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Flannery D, Janssens K, Sully F, Howden E, Elliott A, Sanders P, Kalman J, La Gerche A. The Relationship of Arrhythmias at Rest with Arrhythmias During Exercise in Former Endurance Athletes. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Agbaedeng T, Mahajan R, Munawar D, Elliott A, Twomey D, Khokhar K, Lau D, Sanders P. P5316Risk of sudden cardiac death in obesity: A systematic review and meta-analysis of emerging evidence. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5316] [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: 11/12/2022] Open
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Degenholtz H, Van Haitsma K, Mihelic A, Abbott K, Elliott A, Roberts T, Benner C, Chiorello P. NATIONAL DISSEMINATION OF PERSON-CENTERED CARE IN NURSING HOMES: BARRIERS TO IMPLEMENTATION. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Elliott A, Højlund M, Mørk T, Christensen T, Jeppesen R, Madsen N, Viuff A, Hjorth P, Nielsen J, Munk-Jørgensen P. QTc Interval in individuals with schizophrenia receiving antipsychotic as monotherapy or polypharmacy. Eur Psychiatry 2017. [DOI: 10.1016/j.eurpsy.2017.01.2131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
IntroductionAntipsychotics are associated with the polymorphic ventricular tachycardia, Torsade's de pointes, which in worst case can lead to sudden cardiac death. The QTc interval is used as a clinical proxy for Torsade's de pointes. QTc interval is prolonged by monotherapy with antipsychotic, but it is unknown if the QTc interval is prolonged further with antipsychotic polypharmacy.ObjectivesTo investigate the associations between QTc interval and antipsychotic mono- and polypharmaceutical treatment, respectively, in schizophrenic patients.AimsTo learn more about the impact of antipsychotics on the QTc interval.MethodsAn observational cohort study of unselected patients with schizophrenia visiting outpatient facilities in the Region of Central Jutland, Denmark. Patients were enrolled from January 2013 through March 2015 with follow-up until June 2015. Data was collected from clinical interviews and clinical case records.ResultsECGs were available in 58 patients receiving antipsychotic treatment. We observed no difference in average QTc interval for the whole sample of patients receiving monotherapy or polypharmacy (P = 0.29). However, women presented longer QTc-interval on polypharmacy than on monotherapy (P = 0.01).ConclusionWe recommend an increased focus on monitoring the QTc interval in woman with schizophrenia receiving antipsychotics as polypharmacy.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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Linz D, Linz B, Hohl M, Lau D, Elliott A, Mahajan R, Hendriks J, Sanders P. Simulated Obstructive Respiratory Events, but not Intermittent Hypoxia Alone, Result in the Development of an Atrial Arrhythmogenic Substrate in a Novel Rat Model for Sleep Apnoea. Heart Lung Circ 2017. [DOI: 10.1016/j.hlc.2017.06.296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Verdicchio C, Wijaithum P, Elliott A, Lau D, Sanders P, Mahajan R. Restoration of Sinus Rhythm Improves Exercise Capacity in Patients with Persistent Atrial Fibrillation: A Meta-Analysis. Heart Lung Circ 2017. [DOI: 10.1016/j.hlc.2017.06.295] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Khokhar K, Stiles M, Elliott A, Mahajan R, Lau D, Munawar A, Thiyagarajah A, Agbaedeng T, Gallaghar C, Sanders P. Aortic Stiffness in Atrial Fibrillation: A Systematic Review and Meta-Analysis. Heart Lung Circ 2017. [DOI: 10.1016/j.hlc.2017.06.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Mahajan R, Lew L, Koh Y, Kohkar K, Elliott A, Gallagher C, Hendriks J, Middeldorp M, Munawar D, Thiyagarajah A, Lau D, Sanders P. Predictive Role of Atrial Fibrillation in Cognitive Decline: A Meta-Analysis. Heart Lung Circ 2017. [DOI: 10.1016/j.hlc.2017.06.332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Linz D, Hohl M, Lau D, Marahjan R, Elliott A, Hendriks J, Sanders P. Cathepsin A Mediates Susceptibility to Atrial Tachyarrhythmia in Rats with Myocardial Ischaemia/Reperfusion. Heart Lung Circ 2017. [DOI: 10.1016/j.hlc.2017.06.267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Agbaedeng T, Mahajan R, Munawar D, Thanigaimani S, Elliott A, Khokhar K, Akpoveso O, Twomey D, Lau D, Sanders P. Mechanisms of Ventricular Remodelling in a Chronically Obese Ovine Sheep Model: Implication for Sudden Cardiac Death. Heart Lung Circ 2017. [DOI: 10.1016/j.hlc.2017.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Gallagher C, Hendriks J, Giles L, Elliott A, Middeldorp M, Mahajan R, Lau D, Sanders P, Wong C. Twenty-Year National Trends in Hospitalisations Due to Atrial Fibrillation in Australia: A Relentless Rise. Heart Lung Circ 2017. [DOI: 10.1016/j.hlc.2017.06.302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Russell AM, Sonecha S, Datta A, Hewitt R, Howell I, Elliott A, Wickremasinghe M. P276 Development of patient reported experience measure (PREM) for idiopathic pulmonary fibrosis (IPF). Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.419] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Pesaran T, Karam R, Huether R, Li S, Farber-Katz S, Chamberlin A, Chong H, LaDuca H, Elliott A. Beyond DNA: An Integrated and Functional Approach for Classifying Germline Variants in Breast Cancer Genes. Int J Breast Cancer 2016; 2016:2469523. [PMID: 27822389 PMCID: PMC5086358 DOI: 10.1155/2016/2469523] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Revised: 09/04/2016] [Accepted: 09/19/2016] [Indexed: 11/17/2022] Open
Abstract
Genetic testing for hereditary breast cancer is an integral part of individualized care in the new era of precision medicine. The accuracy of an assay is reliant on not only the technology and bioinformatics analysis utilized but also the experience and infrastructure required to correctly classify genetic variants as disease-causing. Interpreting the clinical significance of germline variants identified by hereditary cancer testing is complex and has a significant impact on the management of patients who are at increased cancer risk. In this review we give an overview of our clinical laboratory's integrated approach to variant assessment. We discuss some of the nuances that should be considered in the assessment of genomic variants. In addition, we highlight lines of evidence such as functional assays and structural analysis that can be useful in the assessment of rare and complex variants.
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Kumar S, Mahajan R, Elliott A, Middeldorp M, Munawar A, Twomey D, Lau D, Sanders P. Effect of Risk Factor and Weight Reduction on Idiopathic Premature Ventricular Complexes. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Agbaedeng T, Mahajan R, Munawar D, Elliott A, Twomey D, Kurmar S, Varzaly J, Lau D, Sanders P. Meta-Analysis of Effects of Epicardial Fat and Anterior Fat Pad Dissection on Postoperative Atrial Fibrillation. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Gallagher C, Hendriks J, Elliott A, Rangnekar G, Middeldorp M, Mahajan R, Lau D, Sanders P. Alcohol and Incident AF – What Should the Recommendations be? Insights from a Systematic Review and Meta-Analysis. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kumar S, Mahajan R, Elliott A, Munawar A, Twomey D, Middeldorp M, Gallagher C, Hendriks J, Lau D, Sanders P. Obesity Paradox in Heart Failure: Impact on Death. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Elliott A, Rangnekar G, Mahajan R, Lau D, Middeldorp M, Sanders P. Interaction between Age and Endurance Exercise on Atrial Remodelling and Ectopy: Implications for Atrial Fibrillation Risk in Athletes. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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69
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Agbaedeng T, Mahajan R, Munawar D, Elliott A, Twomey D, Kurmar S, Lau D, Sanders P. Meta-Analysis of Effects of Epicardial Fat on Atrial Fibrillation and Ablation Outcome. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Elliott A. A Photographic Method for Recording Lines of Constant Optical Density in a Negative (Isophotes). ACTA ACUST UNITED AC 2016. [DOI: 10.1080/00223638.1970.11737529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Knutson F, Osselaer J, Pierelli L, Lozano M, Cid J, Tardivel R, Garraud O, Hervig T, Domanovic D, Cukjati M, Gudmundson S, Hjalmarsdottir IB, Castrillo A, Gonzalez R, Brihante D, Santos M, Schlenke P, Elliott A, Lin JS, Tappe D, Stassinopoulos A, Green J, Corash L. A prospective, active haemovigilance study with combined cohort analysis of 19,175 transfusions of platelet components prepared with amotosalen-UVA photochemical treatment. Vox Sang 2015; 109:343-52. [PMID: 25981525 PMCID: PMC4690512 DOI: 10.1111/vox.12287] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Revised: 03/24/2015] [Accepted: 03/27/2015] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND OBJECTIVES A photochemical treatment process (PCT) utilizing amotosalen and UVA light (INTERCEPT(™) Blood System) has been developed for inactivation of viruses, bacteria, parasites and leucocytes that can contaminate blood components intended for transfusion. The objective of this study was to further characterize the safety profile of INTERCEPT-treated platelet components (PCT-PLT) administered across a broad patient population. MATERIALS AND METHODS This open-label, observational haemovigilance programme of PCT-PLT transfusions was conducted in 21 centres in 11 countries. All transfusions were monitored for adverse events within 24 h post-transfusion and for serious adverse events (SAEs) up to 7 days post-transfusion. All adverse events were assessed for severity (Grade 0-4), and causal relationship to PCT-PLT transfusion. RESULTS Over the course of 7 years in the study centres, 4067 patients received 19,175 PCT-PLT transfusions. Adverse events were infrequent, and most were of Grade 1 severity. On a per-transfusion basis, 123 (0.6%) were classified an acute transfusion reaction (ATR) defined as an adverse event related to the transfusion. Among these ATRs, the most common were chills (77, 0.4%) and urticaria (41, 0.2%). Fourteen SAEs were reported, of which 2 were attributed to platelet transfusion (<0.1%). No case of transfusion-related acute lung injury, transfusion-associated graft-versus-host disease, transfusion-transmitted infection or death was attributed to the transfusion of PCT-PLT. CONCLUSION This longitudinal haemovigilance safety programme to monitor PCT-PLT transfusions demonstrated a low rate of ATRs, and a safety profile consistent with that previously reported for conventional platelet components.
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Saint DA, Horton D, Yool A, Elliott A. A progressive assessment strategy improves student learning and perceived course quality in undergraduate physiology. ADVANCES IN PHYSIOLOGY EDUCATION 2015; 39:218-222. [PMID: 26330042 DOI: 10.1152/advan.00004.2015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In 2010, second-year physiology (n = 165) had a traditional single 3-h end-of-semester exam. To provide diagnostic feedback earlier, for students enrolled in 2011 (n = 128), we incorporated an in-class exam at 3 wk in addition to the final exam. Based on initial analysis and positive student comments, for the 2012 cohort (n = 148), we expanded this to incorporate four 1-h in-class exams every 3 wk plus a short final integrative exam. Average scores from exams and questionnaires (student evaluations of learning and teaching, 10 questions) were compared among 2010, 2011, and 2012 cohorts. We also compared scores in the practical component of the course, which had a constant format for all cohorts. Data are given as means ± SD; statistical analyses were done with unpaired two-way Students t-tests. From 2010 to 2012, there was a significant improvement in total exam scores (59.7 ± 15.8 vs. 68.6 ± 14.2, P < 0.001) but no significant change in total practical scores (72.3 ± 9.0 vs. 74.4 ± 10.2, P = 0.05), indicating that the rise in exam score was not due to higher academic abilities of the 2012 cohort. Overall mean student evaluation of learning and teaching responses (4.9 ± 0.4 vs. 5.3 ± 0.3, P = 0.015) and overall percent broad agreement (66.0 ± 8.0 vs. 79.2 ± 7.5, P = 0.003) indicated a significant improvement in student satisfaction. In conclusion, both learning outcome and perceived course quality were enhanced by the increased frequency of examinations, possibly by promoting consistent student study habits.
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Pathak RK, Elliott A, Middeldorp ME, Meredith M, Mehta AB, Mahajan R, Hendriks JML, Twomey D, Kalman JM, Abhayaratna WP, Lau DH, Sanders P. Impact of CARDIOrespiratory FITness on Arrhythmia Recurrence in Obese Individuals With Atrial Fibrillation: The CARDIO-FIT Study. J Am Coll Cardiol 2015; 66:985-96. [PMID: 26113406 DOI: 10.1016/j.jacc.2015.06.488] [Citation(s) in RCA: 355] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 06/19/2015] [Accepted: 06/19/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Obesity begets atrial fibrillation (AF). Although cardiorespiratory fitness is protective against incident AF in obese individuals, its effect on AF recurrence or the benefit of cardiorespiratory fitness gain is unknown. OBJECTIVES This study sought to evaluate the role of cardiorespiratory fitness and the incremental benefit of cardiorespiratory fitness improvement on rhythm control in obese individuals with AF. METHODS Of 1,415 consecutive patients with AF, 825 had a body mass index ≥27 kg/m(2) and were offered risk factor management and participation in a tailored exercise program. After exclusions, 308 patients were included in the analysis. Patients underwent exercise stress testing to determine peak metabolic equivalents (METs). To determine a dose response, cardiorespiratory fitness was categorized as: low (<85%), adequate (86% to 100%), and high (>100%). Impact of cardiorespiratory fitness gain was ascertained by the objective gain in fitness at final follow-up (≥2 METs vs. <2 METs). AF rhythm control was determined using 7-day Holter monitoring and AF severity scale questionnaire. RESULTS There were no differences in baseline characteristics or follow-up duration between the groups defined by cardiorespiratory fitness. Arrhythmia-free survival with and without rhythm control strategies was greatest in patients with high cardiorespiratory fitness compared to adequate or low cardiorespiratory fitness (p < 0.001 for both). AF burden and symptom severity decreased significantly in the group with cardiorespiratory fitness gain ≥2 METs as compared to <2 METs group (p < 0.001 for all). Arrhythmia-free survival with and without rhythm control strategies was greatest in those with METs gain ≥2 compared to those with METs gain <2 in cardiorespiratory fitness (p < 0.001 for both). CONCLUSIONS Cardiorespiratory fitness predicts arrhythmia recurrence in obese individuals with symptomatic AF. Improvement in cardiorespiratory fitness augments the beneficial effects of weight loss. (Evaluating the Impact of a Weight Loss on the Burden of Atrial Fibrillation [AF] in Obese Patients; ACTRN12614001123639).
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Tan YI, Metwaly M, Glegg M, Baggarley SP, Elliott A. A dual two dimensional electronic portal imaging device transit dosimetry model based on an empirical quadratic formalism. Br J Radiol 2015; 88:20140645. [PMID: 25969867 DOI: 10.1259/bjr.20140645] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE This study describes a two dimensional electronic portal imaging device (EPID) transit dosimetry model that can predict either: (1) in-phantom exit dose, or (2) EPID transit dose, for treatment verification. METHODS The model was based on a quadratic equation that relates the reduction in intensity to the equivalent path length (EPL) of the attenuator. In this study, two sets of quadratic equation coefficients were derived from calibration dose planes measured with EPID and ionization chamber in water under reference conditions. With two sets of coefficients, EPL can be calculated from either EPID or treatment planning system (TPS) dose planes. Consequently, either the in-phantom exit dose or the EPID transit dose can be predicted from the EPL. The model was tested with two open, five wedge and seven sliding window prostate and head and neck intensity-modulated radiation therapy (IMRT) fields on phantoms. Results were analysed using absolute gamma analysis (3%/3 mm). RESULTS The open fields gamma pass rates were >96.8% for all comparisons. For wedge and IMRT fields, comparisons between predicted and TPS-computed in-phantom exit dose resulted in mean gamma pass rate of 97.4% (range, 92.3-100%). As for the comparisons between predicted and measured EPID transit dose, the mean gamma pass rate was 97.5% (range, 92.6-100%). CONCLUSION An EPID transit dosimetry model that can predict in-phantom exit dose and EPID transit dose was described and proven to be valid. ADVANCES IN KNOWLEDGE The described model is practical, generic and flexible to encourage widespread implementation of EPID dosimetry for the improvement of patients' safety in radiotherapy.
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Tan Y, Metwaly M, Glegg M, Baggarley S, Elliott A. PO-0848: A dual 2D EPID transit dosimetry model for actual treatment verification. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40840-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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76
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Duceppe MA, Elliott A, Para M, Poirier MC, Delisle M, Frenette AJ, Deckelbaum D, Razek T, Desjardins M, Bertrand JC, Bernard F, Rico P, Burry L, Williamson D, Perreault MM. Modifiable risk factors for delirium in critically ill trauma patients: a multicenter prospective study. Crit Care 2015. [PMCID: PMC4470827 DOI: 10.1186/cc14558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Elliott A, La Gerche A. Author response. Br J Sports Med 2014; 49:1025-6. [PMID: 25527704 DOI: 10.1136/bjsports-2014-094441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/20/2014] [Indexed: 11/04/2022]
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Mpairwe H, Tweyongyere R, Elliott A. Pregnancy and helminth infections. Parasite Immunol 2014; 36:328-37. [PMID: 24471654 PMCID: PMC4260141 DOI: 10.1111/pim.12101] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 01/22/2014] [Indexed: 01/13/2023]
Abstract
It has been proposed that helminth infection may be particularly detrimental during pregnancy, through adverse effects on maternal anaemia and on birth outcomes, and that anthelminthic treatment during pregnancy will therefore be particularly beneficial. However, the few treatment trials that have been conducted have given, but little support to this notion and further trials in settings of nutritional stress are needed. It has also been proposed that prenatal exposure to helminth infection has an important effect on the development of the foetal immune response. There is evidence that this may impact, long-term, upon responses to helminth and nonhelminth antigens, and to allergens. Exposure to helminths in utero may also have nonspecific effects that may modify the offspring's susceptibility to diseases mediated by inflammation, including metabolic disorders. The mechanisms of such effects are not known, but they deserve to be explored as current epidemiological findings suggest the possibility of primary prevention for inflammatory conditions such as allergy, through intervention during pregnancy.
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Tan Y, Metwaly M, Glegg M, Baggarley S, Elliott A. SU-E-T-05: A 2D EPID Transit Dosimetry Model Based On An Empirical Quadratic Formalism. Med Phys 2014. [DOI: 10.1118/1.4888334] [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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Palmer S, Barney L, Bailey S, Barker L, Elliott A. FRI0595-HPR The effects of therapeutic exercise on joint hypermobility syndrome: a systematic review. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.1722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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81
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Fuentes D, Elliott A, Weinberg JS, Shetty A, Hazle JD, Stafford RJ. An inverse problem approach to recovery of in vivo nanoparticle concentrations from thermal image monitoring of MR-guided laser induced thermal therapy. Ann Biomed Eng 2012; 41:100-11. [PMID: 22918665 DOI: 10.1007/s10439-012-0638-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Accepted: 08/04/2012] [Indexed: 12/15/2022]
Abstract
Quantification of local variations in the optical properties of tumor tissue introduced by the presence of gold-silica nanoparticles (NP) presents significant opportunities in monitoring and control of NP-mediated laser induced thermal therapy (LITT) procedures. Finite element methods of inverse parameter recovery constrained by a Pennes bioheat transfer model were applied to estimate the optical parameters. Magnetic resonance temperature imaging (MRTI) acquired during a NP-mediated LITT of a canine transmissible venereal tumor in brain was used in the presented statistical inverse problem formulation. The maximum likelihood (ML) value of the optical parameters illustrated a marked change in the periphery of the tumor corresponding with the expected location of NP and area of selective heating observed on MRTI. Parameter recovery information became increasingly difficult to infer in distal regions of tissue where photon fluence had been significantly attenuated. Finite element temperature predictions using the ML parameter values obtained from the solution of the inverse problem are able to reproduce the NP selective heating within 5 °C of measured MRTI estimations along selected temperature profiles. Results indicate the ML solution found is able to sufficiently reproduce the selectivity of the NP mediated laser induced heating and therefore the ML solution is likely to return useful optical parameters within the region of significant laser fluence.
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Bruhn H, Blyth A, Elliott A, Hannaford P, Holland R, Lee A, MacNamee P, Smith B, Watson M, Wright D, Bond C. Pharmacist-led management of chronic pain in primary care: The PIPPC study. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.143586.30] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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83
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Elliott A, Hull JH, Nunan D, Jakovljevic DG, Brodie D, Ansley L. Application of bioreactance for cardiac output assessment during exercise in healthy individuals. Eur J Appl Physiol 2010; 109:945-51. [DOI: 10.1007/s00421-010-1440-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/10/2010] [Indexed: 10/19/2022]
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Dhesi S, Rajendram R, Elliott A. Realignment of a previously dislocated intraocular lens with a secondary intraocular lens: a rare cause of severe myopia. Eye (Lond) 2009; 24:1111. [PMID: 19942942 DOI: 10.1038/eye.2009.277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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85
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Boyd T, Wright C, Colby K, Sens M, Elliott A, Folkerth R, Kinney H, Odendaal H. O139 PASS stillbirth classification: Incorporating mechanism, etiology and recurrence. Prenatal alcohol stillbirth and SIDS (PASS) network, NIAAA/NICHD. Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)60511-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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86
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Fuentes D, Oden JT, Diller KR, Hazle JD, Elliott A, Shetty A, Stafford RJ. Computational modeling and real-time control of patient-specific laser treatment of cancer. Ann Biomed Eng 2009; 37:763-82. [PMID: 19148754 PMCID: PMC4064943 DOI: 10.1007/s10439-008-9631-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Accepted: 12/22/2008] [Indexed: 10/21/2022]
Abstract
An adaptive feedback control system is presented which employs a computational model of bioheat transfer in living tissue to guide, in real-time, laser treatments of prostate cancer monitored by magnetic resonance thermal imaging. The system is built on what can be referred to as cyberinfrastructure-a complex structure of high-speed network, large-scale parallel computing devices, laser optics, imaging, visualizations, inverse-analysis algorithms, mesh generation, and control systems that guide laser therapy to optimally control the ablation of cancerous tissue. The computational system has been successfully tested on in vivo, canine prostate. Over the course of an 18 min laser-induced thermal therapy performed at M.D. Anderson Cancer Center (MDACC) in Houston, Texas, the computational models were calibrated to intra-operative real-time thermal imaging treatment data and the calibrated models controlled the bioheat transfer to within 5 degrees C of the predetermined treatment plan. The computational arena is in Austin, Texas and managed at the Institute for Computational Engineering and Sciences (ICES). The system is designed to control the bioheat transfer remotely while simultaneously providing real-time remote visualization of the on-going treatment. Post-operative histology of the canine prostate reveal that the damage region was within the targeted 1.2 cm diameter treatment objective.
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87
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Wong R, Rajendram R, Sim D, Elliott A. Alports syndrome: a cause of Horner's syndrome due to internal carotid dissection? CASE REPORTS 2009; 2009:bcr06.2008.0171. [DOI: 10.1136/bcr.06.2008.0171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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88
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Langlands A, Dowdle R, Elliott A, Gaddie J, Graham A, Johnson G, Lam S, McGowan A, McNamee P, Morrison J, Murphy T, Reynard K, Rudge P, Trueland J. RCPE UK Consensus Statement on Acute Medicine, November 2008. Br J Hosp Med (Lond) 2009; 70:S6-S7. [PMID: 19522112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
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89
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Springer A, Shetty A, Elliott A, Paquet M, Wang J, Scwartz J, Hazle J, Stafford R. SU-GG-J-136: Nanoshell-Mediated Laser Induced Thermal Therapy in An In Vivo Model. Med Phys 2008. [DOI: 10.1118/1.2961685] [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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90
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Elliott A, Scwartz J, Wang J, Shetty A, O'Neal D, Bourgoyne C, Hazle J, Stafford R. TU-FF-A4-04: Comparison of Optical Diffusion Approximation and Delta P1 Approximation Models for Laser Fluence in Cancer Treatment. Med Phys 2008. [DOI: 10.1118/1.2962659] [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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91
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Shetty A, Weinberg J, McNichols R, Gowda A, Klumpp S, Uthamanthil R, Borne A, Elliott A, Hazle J, Stafford R. SU-GG-J-152: Predictive Capabilities of Thermal Damage Model for Real Time MR Monitored Interstitial Laser Treatment in a Canine Brain Model. Med Phys 2008. [DOI: 10.1118/1.2961701] [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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92
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Archibald G, Bartlett W, Brown A, Christie B, Elliott A, Griffith K, Pound S, Rappaport I, Robertson D, Semple Y, Slane P, Whitworth C, Williams B. UK Consensus Conference on Early Chronic Kidney Disease--6 and 7 February 2007. Nephrol Dial Transplant 2007; 22:2455-7. [PMID: 17557775 DOI: 10.1093/ndt/gfm268] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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93
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Stewart KJ, Elliott A, Seuntjens JP. Development of a guarded liquid ionization chamber for clinical dosimetry. Phys Med Biol 2007; 52:3089-104. [PMID: 17505091 DOI: 10.1088/0031-9155/52/11/011] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Liquid ionization chambers are considered superior to air-filled chambers in terms of size, energy dependence and perturbation effects. We constructed and tested a liquid ionization chamber for clinical dosimetry, the GLIC-03, with a sensitive volume of approximately 2 mm3. We also examined two methods to correct for general ion recombination in pulsed photon beams: that of Johansson et al, which modifies Boag's theory for recombination in gases, and an empirical method relating recombination to dose per pulse. The second method can be used even in cases where the first method is not applicable. The response of the GLIC-03 showed a stable, linear and reproducible decrease of 1% over 10 h. The liquid-filled GLIC-03 had a 1.1 +/- 0.4% energy dependence while that of the air-filled GLIC-03 was 2.1 +/- 0.3% between the 6 and 18 MV beams from a Clinac 21EX. The two methods for recombination correction agreed within 0.2% for measurements at 18 MV, 700 V, 100 MU min(-1). Measurements with the GLIC-03 in Solid Water in the build-up region of an 18 MV beam agreed with extrapolation chamber measurements within 1.4%, indicating that the GLIC-03 causes minimal perturbation.
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94
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Elliott A. Infra-red spectroscopy as an aid to the investigation of polypeptide and protein structure. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/jctb.5010060805] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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95
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Oden JT, Diller KR, Bajaj C, Browne JC, Hazle J, Babuška I, Bass J, Biduat L, Demkowicz L, Elliott A, Feng Y, Fuentes D, Prudhomme S, Rylander MN, Stafford RJ, Zhang Y. Dynamic Data-Driven Finite Element Models for Laser Treatment of Cancer. NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS 2007; 23:904-922. [PMID: 20376194 PMCID: PMC2850081 DOI: 10.1002/num.20251] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Elevating the temperature of cancerous cells is known to increase their susceptibility to subsequent radiation or chemotherapy treatments, and in the case in which a tumor exists as a well-defined region, higher intensity heat sources may be used to ablate the tissue. These facts are the basis for hyperthermia based cancer treatments. Of the many available modalities for delivering the heat source, the application of a laser heat source under the guidance of real-time treatment data has the potential to provide unprecedented control over the outcome of the treatment process [7, 18]. The goals of this work are to provide a precise mathematical framework for the real-time finite element solution of the problems of calibration, optimal heat source control, and goal-oriented error estimation applied to the equations of bioheat transfer and demonstrate that current finite element technology, parallel computer architecture, data transfer infrastructure, and thermal imaging modalities are capable of inducing a precise computer controlled temperature field within the biological domain.
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96
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Elliott A. Some uses of polarized infrared radiation in the spectroscopy of polymers. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/polc.5070070105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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97
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Lakshmanan P, Geijskes RJ, Wang L, Elliott A, Grof CPL, Berding N, Smith GR. Developmental and hormonal regulation of direct shoot organogenesis and somatic embryogenesis in sugarcane (Saccharum spp. interspecific hybrids) leaf culture. PLANT CELL REPORTS 2006; 25:1007-15. [PMID: 16847629 DOI: 10.1007/s00299-006-0154-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2006] [Accepted: 02/08/2006] [Indexed: 05/10/2023]
Abstract
Rapid and efficient in vitro regeneration methods that minimise somaclonal variation are critical for the genetic transformation and mass propagation of commercial varieties. Using a transverse thin cell layer culture system, we have identified some of the developmental and physiological constraints that limit high-frequency regeneration in sugarcane leaf tissue. Tissue polarity and consequently the orientation of the explant in culture, size and developmental phase of explant, and auxin concentration play a significant role in determining the organogenic potential of leaf tissue in culture. Both adventitious shoot production and somatic embryogenesis occurred on the proximal cut surface of the explant, and a regeneration gradient, decreasing gradually from the basal to the distal end, exists in the leaf roll. Importantly, auxin, when added to the culture medium, reduced this spatial developmental constraint, as well as the effect of genotype on plant regeneration. Transverse sections (1-2 mm thick) obtained from young leaf spindle rolls and orienting explants with its distal end facing the medium (directly in contact with medium) are critical for maximum regeneration. Shoot regeneration was observed as early as 3 weeks on MS medium supplemented with alpha-naphthalenencetic acid (NAA) and 6-benzyladenine, while somatic embryogenesis or both adventitious shoot organogenesis and somatic embryogenesis occurred on medium with NAA and chlorophenoxyacetic acid. Twenty shoots or more could be generated from a single transverse section explant. These shoots regenerated roots and successfully established after transplanted to pots. Large numbers of plantlets can be regenerated directly and rapidly using this system. SmartSett, the registered name for this process and the plants produced, will have significant practical applications for the mass propagation of new cultivars and in genetic modification programs. The SmartSett system has already been used commercially to produce substantial numbers of plants of orange rust-resistant and new cultivars in Australia.
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98
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Elliott A, Stewart K, Seuntjens J. Sci-Sat AM (1) General-08: Study of Characteristics of a New Liquid Ionization Chamber. Med Phys 2006. [DOI: 10.1118/1.2244695] [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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99
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Elliott A, Stewart K, Seuntjens J. TU-C-224C-01: Investigation of Properties of a New Liquid Ionization Chamber. Med Phys 2006. [DOI: 10.1118/1.2241536] [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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100
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Shetty A, Stafford R, Esparza-Coss E, Elliott A, Hazle J. SU-FF-J-72: Growth and Initial Area Under Curve Correlation Data From DCE-MRI For Treatment Planning and Monitoring in Orthotopic Tumor Models. Med Phys 2006. [DOI: 10.1118/1.2240849] [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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