The SYNTAX score has a number of components that reflect the complexity of coronary artery disease. The basic score involves the location of the lesion in a coronary artery and the extent of involvement.
Patient selection: coronary artery disease, before and after coronary artery bypass grafts (CABG)
Steps:
(1) Determine whether the left or right coronary artery is dominant.
(2) Identify the location of the lesion in a coronary artery segment.
(3) Determine the degree of stenosis for the lesion.
(3a) A lesion less than 50% is not considered significant and so is weighted x0.
(3b) A lesion with 50 to 99% occlusion is weighted x2.
(3c) A lesion with 100% (complete) occlusion is weighted x5
points for the lesion =
= (points for segment read from table) * (weighting factor)
Right Coronary Artery Dominance
|
Segment |
Name |
Points |
|---|---|---|
|
1 |
RCA proximal |
1 |
|
2 |
RCA mid |
1 |
|
3 |
RCA distal |
1 |
|
4 |
Posterior Descending |
1 |
|
16 |
Posterolateral branch from RCA |
0.5 |
|
16a |
Posterolateral branch from RCA |
0.5 |
|
16b |
Posterolateral branch from RCA |
0.5 |
|
16c |
Posterolateral branch from RCA |
0.5 |
|
5 |
Left main |
5 |
|
6 |
LAD proximal |
3.5 |
|
7 |
LAD mid |
2.5 |
|
8 |
LAD apiucal |
1 |
|
9 |
First diagonal |
1 |
|
9a |
First diagonal |
1 |
|
10 |
Second diagonal |
0.5 |
|
10a |
Second diagonal |
0.5 |
|
11 |
Proximal circumflex |
1.5 |
|
12 |
Intermediate or anterolateral |
1 |
|
12a |
Obtuse marginal |
1 |
|
12b |
Obtuse marginal |
1 |
|
13 |
Distal circumflex |
0.5 |
|
14 |
Left posterolateral |
0.5 |
|
14a |
Left posterolateral |
0.5 |
|
14b |
Left posterolateral |
0.5 |
|
15 |
Posterior descending |
n.a. |
Left Coronary Artery Dominance
|
Segment |
Name |
Points |
|---|---|---|
|
1 |
RCA proximal |
0 |
|
2 |
RCA mid |
0 |
|
3 |
RCA distal |
0 |
|
4 |
Posterior Descending |
n.a |
|
16 |
Posterolateral branch from RCA |
n.a |
|
16a |
Posterolateral branch from RCA |
n.a |
|
16b |
Posterolateral branch from RCA |
n.a |
|
16c |
Posterolateral branch from RCA |
n.a |
|
5 |
Left main |
6 |
|
6 |
LAD proximal |
3.5 |
|
7 |
LAD mid |
2.5 |
|
8 |
LAD apiucal |
1 |
|
9 |
First diagonal |
1 |
|
9a |
First diagonal |
1 |
|
10 |
Second diagonal |
0.5 |
|
10a |
Second diagonal |
0.5 |
|
11 |
Proximal circumflex |
2.5 |
|
12 |
Intermediate or anterolateral |
1 |
|
12a |
Obtuse marginal |
1 |
|
12b |
Obtuse marginal |
1 |
|
13 |
Distal circumflex |
1.5 |
|
14 |
Left posterolateral |
1 |
|
14a |
Left posterolateral |
1 |
|
14b |
Left posterolateral |
1 |
|
15 |
Posterior descending |
1. |
Specialty: Cardiology
ICD-10: ,
