What is a significant coronary lesion?

A significant coronary lesion is a narrowing or blockage in a coronary artery that impairs blood flow to the heart muscle, typically defined as a stenosis of 70% or greater in a major artery or 50% or greater in the left main coronary artery. This level of obstruction can lead to ischemia, angina, or even myocardial infarction (heart attack) if not addressed. Identifying significant lesions is crucial for determining the need for interventions like angioplasty or coronary artery bypass grafting.