Abstract
To examine the effect of intertwin interval on umbilical cord pH and Apgar scores of the second twin after vaginal delivery. A retrospective study of twin deliveries at a university hospital in Spain between August 2012 and September 2017. Inclusion criteria were vaginal delivery of both twins at 32 gestational weeks or more. Exclusion criteria were monochorionic pregnancies and indication for cesarean delivery. The sample was dichotomized by intertwin interval (<10 and ≥10minutes). Neonatal outcomes including Apgar scores and umbilical cord pH were evaluated. Overall, 323 twin deliveries were included. Intertwin interval was less than 10minutes in 277 (85.6%) cases, and 10minutes or longer in 46 (14.2%). There were no differences in maternal or obstetric characteristics between the groups. Incidence of instrumental delivery (P<0.001) and internal podalic version (P<0.001) for the second twin was higher in the longer interval group. A longer interval was associated with higher frequencies of 1-minute Apgar score below 4 (P=0.009), 5-minute Apgar score below 7 (P<0.001), and umbilical cord pH below 7.15 (P<0.001). Second twins with an intertwin interval of 10minutes or longer are more likely to have poorer Apgar scores and arterial blood pH below 7.15.
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