Learning About PPH

With PPH, for unknown reasons, some of the endothelial cell lining of the lung's capillaries get peeled off. As blood leaks into the smooth muscle cells they continuously constrict as a reaction. Multiplied thousands of times this chokes off the flow of blood between the heart and lungs, causing dizziness exhaustion, fainting and finally heart failure.

Generally speaking, your doctor should follow the PPH  management algorithm developed by Dr. Rubin and Rich (Source: Lewis J. Rubin & Stuart Rich, Primary Pulmonary Hypertension 1997)