This is an application for a K23 award for Dr. Rajat Deo, who proposes the use of rigorous epidemiologic and biostatistical methods to understand the role of the renin-angiotensin-aldosterone system (RAAS) in cardiac arrhythmias among people with chronic kidney disease (CKD). This award will allow Dr. Deo the resources and protected time to achieve the following career development goals: (1) to become an independent, clinical researcher in the field of cardiorenal disease and arrhythmias;(2) to become an expert in the application of causal inference methodology and sub-clinical measures of disease;and (3) to develop expertise in the methods critical to the adjudication process and rigorous design of cohort studies. To achieve these goals, Dr. Deo has assembled a mentoring team comprised of his sponsor and primary mentor, Dr. Harold Feldman (Principal Investigator and Chair of the Steering Committee for the Chronic Renal Insufficiency Cohort [CRIC]), and two co-mentors, Dr. Michael Shlipak (an expert in the field of cardiovascular complications of kidney disease) and Dr. Marshall Joffe (a senior biostatistician). Recent data demonstrate that CKD is associated with an increased risk of atrial and ventricular arrhythmias;however, the mechanisms underlying this predisposition remain unknown. Activation of the RAAS may mediate the risk of arrhythmias in patients with CKD. RAAS activation can affect cardiac conduction through both structural remodeling processes and direct ion channel inhibition. These structural and electrophysiological changes may be the precursors to atrial and ventricular arrhythmias. No study has evaluated the role of aldosterone as a mediator of arrhythmia risk in CKD. Using data from the CRIC study, Dr. Deo will evaluate baseline aldosterone with kidney function, electrocardiographic intervals and markers of conduction system disease, and arrhythmia outcomes.
Three specific aims are proposed:
Aim 1 : To evaluate the association of kidney function with aldosterone concentrations in the CRIC study;
Aim 2 : To determine the cross-sectional and longitudinal associations of circulating aldosterone levels and kidney function with electrophysiological parameters of conduction system remodeling;
and Aim 3 : To determine the longitudinal associations of elevated aldosterone levels and reduced kidney function with atrial fibrillation and sudden cardiac death in CRIC.

Public Health Relevance

Atrial fibrillation and sudden cardiac death risks are increased in patients with CKD, a highly prevalent disease in the United States. An improved understanding of the mechanisms implicated in these conditions could lead to important interventions and therapies to prevent the catastrophic complications of arrhythmias.

National Institute of Health (NIH)
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Mentored Patient-Oriented Research Career Development Award (K23)
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Special Emphasis Panel (ZDK1-GRB-G (M2))
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Rankin, Tracy L
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University of Pennsylvania
Internal Medicine/Medicine
Schools of Medicine
United States
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Deo, Rajat; Yang, Wei; Khan, Abigail M et al. (2014) Serum aldosterone and death, end-stage renal disease, and cardiovascular events in blacks and whites: findings from the Chronic Renal Insufficiency Cohort (CRIC) Study. Hypertension 64:103-10
Magnani, Jared W; Wang, Na; Nelson, Kerrie P et al. (2013) Electrocardiographic PR interval and adverse outcomes in older adults: the Health, Aging, and Body Composition study. Circ Arrhythm Electrophysiol 6:84-90
Deo, R; Nalls, M A; Avery, C L et al. (2013) Common genetic variation near the connexin-43 gene is associated with resting heart rate in African Americans: a genome-wide association study of 13,372 participants. Heart Rhythm 10:401-8
Kapa, Suraj; Epstein, Andrew E; Callans, David J et al. (2013) Assessing arrhythmia burden after catheter ablation of atrial fibrillation using an implantable loop recorder: the ABACUS study. J Cardiovasc Electrophysiol 24:875-81
Deo, Rajat; Albert, Christine M (2012) Epidemiology and genetics of sudden cardiac death. Circulation 125:620-37
Mountantonakis, Stavros; Deo, Rajat (2012) Biomarkers in atrial fibrillation, ventricular arrhythmias, and sudden cardiac death. Cardiovasc Ther 30:e74-80
Deo, Rajat; Vittinghoff, Eric; Lin, Feng et al. (2011) Risk factor and prediction modeling for sudden cardiac death in women with coronary artery disease. Arch Intern Med 171:1703-9
Deo, Rajat; Katz, Ronit; Shlipak, Michael G et al. (2011) Vitamin D, parathyroid hormone, and sudden cardiac death: results from the Cardiovascular Health Study. Hypertension 58:1021-8