Pressure response in Chagasic cardiomyopathy patients after using Sildenafil

Area of Science:

• Cardiology
• Pharmacology

Background:

• Chagasic myocardiopathy (CMC) often leads to severe systolic ventricular dysfunction (ejection fraction <40%).
• Physical activity impacts hemodynamics in patients with heart failure.

Purpose of the Study:

• To evaluate the effect of Sildenafil on blood pressure (BP) and heart rate (HR) during physical activity in CMC patients with severe systolic dysfunction.
• To assess the clinical safety of Sildenafil in this patient population.

Main Methods:

• Twelve male patients with CMC and ejection fraction <40% underwent a six-minute walk test (6MWT).
• Hemodynamic parameters (BP, HR) were measured before and after Sildenafil administration (50 mg) and the 6MWT.
• Data were analyzed across four stages: baseline, post-6MWT, post-Sildenafil, and post-Sildenafil with 6MWT.

Main Results:

• Systolic and diastolic BP were significantly lower after Sildenafil and 6MWT compared to baseline.
• No significant differences were observed in 6MWT distance or heart rate.
• No adverse symptoms were reported by patients during the 6MWT.

Conclusions:

• Sildenafil administration resulted in a significant reduction in blood pressure following physical activity in CMC patients.
• The observed BP reduction was not associated with clinical symptoms during the 6MWT.
• Sildenafil appears to be safe and does not cause adverse clinical manifestations in CMC patients with heart failure during exercise.