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Lau K, Malik A, Foroutan F, Ching C, Lu Y, Buchan T, Liu H, Kim H, Qiao A, Tan C, Leda M, Wang J, O'Brien K, Stein M, Elmslie C, Rigobon A, Chang D, Vargas JD, Ng N, Borgo A, Siemieniuk R, Sekercioglu N, Evaniew N, Ross H, Alba A. RESTING HEART RATE AS A PREDICTOR OF MORTALITY IN PATIENTS WITH HEART FAILURE. Can J Cardiol 2019. [DOI: 10.1016/j.cjca.2019.07.467] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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O'Brien K, SARAVANABAVAN S, Zhang J, Wong A, Luciuk M, Burgess J, Rangan G. SAT-126 PROGRESSION OF RENAL MICROVASCULAR ABNORMALITIES AND THE EFFECT OF SIROLIMUS ON ANGIOGENESIS IN EXPERIMENTAL POLYCYSTIC KIDNEY DISEASE. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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O'Brien K, Owen E, Margetts R, Kavaliunaite E, Creedon M. P340 The impact at 5-year follow up of gastrostomy tube placement on spirometry and BMI z-score in children with cystic fibrosis. J Cyst Fibros 2019. [DOI: 10.1016/s1569-1993(19)30632-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Stewart L, Smoak P, Hydock D, Hayward R, O'Brien K, Lisano J, Boeneke C, Christensen M, Mathias A. Milk and kefir maintain aspects of health during doxorubicin treatment in rats. J Dairy Sci 2019; 102:1910-1917. [DOI: 10.3168/jds.2018-15576] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 11/20/2018] [Indexed: 12/24/2022]
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Rice S, O'Brien K, Chew M, Qudairat E. Fabricated facial rash - an unusual presentation of factitious disorder. Br Dent J 2018; 225:1063-1066. [PMID: 30573903 DOI: 10.1038/sj.bdj.2018.1036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/07/2018] [Indexed: 11/09/2022]
Abstract
Patients with factitious disorder typically present with signs or symptoms suggesting a medical problem, but which transpire to be self-induced or fabricated. Repeated investigations and treatments are often carried out to no avail before this possibility is considered. In this case, a 51-year-old female presented to the oral and maxillofacial surgery unit with toothache and a facial rash. Following admission to hospital a range of investigations were performed, and a tooth was extracted. Judicious attention by nursing staff led to the discovery that the patient had been applying make-up to mimic a skin rash. This concern was raised with the patient and she admitted falsifying the rash. Although this patient may have been experiencing pain, by applying make-up in this manner she sought to exaggerate the severity of her condition and as a result underwent potentially unnecessary procedures. This case provides a reminder that the possibility of factitious disorder should be considered in cases where patients present with symptoms or signs which appear fabricated or self-inflicted, defy anatomical or physiological principles, or do not correlate with the history. Thorough history taking is essential, and access to electronic care records may be informative. Psychiatric follow-up is recommended, but not all patients are willing to engage with this process.
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Hamilton-Craig C, Staeb D, O'Brien K, Galloway G, Barth M. 11637-Tesla Cardiac MRI for Ventricular and Valvular quantitation in healthy volunteers. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.1163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Arcaya MC, Schnake-Mahl A, Binet A, Simpson S, Church MS, Gavin V, Coleman B, Levine S, Nielsen A, Carroll L, Ursprung S, Wood B, Reeves H, Keppard B, Sportiche N, Partirdge J, Figueora J, Frakt A, Alfonzo M, Abreu D, Abreu T, Ambroise T, Andrade E, Barrientos E, Baty A, Baty C, Benner K, Bennett C, Blanchette A, Bongiovanni R, Cardile O, Corchado C, Dixon C, Dodson C, Dominguez J, Durena M, Fiestas Y, Genty J, Graffam N, Gonzalez A, Grigsby E, Hayden P, Alvado SH, Hernandez Z, Hodes I, Johnson J, Keefe K, Latimer K, Levine S, Logg C, Martinez N, Mboup K, McPhorson D, Meacham S, Mohammed D, Moss E, Nielsen A, O'Brien K, Owens L, Partridge J, Johnson LP, Power MB, Rebelo T, Remy R, Roderigues G, Sabtow Q, Sanchez C, Seeder A, Sepulveda R, Sportiche N, Ursprung S, West E, Winters L, Wood B, Youmans T. Community change and resident needs: Designing a Participatory Action Research study in Metropolitan Boston. Health Place 2018; 52:221-230. [PMID: 30015179 DOI: 10.1016/j.healthplace.2018.05.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 05/18/2018] [Accepted: 05/31/2018] [Indexed: 10/28/2022]
Abstract
The health implications of urban development, particularly in rapidly changing, low-income urban neighborhoods, are poorly understood. We describe the Healthy Neighborhoods Study (HNS), a Participatory Action Research study examining the relationship between neighborhood change and population health in nine Massachusetts neighborhoods. Baseline data from the HNS survey show that social factors, specifically income insecurity, food insecurity, social support, experiencing discrimination, expecting to move, connectedness to the neighborhood, and local housing construction that participants believed would improve their lives, identified by a network of 45 Resident Researchers exhibited robust associations with self-rated and mental health. Resident-derived insights into relationships between neighborhoods and health may provide a powerful mechanism for residents to drive change in their communities.
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Harris M, Brathwaite R, McGowan CR, Ciccarone D, Gilchrist G, McCusker M, O'Brien K, Dunn J, Scott J, Hope V. 'Care and Prevent': rationale for investigating skin and soft tissue infections and AA amyloidosis among people who inject drugs in London. Harm Reduct J 2018; 15:23. [PMID: 29739408 PMCID: PMC5941602 DOI: 10.1186/s12954-018-0233-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 05/02/2018] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Skin and soft tissue infections (SSTIs) are a leading cause of morbidity and mortality among people who inject drugs (PWID). International data indicate up to one third of PWID have experienced an SSTI within the past month. Complications include sepsis, endocarditis and amyloid A (AA) amyloidosis. AA amyloidosis is a serious sequela of chronic SSTI among PWID. Though there is a paucity of literature reporting on AA amyloidosis among PWID, what has been published suggests there is likely a causal relationship between AA amyloidosis and injecting-related SSTI. If left untreated, AA amyloidosis can lead to renal failure; premature mortality among diagnosed PWID is high. Early intervention may reverse disease. Despite the high societal and individual burden of SSTI among PWID, empirical evidence on the barriers and facilitators to injecting-related SSTI prevention and care or the feasibility and acceptability of AA amyloidosis screening and treatment referral are limited. This study aims to fill these gaps and assess the prevalence of AA amyloidosis among PWID. METHODS Care and Prevent is a UK National Institute for Health Research-funded mixed-methods study. In five phases (P1-P5), we aim to assess the evidence for AA amyloidosis among PWID (P1); assess the feasibility of AA amyloidosis screening, diagnostic and treatment referral among PWID in London (P2); investigate the barriers and facilitators to AA amyloidosis care (P3); explore SSTI protection and risk (P4); and co-create harm reduction resources with the affected community (P5). This paper describes the conceptual framework, methodological design and proposed analysis for the mixed-methods multi-phase study. RESULTS We are implementing the Care and Prevent protocol in London. The systematic review component of the study has been completed and published. Care and Prevent will generate an estimate of AA amyloidosis prevalence among community recruited PWID in London, with implications for the development of screening recommendations and intervention implementation. We aim to recruit 400 PWID from drug treatment services in London, UK. CONCLUSIONS Care and Prevent is the first study to assess screening feasibility and the prevalence of positive proteinuria, as a marker for AA amyloidosis, among PWID accessing drug treatment services. AA amyloidosis is a serious, yet under-recognised condition for which early intervention is available but not employed.
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Witz C, Doody K, Park J, Seifu Y, O'Brien K, Yankov V, Heiser P. Highly purified human menotropin (HP-HMG) versus recombinant follicle stimulating hormone (RFSH) in high responders undergoing in vitro fertilization (IVF): MEGASET-HR trial outcomes. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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O'Connor M, O'Brien K, Waller J, Gallagher P, D'Arcy T, Flannelly G, Martin CM, McRae J, Prendiville W, Ruttle C, White C, Pilkington L, O'Leary JJ, Sharp L. Physical after-effects of colposcopy and related procedures, and their inter-relationship with psychological distress: a longitudinal survey. BJOG 2017; 124:1402-1410. [PMID: 28374937 DOI: 10.1111/1471-0528.14671] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/29/2017] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To estimate prevalence of post-colposcopy physical after-effects and investigate associations between these and subsequent psychological distress. DESIGN Longitudinal survey. SETTING Two hospital-based colposcopy clinics. POPULATION Women with abnormal cytology who underwent colposcopy (±related procedures). METHODS Questionnaires were mailed to women 4, 8 and 12 months post-colposcopy. Details of physical after-effects (pain, bleeding and discharge) experienced post-colposcopy were collected at 4 months. Colposcopy-specific distress was measured using the Process Outcome-Specific Measure at all time-points. Linear mixed-effects regression was used to identify associations between physical after-effects and distress over 12 months, adjusting for socio-demographic and clinical variables. MAIN OUTCOME MEASURES Prevalence of post-colposcopy physical after-effects. Associations between the presence of any physical after-effects, awareness of after-effects, and number of after-effects and distress. RESULTS Five-hundred and eighty-four women were recruited (response rate = 73, 59 and 52% at 4, 8 and 12 months, respectively). Eighty-two percent of women reported one or more physical after-effect(s). Multiple physical after-effects were common (two after-effects = 25%; three after-effects = 25%). Psychological distress scores declined significantly over time. In adjusted analyses, women who experienced all three physical after-effects had on average a 4.58 (95% CI: 1.10-8.05) higher distress scored than those who experienced no after-effects. Women who were unaware of the possibility of experiencing after-effects scored significantly higher for distress during follow-up. CONCLUSIONS The prevalence of physical after-effects of colposcopy and related procedures is high. The novel findings of inter-relationships between awareness of the possibility of after-effects and experiencing multiple after-effects, and post-colposcopy distress may be relevant to the development of interventions to alleviate post-colposcopy distress. TWEETABLE ABSTRACT Experiencing multiple physical after-effects of colposcopy is associated with psychological distress.
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O'Brien K, Boeneke C, Prinyawiwatkul W, Lisano J, Shackelford D, Reeves K, Christensen M, Hayward R, Ordonez KC, Stewart L. Short communication: Sensory analysis of a kefir product designed for active cancer survivors. J Dairy Sci 2017; 100:4349-4353. [DOI: 10.3168/jds.2016-12320] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 02/12/2017] [Indexed: 02/03/2023]
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O'Brien K, Samson S, Sanna R, McLaughlin JE. The Application of “One-Group” Transport Theory to β-Ray Dosimetry. NUCL SCI ENG 2017. [DOI: 10.13182/nse64-a18143] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Nelson C, O'Brien K, Mendizabal A, Gersten I, Uhl L, Chung D, Shah N, Avigan D, Pasquini M. Development and management of a multi-center, center-specific cellular therapy manufacturing approach: The experience of the Blood and Marrow Transplant Clinical Trials Network (BMT CTN) Protocol #1401. Cytotherapy 2017. [DOI: 10.1016/j.jcyt.2017.02.201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Tsichlaki A, O'Brien K, Johal A, Fleming PS. A scoping review of outcomes related to orthodontic treatment measured in cleft lip and palate. Orthod Craniofac Res 2017; 20:55-64. [DOI: 10.1111/ocr.12152] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/24/2017] [Indexed: 01/21/2023]
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Zou M, Bhatia A, Dong H, Jayaprakash P, Guo J, Sahu D, Hou Y, Tsen F, Tong C, O'Brien K, Situ AJ, Schmidt T, Chen M, Ying Q, Ulmer TS, Woodley DT, Li W. Evolutionarily conserved dual lysine motif determines the non-chaperone function of secreted Hsp90alpha in tumour progression. Oncogene 2017; 36:2160-2171. [PMID: 27721406 PMCID: PMC5386837 DOI: 10.1038/onc.2016.375] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 08/30/2016] [Accepted: 09/01/2016] [Indexed: 12/16/2022]
Abstract
Both intracellular and extracellular heat shock protein-90 (Hsp90) family proteins (α and β) have been shown to support tumour progression. The tumour-supporting activity of the intracellular Hsp90 is attributed to their N-terminal ATPase-driven chaperone function. What molecular entity determines the extracellular function of secreted Hsp90 and the distinction between Hsp90α and Hsp90β was unclear. Here we demonstrate that CRISPR/Case9 knocking out Hsp90α nullifies tumour cells' ability to migrate, invade and metastasize without affecting the cell survival and growth. Knocking out Hsp90β leads to tumour cell death. Extracellular supplementation with recombinant Hsp90α, but not Hsp90β, protein recovers tumourigenicity of the Hsp90α-knockout cells. Sequential mutagenesis identifies two evolutionarily conserved lysine residues, lys-270 and lys-277, in the Hsp90α subfamily that determine the extracellular Hsp90α function. Hsp90β subfamily lacks the dual lysine motif and the extracellular function. Substitutions of gly-262 and thr-269 in Hsp90β with lysines convert Hsp90β to a Hsp90α-like protein. Newly constructed monoclonal antibody, 1G6-D7, against the dual lysine region of secreted Hsp90α inhibits both de novo tumour formation and expansion of already formed tumours in mice. This study suggests an alternative therapeutic approach to target Hsp90 in cancer, that is, the tumour-secreted Hsp90α, instead of the intracellular Hsp90α and Hsp90β.
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Schofield T, Foroutan F, Ryoo S, O'Brien K, Alba A, Hussain S, Rao V, Ross H, Billia F. Association of Body Mass Index and Age on Risk of Driveline Infection Post Ventricular Assist Device Implantation. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Balfe M, Keohane K, O'Brien K, Sharp L. Social networks, social support and social negativity: A qualitative study of head and neck cancer caregivers' experiences. Eur J Cancer Care (Engl) 2016; 26. [PMID: 28004448 DOI: 10.1111/ecc.12619] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/05/2016] [Indexed: 11/30/2022]
Abstract
Head and neck cancer is a serious form of cancer that can generate substantial physical and psychosocial morbidity. Informal caregivers can help patients to manage head and neck cancer and its emotional impacts, both during and after treatment. Caregivers, however, can experience considerable stress as a result of their caring activities. Supportive relationships can protect caregivers from psychosocial strain. Thirty-one head and neck cancer caregivers were interviewed about their experiences of accessing social support from their social networks; difficulties that they experienced accessing this support; and strategies that they used to address these difficulties. Results suggest that head and neck cancer caregivers strongly value social support, but can find it difficult to obtain, and a number of them experience socially negative responses from their networks. Some carers attempt to answer or supplement support deficiencies by turning to non-human coping supports, such as pets, spiritual figures or medication. Implications for theory and practice are discussed.
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Payne K, Davison N, Thompson AJ, O'Brien K, Bruce IA. Use of a structured elicitation exercise to estimate the prevalence of OME in children with cleft palate. Clin Otolaryngol 2016; 42:904-907. [PMID: 27743503 DOI: 10.1111/coa.12771] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/05/2016] [Indexed: 11/28/2022]
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Foroutan F, Guyatt GH, O'Brien K, Bain E, Stein M, Bhagra S, Sit D, Kamran R, Chang Y, Devji T, Mir H, Manja V, Schofield T, Siemieniuk RA, Agoritsas T, Bagur R, Otto CM, Vandvik PO. Prognosis after surgical replacement with a bioprosthetic aortic valve in patients with severe symptomatic aortic stenosis: systematic review of observational studies. BMJ 2016; 354:i5065. [PMID: 27683072 PMCID: PMC5040922 DOI: 10.1136/bmj.i5065] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
OBJECTIVE To determine the frequency of survival, stroke, atrial fibrillation, structural valve deterioration, and length of hospital stay after surgical replacement of an aortic valve (SAVR) with a bioprosthetic valve in patients with severe symptomatic aortic stenosis. DESIGN Systematic review and meta-analysis of observational studies. DATA SOURCES Medline, Embase, PubMed (non-Medline records only), Cochrane Database of Systematic Reviews, and Cochrane CENTRAL from 2002 to June 2016. STUDY SELECTION Eligible observational studies followed patients after SAVR with a bioprosthetic valve for at least two years. METHODS Reviewers, independently and in duplicate, evaluated study eligibility, extracted data, and assessed risk of bias for patient important outcomes. We used the GRADE system to quantify absolute effects and quality of evidence. Published survival curves provided data for survival and freedom from structural valve deterioration, and random effect models provided the framework for estimates of pooled incidence rates of stroke, atrial fibrillation, and length of hospital stay. RESULTS In patients undergoing SAVR with a bioprosthetic valve, median survival was 16 years in those aged 65 or less, 12 years in those aged 65 to 75, seven years in those aged 75 to 85, and six years in those aged more than 85. The incidence rate of stroke was 0.25 per 100 patient years (95% confidence interval 0.06 to 0.54) and atrial fibrillation 2.90 per 100 patient years (1.78 to 4.79). Post-SAVR, freedom from structural valve deterioration was 94.0% at 10 years, 81.7% at 15 years, and 52% at 20 years, and mean length of hospital stay was 12 days (95% confidence interval 9 to 15). CONCLUSION Patients with severe symptomatic aortic stenosis undergoing SAVR with a bioprosthetic valve can expect only slightly lower survival than those without aortic stenosis, and a low incidence of stroke and, up to 10 years, of structural valve deterioration. The rate of deterioration increases rapidly after 10 years, and particularly after 15 years.
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Holmes L, Tworig J, Casini J, Morgan I, O'Brien K, Oceanic P, Dabney K. Implication of Socio-Demographics on Cognitive-Related Symptoms in Sports Concussion Among Children. SPORTS MEDICINE-OPEN 2016; 2:38. [PMID: 27747794 PMCID: PMC5023651 DOI: 10.1186/s40798-016-0058-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 08/03/2016] [Indexed: 12/02/2022]
Abstract
Background Sports-related concussion remains a public health challenge due to its morbidity and mortality. One of the consequences of concussion is cognitive impairment (CI) and cognitive-related symptoms (CRS) which determine, to some extent, physical and behavioral functioning of children who sustain concussion. Despite the high prevalence of CI and CRS associated with concussion, the risk factors are not fully understood. We aimed to characterize CRS and to examine its relationship with race, ethnicity, age, insurance, and sex in a pediatric population. Methods A retrospective cohort (case-only) design was used to assess CRS prevalence and its relationship with race and sex using a pediatric hospital’s electronic medical records. A consecutive sample was used with 1429 cases between 2007 and 2014. Study characteristics were examined using chi-square and log binomial regression for hypothesis-specific testing. Results Of the 1429 cases, 872 (61.0 %) were boys and 557 (39.0 %) were girls. The racial distribution indicated 1146 (80.2 %) Whites, 170 (11.9 %) Blacks/African Americans, and 113 (7.9 %) others. The prevalence of CRS was 78.0 %. Whereas boys had sustained more concussions, girls were more likely to present with CRS; prevalence risk ratio = 1.07, 95 % CI 1.01–1.13, p = 0.02. The crude analysis indicated no racial disparities in CRS prevalence, but the multivariable analysis did, comparing White to Black/African American children; adjusted prevalence risk ratio (aPRR) = 1.77, 99 % CI 1.02–3.08, p = 0.008. Conclusions Racial disparities exist in CRS among children with sports-related concussion, and Black/African American children are more likely, relative to Whites, to suffer CRS. Due to uncertainty in causal inference, we caution the interpretation and application of these data in risk-adapted concussion prevention.
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Puhl RM, Latner JD, O'Brien K, Luedicke J, Forhan M, Danielsdottir S. Cross-national perspectives about weight-based bullying in youth: nature, extent and remedies. Pediatr Obes 2016; 11:241-50. [PMID: 26149218 DOI: 10.1111/ijpo.12051] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Accepted: 05/20/2015] [Indexed: 11/29/2022]
Abstract
BACKGROUND No cross-national studies have examined public perceptions about weight-based bullying in youth. OBJECTIVES To conduct a multinational examination of public views about (i) the prevalence/seriousness of weight-based bullying in youth; (ii) the role of parents, educators, health providers and government in addressing this problem and (iii) implementing policy actions to reduce weight-based bullying. METHODS A cross-sectional survey of adults in the United States, Canada, Iceland and Australia (N = 2866). RESULTS Across all countries, weight-based bullying was identified as the most prevalent reason for youth bullying, by a substantial margin over other forms of bullying (race/ethnicity, sexual orientation and religion). Participants viewed parents and teachers as playing major roles in efforts to reduce weight-based bullying. Most participants across countries (77-94%) viewed healthcare providers to be important intervention agents. Participants (65-87%) supported government augmentation of anti-bullying laws to include prohibiting weight-based bullying. Women expressed higher agreement for policy actions than men, with no associations found for participants' race/ethnicity or weight. Causal beliefs about obesity were associated with policy support across countries. CONCLUSIONS Across countries, strong recognition exists of weight-based bullying and the need to address it. These findings may inform policy-level actions and clinical practices concerning youth vulnerable to weight-based bullying.
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Tonkopi E, O'Brien K. MO-FG-CAMPUS-IeP1-03: Establishment of Provincial Diagnostic Reference Levels in Pediatric Imaging. Med Phys 2016. [DOI: 10.1118/1.4957335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Diaz FJ, Hatakeyama T, Rho J, Wang Y, O'Brien K, Zhang X, Martijn de Sterke C, Kuhlmey BT, Palomba S. Sensitive method for measuring third order nonlinearities in compact dielectric and hybrid plasmonic waveguides. OPTICS EXPRESS 2016; 24:545-554. [PMID: 26832285 DOI: 10.1364/oe.24.000545] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We demonstrate a sensitive method for the nonlinear optical characterization of micrometer long waveguides, and apply it to typical silicon-on-insulator nanowires and to hybrid plasmonic waveguides. We demonstrate that our method can detect extremely small nonlinear phase shifts, as low as 7.5·10<(-4) rad. The high sensitivity achieved imparts an advantage when investigating the nonlinear behavior of metallic structures as their short propagation distances complicates the task for conventional methods. Our results constitute the first experimental observation of χ((3)) nonlinearities in the hybrid plasmonic platform and is important to test claims of hybrid plasmonic structures as candidates for efficient nonlinear optical devices.
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Gran B, Crooks J, Cook K, Hussein K, O'Brien K, Braitch M, Kareem H, Constantinescu C, Robinson K. Helicobacter pylori infection reduces disease severity in an experimental model of multiple sclerosis. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Macklin C, O'Brien K, Hover D, Schwartz ME, Bolkhovsky V, Zhang X, Oliver WD, Siddiqi I. A near-quantum-limited Josephson traveling-wave parametric amplifier. Science 2015; 350:307-10. [DOI: 10.1126/science.aaa8525] [Citation(s) in RCA: 360] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 08/19/2015] [Indexed: 11/02/2022]
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