The SYNTAX Score has multiple components intended to demonstrate the complexity of coronary artery disease. A lesion at a bifurcation or trifurcation has additional points applied based on the number of branches involved.
Trifurcations (main vessel and 2 side branches)
(1) 3/4/16/16a
(2) 5/6/11/12
(3) 11/12a/12b/13
(4) 6/7/9/9a
(5) 7/8/10/10a
Parameter for Trifurcation:
(1) number of vessels affected (out of 4)
Number of Vessels Affected at the Trifurcation (out of 4)
Points
1
3
2
4
3
5
all 4
6
Bifurcations (main vessel with side branch >= 1.5 mm):
(1) 5/6/11
(2) 6/7/9
(3) 7/8/10
(4) 11/13/12a
(5) 13/14/14a
(6) 3/4/16
(7) 13/14/15
Parameters for bifurcation:
(1) involvement of side branch
(2) angulation between side branch and distal segment
Parameter
Finding
Points
involvement of side branch
no (Type A, B or C)
1
yes (Type D, E, F, G)
2
angulation
< 70°
1
>= 70°
0
points for bifurcation =
= (points for side branch involvement) + (points for angulation)
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