collateral circulation

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col·lat·er·al cir·cu·la·tion

circulation maintained in small anastomosing vessels when the main vessel is obstructed.

collateral circulation

Cardiology 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)

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.

collateral circulation

The 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.
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