Relation between Myocardial Blood Flow and the Severity of Coronary-Artery Stenosis

Abstract

In humans, basal myocardial blood flow remains constant regardless of the severity of coronary-artery stenosis. However, during hyperemia, flow progressively decreases when the degree of stenosis is about 40 percent or more and does not differ significantly from basal flow when stenosis is 80 percent or greater.