Measurement of the Effect of Sildenafil Citrate (Viagra) on the Hemodynamics of Exercise Tolerance in Advanced Congestive Heart Failure.
Measurement of the Effect of Sildenafil Citrate (Viagra) on the Hemodynamics of Exercise Tolerance in Advanced Congestive Heart Failure.
The purpose of this study is to determine if sildenafil (Viagra) improves exercise tolerance.
Patients will undergo an exercise stress test. One dose of Sildenafil will then be given, followed by a one hour rest period. A repeat exercise stress test will then be repeated.
Inclusion Criteria:
Age 18 - 75 Ejection fraction <35% Heart failure limited by fatigue and shortness of breath -
Exclusion Criteria:
Inability to exercise. Patients with shortness of breath while resting. Patient requiring intravenous medication. Patients taking the following medications: nitroglycerine pill/patch/paste, isordil and Imdur
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