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.
References in periodicals archive ?
Relation between preintervention angiographic evidence of coronary collateral circulation and clinical and angiographic outcomes after primary angioplasty or stenting for acute myocardial infarction.
Besides, although antegrade perfusion with axillary cannulation may be enough in the presence of a well-developed collateral circulation, more appropriate perfusion to the upper and lower parts of the body is presumably best accomplished by separate antegrade and retrograde cannulation.
Life-saving necklace: collateral circulation from the conus artery to the anterior descending artery.
The Development of Marked Collateral Circulation due to Inferior Vena Cava Filter Occlusion in a Patient with ChronicThromboembolic Pulmonary Hypertension Complicated with Anti-phospholipid Syndrome.
Between the deep pelvic veins that drain the urinary system and the prostate, and the internal vertebral veins lies a collateral circulation system.
Impact of Collateral Circulation on Survival in ST-Segment Elevation Myocardial Infarction Patients Undergoing Primary Percutaneous Coronary Intervention With a Concomitant Chronic Total Occlusion.
Such a high percentage of asymptomatic patients with stenosis of the mesenteric arteries can be connected with possible development of collateral circulation through anastomoses between the mesenteric arteries and celiac trunk.
Then, aortic root angiography showed the dilated RCA originating from the right coronary cusp (RCC), and delayed enhanced-imaging demonstrated the LCA filling via extensive intercoronary collateral circulation. Finally, PA angiography showed immediate filling of the LCA, which originated from the PA; then abundant collateral circulation and delayed RCA were imaged (Figure 2), confirming the diagnosis of ALCAPA.
While computed tomography (CT), MRI-angiography, or ultrasonography may be used as diagnostic tools, the gold standard for visualizing the collateral circulation network characteristic of moyamoya disease is conventional angiography.
Due to this finding, a peripheral CT angiogram was done for further evaluation of the arterial system which showed severe peripheral arterial disease including total occlusion of both common iliac arteries and 95% infrarenal aortic stenosis with collateral circulation (Figures 2(a) and 2(b)).

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