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?
Initiate an endothelin receptor antagonist.
Start diuretic therapy and oxygen supplementation alone.
Begin treatment with a calcium channel blocker.
Prescribe empiric antibiotics while awaiting further studies.