Demographic and obstetric data of the study population is mentioned in Table 2
There was no significant difference in these two groups with respect to maternal age, type of conception and parity. There was high rate of preeclampsia in retrograde group (46%) as compared to antegrade group (24%). Gestational age at delivery (p=0.021) and birth weights (p=0.022) were significantly lower in the retrograde flow in the aortic isthmus group.
Distribution of complications in antegrade and retrograde flow in the aortic isthmus groups is given in Table 3 and figure 2.
Overall adverse perinatal outcome includes intrauterine death and postnatal complications. Retrograde AOI group had higher rates of adverse perinatal outcome (92.3% vs. 72%).Only 1/13 of retrograde group did not have any adverse perinatal outcome. There was 1 intrauterine death and 2 neonatal deaths in the study population .All these cases were from retrograde AOI group. Perinatal mortality was 3/13(23%) in retrograde flow in AoI group while there was no perinatal mortality in antegrade flow in AoI group.
Necrotizing enterocolitis was seen in one case from retrograde group. Respiratory distress syndrome was more common in retrograde AOI group (70% vs. 20%) (p =0.033). For remaining complications there was no such difference in these two groups. Distribution of complications in antegrade and retrograde flow in the aortic isthmus groups is shown in the figure.4 below.