collateral circulation
Alternative coronary blood flow pathways that develop to bypass significant coronary artery obstructions.
Full Definition
Collateral circulation refers to the development of alternative vascular channels that provide blood flow to myocardial territories when the primary coronary artery supply is compromised by significant stenosis or occlusion. These collateral vessels may be pre-existing dormant channels that recruit and enlarge, or newly formed vessels through angiogenesis. Collateral circulation can develop gradually in chronic coronary disease or acutely during myocardial infarction. The extent and quality of collateral flow influence the severity of ischemia, infarct size, and clinical outcomes. Angiographic grading systems, such as the Rentrop classification, are used to assess collateral vessel adequacy during cardiac catheterization.
Usage
Usage note: Often graded using Rentrop classification; provides natural protection against ischemia.
In Context
- "Extensive collateral circulation from the left system supplied the occluded right coronary artery territory." — Cardiac catheterization report
- "The patient's preserved ventricular function despite total occlusion was attributed to robust collateral circulation." — Cardiology consultation note