Canrenone Effects on Cardiovascular Mortality in Patients With Congestive Heart Failure (the Coffee-it Study)

The investigators will verify patients with cardiac heart failure (CHF) and preserved systolic function and each patient must have all clinical evaluation through basal measurements of blood pressure, heart rate, biochemical tests, and color Doppler echocardiographic parameters for at least 12 years. The investigators will evaluate the effects of an aldosterone antagonist as canrenone compared to a group without canrenone and the investogators will verify how many patients reported cardiovascular mortality or will survive.