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 42-year-old man comes to the physician because of a 6-month history of progressively worsening shortness of breath with exertion. He was diagnosed with systemic sclerosis 5 years ago. Vital signs are within normal limits. Physical examination shows puffy, taut skin over the fingers. Pulmonary examination is unremarkable. There is no jugular venous distention. An x-ray of the chest shows enlargement of the pulmonary vessels and a prominent right heart border. Cardiac catheterization shows elevated right ventricular pressures and a mean pulmonary artery pressure of 55 mm Hg. Treatment with tadalafil is begun. The expected beneficial effect of this drug is most likely due to which of the following actions?
assistant
Enhanced activity of nitric oxide