electrocardiogram; LVEDV, left ventricular end-diastolic volume; LVEF, left ventricular ejection fraction; NT pro-BNP, N-terminal pro–B-type natriuretic peptide; NYHA, New York Heart Association; RVEDV, right ventricular end-diastolic volume; RVEF, right ventricular ejection fraction; VO2 = oxygen...