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The beneficial effects of spironolactone in chronic heart failure (HF) have been demonstrated in patients with New York Heart Association (NYHA) class III to IV HF. This study examined the effect of spironolactone on left ventricular (LV) function and functional capacity of patients with mild to moderate HF (NYHA class I to II). One hundred sixty-eight patients with NYHA class I to II HF and LV ejection fraction ≤40% were randomized to spironolactone or placebo and assessed by echocardiography, gated single-photon emission computed tomography, technetium-99m sestamibi single-photon emission computed tomographic radionuclide ventriculography, and cardiopulmonary exercise testing at baseline and after 6 months of treatment. In the spironolactone group LV ejection fraction increased from 35.2 ± 0.7% to 39.1 ± 3.5% (p <0.001), with a decrease in LV end-diastolic and end-systolic volumes and myocardial …