Dr. Nallamothu is a cardiologist and health services researcher. He practices interventional and critical care cardiology. His research is focused on population-based studies that incorporate the use of large claims data and clinical registries to understand optimal patterns of cardiovascular care delivery. He has worked extensively in the area of heart attack care and sudden cardiac death. He has received funding for his work from the National Heart, Lung and Blood Institute, the Agency for Healthcare Research and Quality, and the Department of Veterans Affairs.