Rentrop et al graded the degree of collateral channel filling from a contralateral coronary artery as seen on coronary angiography.
Patient selection: severe atherosclerotic coronary artery disease
Method - coronary angiography with:
(1) the target artery occluded by an angioplasty balloon and
(2) dye injected into the contralateral coronary artery via a second catheter
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Filling from Contalateral Artery
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Grade
|
|
none
|
0
|
|
filling of side branches via collateral channels but without visualization of the epicardial segment
|
1
|
|
partial filling of the epicardial segment
|
2
|
|
complete filling of epicardial segment of artery
|
3
|
This can be restated:
|
Collateral Filling of Side Branches from the Contralateral Artery
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Filling of Distal Epicardial Segment of the Culprit Artery
|
Grade
|
|
none
|
none
|
0
|
|
present
|
none
|
1
|
|
present
|
partial
|
2
|
|
present
|
complete
|
3
|
