A 44-year-old man is brought to the ER due to retrosternal chest pain The patient describe the pain which develops with exertion and sometimes occur when resting. ECG shows no finding with normal cardiac markers. He does not use alcohol, tobacco, or illicit drugs The patient's father died with myocardial infarction. His temperature is 37.2 C blood pressure is 120/75 mm Hg, pulse is 78/min, and respirations are 14/min. Physical examination shows no abnormalities. Coronary angiography shows no significant obstructive lesions. Acetylcholine infusion during the procedure results in dilation of epicardial coronary vessels. A reaction involving which of the following amino acids is most likely responsible for the observed dilation?

Question

Quizplus · Accepted Answer

Eductional Objective: Nitric oxide is synthesized from arginine by nitric oxide synthase. As a precursor of nitric oxide, arginine supplementation may play an adjunct role in the treatment of conditions that improve with vasodilation, such as stable angina.

A 44-Year-Old Man Is Brought to the ER Due to Retrosternal