system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 70-year-old man comes to the physician for a follow-up examination of diffuse exertional chest pain which he has successfully been treating with sublingual nitroglycerin for the past year. The patient has been taking lisinopril daily for essential hypertension. His pulse is 75/min and regular, and blood pressure is 155/90 mm Hg. Cardiac and pulmonary examination show no abnormalities; there is no peripheral edema. A decrease of which of the following is the most likely explanation for the improvement of this patient's chest pain?
assistant
End-diastolic pressure