He needed a stent to keep the artery open and blood flowing. But when his doctor tried to place it, he couldn't. Matt's ...

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

Matt's artery turned out to be 99.9% blocked. He'd long been at risk for a possibly fatal heart attack. Following the failed procedure, doctors explained to Matt what had happened. "But I ran 3 ...