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circulation maintained in small anastomosing vessels when the main vessel is obstructed.
Farlex Partner Medical Dictionary © Farlex 2012
collateral circulationCardiology Blood flow that pursues a channel or system of vessels that is alternative to, or develops in substitution for, a major vascular pathway
Collateral circulation coronary artery
Grade 0 No flow in the collateral
Grade 1 Collateral is barely apparent; dye is present in at least 3 consecutive frames
Grade 2 Collateral is moderately opaque but present throughout at ≥ 75% of the cardiac cycle; there is antegrade motion of the dye rather than diffuse filling.
Grade 3 Collateral is well opacified and the column of dye is well defined–ie, > 0.5 mm in diameter, but < 0.7 mm wide over majority of length; collateral has clear antegrade dye motion
Grade 4 Collateral is well opacified, fills antegrade, and is very large; > 0.7 mm in diameter over entire length (Am Heart J 1999; 137:169)
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
col·lat·er·al cir·cu·la·tion(kŏ-lat'ĕr-ăl sĭr'kyū-lā'shŭn)
Circulation maintained in small anastomosing vessels when the main vessel is obstructed.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
collateral circulationThe opening up of small shunting vessels around the site of blockage of an artery that helps to compensate for the loss of direct blood supply.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005