Her work has involved a broad range of research questions within the field of cardiovascular outcomes, primarily focused on QOL outcomes among patients with chronic coronary disease and valvular heart disease. She was awarded a career development grant from the NIH/NHLBI to study the heterogeneity of treatment effect in transcatheter aortic valve replacement, a novel procedure to replace the aortic valve percutaneously. Dr Arnold is board-certified in Internal Medicine, Cardiology, and Echocardiography. She has also received several awards including the Burton Sobel Award for Excellence in Cardiovascular Research at Washington University in St. Louis and the American Heart Association Young Investigator Award.