Main pulmonary artery diameter is a prognostic indicator in patients with pulmonary arterial hypertension without congenital heart disease.

The pulmonary artery carries deoxygenated blood away from the right ventricle to the lungs. The pulmonary vein returns oxygenated blood from the lungs to the heart.

All blood vessels are specifically structured to perform their function. For example, a capillary is microscopically thin to allow gases to exchange, the arteries are tough and flexible to cope ...

A larger diameter of the main pulmonary artery predicts poorer outcomes in pulmonary arterial hypertension (PAH) patients, a study found.

Pulmonary arterial hypertension is caused by narrowing of the blood vessels in the lungs. Learn how it happens, including ...