3.3 Association of urgent BAS with prenatal IVS, VSD and FO
Within this cohort, 28 fetuses (58.3%) had d-TGA with an IVS, and 20 (41.7%) had d-TGA with a VSD. Among the former group, 14 neonates (50%) underwent urgent BAS while 14 (50%) did not, whereas among the latter group, 4 (20%) underwent urgent BAS while 16 (80%) did not. There was a significant association between IVS and urgent BAS(p=.03) (Table 4). The median VSD diameter of the fetuses undergoing urgent BAS was 2.5 mm (IQR 0.25), as compared with 3.85 mm (IQR 1.23) in fetuses without urgent BAS (p=.05).
Overall, the median FO diameter was 6 mm (IQR 1.53). The median FO diameters were 6.4 mm (IQR 1.5) and 5.9 mm (IQR 1.4) in those with and without VSD, respectively (p=.08).
The median FO diameter was significantly decreased in fetuses who required urgent BAS, as compared with those without urgent BAS (5.1 mm vs 6.3 mm, p=.002).
Neonates undergoing urgent BAS differed significantly from those without urgent BAS with respect to APGAR 1 min, basal pH, basal O2 saturation, duration of PGE infusions, FO diameter, and the presence of restrictive appearance of FO and VSD (p<.05) (Table 5).