To the Editor: In their analysis of factors associated with exercise capacity, Dr Grewal and colleagues1 identified abnormalities of left ventricular diastolic function as a factor independent of other echocardiographic factors. However, the authors appear to have omitted left ventricular mass and left ventricular hypertrophy as one of the echocardiographic variables in their multivariate analysis.
Gharavi A, Diamond JA, Phillips RA. Exercise Capacity and Left Ventricular Function. JAMA. 2009;301(22):2325-2327. doi:10.1001/jama.2009.697