collateral circulation
Alternative vascular pathways that develop to bypass areas of arterial stenosis or occlusion.
Full Definition
Collateral circulation refers to the network of alternative vascular pathways that form naturally in response to arterial stenosis or occlusion, providing alternate routes for blood flow to reach target tissues. These vessels may be pre-existing but enlarged, or newly formed through angiogenesis. Collateral development is influenced by the severity and chronicity of the stenosis, with gradually progressive occlusions typically allowing better collateral formation than acute occlusions. Assessment of collateral circulation is crucial in vascular imaging as it affects clinical symptoms, prognosis, and treatment planning. Good collateral circulation may protect against ischemia and influence the urgency of revascularization procedures.
Usage
Usage note: Describe adequacy and routes when clinically significant.
In Context
- "Extensive collateral circulation was evident despite complete occlusion of the superficial femoral artery." — Peripheral vascular assessment
- "The patient's excellent collateral circulation explained the lack of symptoms." — Vascular surgery consultation