| 释义 |
Collateral circulation
| (Med. & Physiol.) | circulation established through indirect or subordinate branches when the supply through the main vessel is obstructed. |
See also: Collateral collateral circulation
collateral circulation[kə¦lad·ə·rəl ‚sər·kyə′lā·shən] (physiology) The circulation established for an organ or a part of an organ through the intercommunication of blood vessels when the original direct blood supply is obstructed or abolished. collateral circulation
col·lat·er·al cir·cu·la·tioncirculation 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.FinancialSeecollateralThesaurusSeeanastomosis |