Table 1.
Cardiovascular abnormalities after ligation. The number and percentage of malformations are indicated for each stage. Different malformations were sometimes observed in the same embryo, therefore, the sum of a column can exceed 100%.
| Hamburger Hamilton (HH) Stages | 8–20 | 22–23 | 24 | Total 18–24 | ||||
|---|---|---|---|---|---|---|---|---|
| Number of Embryos | n = 19 | % | n = 16 | % | n = 28 | % | n = 61 | % |
| Normal | 0 | 0 | 0 | 0 | 77 | 25 | 7 | 11 |
| Disturbed looping | 6 | 32 | 5 | 31 | 9 | 32 | 20 | 32 |
| Hypoplastic atrioventricular (AV) cushions | 7 | 37 | 8 | 50 | 9 | 32 | 24 | 38 |
| Hypoplastic outflow tract (OFT) cushions | 3 | 16 | 2 | 13 | 6 | 21 | 11 | 17 |
| Myocardium left atrium | 8 | 42 | 4 | 25 | 0 | 0 | 16 | 25 |
| Myocardium ventricle | 3 | 16 | 3 | 19 | 6 | 21 | 12 | 19 |
| Pharyngeal arch arteries | 1 | 5 | 1 | 6 | 7 | 25 | 9 | 14 |