Genetic Risk Assessment of Defibrillator Events

NCT ID: NCT02045043


Title
Genetic Risk Assessment of Defibrillator Events: A Prospective Multicenter Observational Study
Purpose
Arrhythmias remain a major health problem, causing at least 250,000 deaths annually in the United States. Pharmacological treatments often do more harm than good, and device therapies are limited by high cost and effects on quality of life. Ion channel mutations cause rare inherited arrhythmopathies, but account for only a small fraction of patients with life- threatening arrhythmias and sudden death. Most arrhythmias occur during myocardial ischemia, following myocardial infarction, and in patients with poor left ventricular (LV) function of any etiology. Aside from ejection fraction (EF), few clinically useful indicators to stratify the risk of sudden death have been identified. The role of subtle difference in ion channel expression and/or structure in predisposing patients to arrhythmias and modulating the risk of sudden death is unknown. In this study, we are prospectively testing whether polymorphisms in ion channels and ion channel modifying genes are associated with arrhythmias in a population with internal cardioverter-defibrillators (ICDs) and poor LV function. We will test the hypothesis that functional polymorphisms in the coding sequences and promoter regions of cardiac genes (e.g. ion channels, beta-adrenergic receptors) predispose individuals to arrhythmias and /or heart failure progression. We hope to identify genetic predictors for the common forms of sudden cardiac death. This would allow the identification of a subpopulation of heart failure patients that would benefit most from ICD placement.
Details
Conditions
Sudden Cardiac Death, Arrhythmias, Congestive Heart Failure, Cardiomyopathy
Keywords
Sudden Cardiac Death, Arrhythmias, Congestive Heart Failure, Cardiomyopathy, Single Nucleotide Polymorphisms, Genomics
Source
University of Iowa
Sponsors
University of Iowa, National Heart, Lung, and Blood Institute (NHLBI)
Status
Completed
Acronym
GRADE
Last Updated
21 Jan 2014
URL
Official Link
Citations/Publications
Refaat MM, Lubitz SA, Makino S, Islam Z, Frangiskakis JM, Mehdi H, Gutmann R, Zhang ML, Bloom HL, MacRae CA, Dudley SC, Shalaby AA, Weiss R, McNamara DM, London B, Ellinor PT. Genetic variation in the alternative splicing regulator RBM20 is associated with dilated cardiomyopathy. Heart Rhythm. 2012 Mar;9(3):390-6. doi: 10.1016/j.hrthm.2011.10.016.

Blanco RR, Austin H, Vest RN 3rd, Valadri R, Li W, Lassegue B, Song Q, London B, Dudley SC, Bloom HL, Searles CD, Zafari AM. Angiotensin receptor type 1 single nucleotide polymorphism 1166A/C is associated with malignant arrhythmias and altered circulating miR-155 levels in patients with chronic heart failure. J Card Fail. 2012 Sep;18(9):717-23. doi: 10.1016/j.cardfail.2012.06.531.

Bloom HL, Shukrullah I, Veledar E, Gutmann R, London B, Dudley SC. Statins Decrease Oxidative Stress and ICD Therapies. Cardiol Res Pract. 2010;2010:253803. doi: 10.4061/2010/253803.

Locations
United States