IPAH Pt.4

To provide some context:
Idiopathic pulmonary arterial hypertension (IPAH) is a rare and incurable disease characterized by increased blood pressure in the arteries of the lungs, which forces the right side of the heart to work harder to pump blood against the increased pressure. IPAH often results in heart failure and death; the average prognosis of IPAH patients is only 2.8 years without treatment.