To the Editor: Dr Grewal and colleagues1 assessed left ventricular diastolic function during exercise echocardiography in nonischemic patients with normal resting left ventricular function. The study demonstrated how resting left ventricular diastolic function parameters and exercise E/e′ predict functional capacity in these patients. However, 2 issues concern us.
Peteiro J, Bouzas-Mosquera A. Exercise Capacity and Left Ventricular Function. JAMA. 2009;301(22):2325-2327. doi:10.1001/jama.2009.696