collateral circulation
Alternative blood flow pathways that develop to bypass significant coronary artery stenosis or occlusion.
Full Definition
Collateral circulation refers to the network of small arteries and arterioles that can enlarge and provide alternative blood flow routes when major coronary arteries are severely stenosed or occluded. This compensatory mechanism develops through arteriogenesis and angiogenesis in response to chronic ischemia. Collateral circulation can be visualized during coronary angiography and is graded using various classification systems. Well-developed collaterals can provide significant protection against myocardial infarction and improve patient outcomes, making their assessment important in treatment planning.
Usage
Usage note: Specify the grading system used (e.g., Rentrop classification) when documenting collateral flow.
In Context
- "Excellent collateral circulation to the right coronary artery territory was demonstrated via left-to-right connections." — Coronary angiography report
- "The presence of robust collateral circulation may explain the patient's absence of symptoms despite total occlusion." — Clinical correlation note