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Randomized aldactone evolution study (RALES) and eplerenone post-AMI heart failure efficacy and survival study (EPHESUS) had shown that aldosterone blockade (AB) with standard therapy resulted in a reduction in mortality in patients with congestive heart failure (CHF) and acute myocardial infarction (AMI). However, the mechanism for the beneficial effect of AB remains unknown. To evaluate the effect of spironolactone (Spi) on left ventricular (LV) remodeling, 34 CHF patients with DCM were randomly divided into the Spi (+) or Spi (-) groups. Four months of treatment with Spi improved the LV volume and mass. To evaluate the effect of Spi on post-infarct LV remodeling, 134 patients with first anterior AMI were randomly divided into the Spi (+) or Spi (-) groups after revascularization. LV ejection fraction was significantly improved after 1 month in the Spi (+) group compared with that in the Spi (-) group. LV end-diastolic volume index was significantly suppressed in the Spi (+) group compared with that in the Spi (-) group. Transcardiac extraction of aldosterone through the heart was significantly suppressed in the Spi (+) group and was significant lower in the Spi (+) group compared with the Spi (-) group. These findings indicate that AB combined with standard therapy can prevent LV remodeling in patients with CHF and AMI, suggesting that the failing heart is the target organ of the aldosterone.

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Mineralocorticoid receptor antagonist spironolactone improves left ventricular remodeling in patients with congestive heart failure and acute myocardial infarction