MCQ 17

A 52-year-old female with a past medical history of systemic scleroderma presents to a clinic with a recent 3-month history of shortness of breath, lightheadedness, and fatigue. On auscultation, a loud P2 sound is noted. An echocardiogram is performed, which reveals the increased thickness of the right ventricular wall, and a Swan-Ganz heart catheter shows right atrial pressure of 10 mmHg with an elevated mean pulmonary arterial pressure =25 mmHg. What is the mechanism of the first-line treatment for this condition?

A. Inhibition of dehydroepiandrosterone synthesis
B. Prostaglandin induced vasodilation of the pulmonary arteries
C. Stimulation of beta 2 receptors to decrease bronchospasm
D. Blockage of histamine synthesis
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