Pulmonary hypertension (PH) is a condition in which high blood pressure exists within the vessels of the lungs. Normally, venous (low oxygen) blood returns from the body to the right side of the heart where it is pumped to lungs via the pulmonary arteries. Breathing brings oxygen to venous blood in the lungs, turning it into arterial (high oxygen) blood. Arterial blood returns to the left side of the heart through the pulmonary veins where it is pumped to the rest of the body.

Click to open: Pulmonary Hypertension