the speed of titration.

Ambiguity processing by joint Fourier transform holography

Theory and practice of an optical ambiguity processor based on space-variant joint Fourier transform holography are presented. The approach evolves from the joint Fourier transform optical correlator concept, which represents a different technique of implementing the matched filter correlator concept advanced by Vander Lugt. Experimental demonstration using photographic film for signal recording and the thermoplastic device for hologram recording will be reported.