A 63-year-old female patient presents to the emergency department with symptoms of syncope and exertional chest discomfort. Her medical history is significant for scleroderma. An echocardiogram reveals right ventricular hypertrophy and increased pulmonary artery pressures. Which initial treatment strategy would be MOST appropriate for this patient with suspected pulmonary hypertension?
Start diuretic therapy and oxygen supplementation alone.
Prescribe empiric antibiotics while awaiting further studies.
Initiate an endothelin receptor antagonist.
Begin treatment with a calcium channel blocker.