Table 1 Morphological characteristics of atrioventricular septal defects

Position (Situs)

Solitus

33

55

Inversus

6

10

Dextroisomerism

19

32

Levoisomerism

2

3

AV Connection

Concordant

27

45

SVDI

10

17

RVDI

9

15

LVDI

8

14

Ambiguous

5

8

V-A Connection

RVDO

21

35

Concordant

19

32

SVDO

11

18

Discordant

9

15

Associated anomalies

Pulmonary stenosis

19

32

Pulmonary atresia

10

17

Patent foramen ovale

9

15

Patent ductus arteriosus

5

8

Anomalous connection of pulmonary veins

5

8

AV Valve dysplasia

1

1.6

Obstruction of the LV outflow tract

1

1.6