collateral circulation
Alternative blood flow pathways that develop or enlarge to compensate for blocked or narrowed main vessels.
Full Definition
Collateral circulation refers to the network of alternative vascular pathways that naturally exist or develop to provide blood flow around areas of vascular obstruction or stenosis. These collateral vessels can be pre-existing but dormant pathways that enlarge in response to ischemic stimuli, or they may represent newly formed vessels through angiogenic processes. The development of robust collateral circulation can significantly influence clinical outcomes in patients with vascular disease by maintaining tissue perfusion despite major vessel compromise. Assessment of collateral circulation is important in treatment planning and prognosis, particularly in coronary artery disease, stroke, and peripheral arterial disease. The adequacy of collateral flow often determines symptom severity and tissue viability.
Usage
Usage note: Often used with qualifiers like 'adequate,' 'poor,' or 'extensive.'
In Context
- "Extensive collateral circulation protected the patient from myocardial infarction despite complete vessel occlusion." — Cardiology case report
- "Poor collateral circulation contributed to the severity of peripheral ischemic symptoms." — Vascular assessment report