Idiopathic pulmonary hypertension looks to be a pretty rare disease? Is this true? I was looking up numbers online. How many people in us have it?

IPAH. The number of patients with idiopathic pulmonary arterial hypertension (ipah) is felt to be around 5, 000 in the United States based on a prevalence of 15 per million.
Fortunately yes. I had a patient who had a genetically determined defect in her brainstem that affected her automatic breathing. Pulmonary hypertension was found in studying her case. Thus this disease may involve brain metabolism at least in some cases. I do not have statistics on its occurrence.