collateral circulation
Alternative blood flow pathways that develop to bypass occluded coronary arteries, providing blood supply to ischemic myocardium.
Full Definition
Coronary collateral circulation consists of pre-existing intercoronary connections that can enlarge and develop when a coronary artery becomes severely stenotic or occluded. These collateral vessels serve as natural bypasses, potentially preserving myocardial viability and reducing infarct size during acute coronary events. Collateral development is influenced by the severity and duration of ischemia, genetic factors, and presence of repeated ischemic episodes. Well-developed collaterals can be protective against sudden cardiac death and may influence decisions regarding revascularization strategies. Angiographic grading systems, such as the Rentrop classification, are used to assess collateral flow adequacy.
Usage
Usage note: Often graded using Rentrop classification (0-3) in angiographic reports.
In Context
- "Angiography revealed well-developed collateral circulation supplying the right coronary artery territory via left anterior descending connections." — Cardiac catheterization report
- "The patient's preserved left ventricular function despite chronic total occlusion was attributed to robust collateral circulation." — Interventional cardiology consultation