Segmental model of LV

There is a 16 segment model and a 17 segment model

16 segment model:

There are 6 basal, 6 mid and 4 apical segments
The naming is from anteroseptal and continues anticlockwise

Basal
1- Anteroseptal
2- Anterior
3- Lateral
4- Posterior
5- Inferior
6- Septal

Mid
7- Anteroseptal
8- Anterior
9- Lateral
10- Posterior
11- Inferior
12- Septal

Apical
13- Anterior
14- Lateral
15- Inferior
16- Septal


In the transgastric view one can see all the segments at a particular level.
Visualising apical segment is difficult in TOE.

Segments seen in different views:
1- Long axis view are – (130)
Anteroseptal – 1, 7 – LAD territory
Posterior – 4, 10 – LCX territory

2- 2-C view are – (90)
Anterior – 2, 8 and 13 – LAD territory
Inferior – 5, 11 and 15 – RCA territory

3- 4- C View – (10)
Lateral – 3, 9 and 14 are seen – LCX territory.
Septal – 6, 12 and 16 are seen – LAD territory

Segmental Blood supply:
1- LAD territory includes –
Septal (6, 12, 16)
Anteroseptal (1, 7)
Anterior (2, 8, 13)

2- LCX territory –
Lateral (3, 9, 14)
Posterior (4, 10)

3- RCA territory –
Inferior (5, 11, 15).




17 segment model:

Basal
1- Anterior
2- Anteroseptal
3- Inferoseptal
4- Inferior
5- Inferolateral
6- Anterolateral

Mid
7- Anterior
8- Anteroseptal
9- Inferoseptal
10- Inferior
11- Inferolateral
12- Anterolateral

Apical
13- Anterior
14- Septal
15- Inferior
16- Lateral
17- Apical

There are segments at three levels. The naming progression is clockwise.