collateral circulation
Alternative vascular pathways that develop to maintain blood flow around blocked coronary arteries, influencing intervention timing and technique.
Full Definition
Collateral circulation consists of pre-existing or newly developed vascular connections that provide alternative blood flow pathways when primary coronary arteries become severely stenotic or occluded. These collaterals can be intramyocardial, epicardial, or bridging connections between different coronary territories. The presence and adequacy of collateral circulation significantly influence clinical presentation, myocardial viability, and procedural planning for interventions. Well-developed collaterals may protect against ischemia during chronic total occlusion interventions but can also complicate wire crossing and increase procedural complexity. Assessment of collateral circulation helps determine intervention urgency and approach.
Usage
Usage note: Avoid confusing with surgically created bypass grafts, which are external conduits.
In Context
- "Robust collateral circulation to the posterior descending artery was noted on angiography." — Angiographic interpretation
- "The patient's preserved left ventricular function was attributed to adequate collateral circulation." — Clinical assessment