We plan to study the concept of "energy starvation" in heart failure by evaluation of patients with nonischemic dilated cardiomyopathy (NIDCM) (heart failure with reduced heart pump function due to causes other than heart attack). We will use a combination of positron emission tomography and magnetic resonance imaging to study metabolism, anatomy, function, blood flow and efficiency, before and after 6 months' treatment with the drug spironolactone which blocks the deleterious effects of the hormone aldosterone on the myocardium (heart muscle).
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Left Ventricular Work-metabolic Index (WMI) at Baseline
Timeframe: baseline
Left Ventricular Work-metabolic Index (WMI) at 6 Months
Timeframe: 6 months
Myocardial Perfusion Reserve Index (MPRI) by Magnetic Resonance Imaging at Baseline
Timeframe: baseline
Myocardial Perfusion Index Reserve (MPRI) by Magnetic Resonance Imaging at 6 Months
Timeframe: 6 months
Change in Myocardial Fibrosis (T1 Time) by Magnetic Resonance Imaging
Timeframe: baseline and 6 months