Table 1.

Coronary artery segments

Segment	Name	Description
1	Proximal right	From ostium to ½ distance to the acute margin. Gives rise to the conus branch and sinus node branch
2	Mid right	Up to the acute margin
3	Distal right	Up to the RPD origin
4	Right posterior descending	May be absent if left dominant
5	Left main	Ostium to bifurcation
6	Proximal left anterior descending	Up to origin of first septal perforator
7	Mid left anterior descending	Up to half the distance from the first septal perforator to the cardiac apex
8	Distal left anterior descending
9	First diagonal	May include ramus intermedius
10	Second diagonal
11	Proximal circumflex	Up to and including marginal branch origin
12	Obtuse marginal	Largest branch
13	Distal circumflex	Distal to marginal origin
14	Posterolateral	May be small
15	Left posterior descending	Present in left dominant system

RPD=Removable partial denture