[Influence of twin pregnancy by assisted reproductive technology on neonatal outcomes]

To study the influence of twin pregnancy by assisted reproductive technology (ART) versus twin pregnancy by spontaneous conception (SC) on neonatal outcomes.

A retrospective analysis was performed for the clinical data of 3 356 live twins with a gestational age of ≥24 weeks who were born in Nanjing Maternal and Child Health Hospital from 2017 to 2019, with 2 006 twins (1 003 pairs) in the ART group and 1 350 (675 pairs) in the SC group. The two groups were compared in terms of the mother's general information and pregnancy comorbidities and the general information, diseases, and outcomes of neonates.

Compared with the SC group, the ART group had a significantly higher maternal age (P < 0.05) and significantly higher rates of primiparity, cesarean section, and cervical cerclage (P < 0.05). Compared with the SC group, the ART group had significantly higher incidence rates of maternal pregnancy comorbidities including hypertension, gestational diabetes, and postpartum hemorrhage (P < 0.05). Compared with the SC group, the ART group had a significantly lower mean gestational age of neonates (P < 0.05) and a significantly higher proportion of very-low-birth-weight infants (6.8% vs 5.8%, P < 0.05), while ART did not increase the risks of preterm birth and low Apgar score. There were no significant differences between the two groups in the mortality rate of neonates and the incidence rates of neonatal diseases including respiratory distress syndrome, stage II/III necrotizing enterocolitis, bronchopulmonary dysplasia, and grade III-IV intracranial hemorrhage (P > 0.05).

Compared with twin pregnancy by SC, twin pregnancy by ART does not increase the neonatal mortality rate and risk of adverse outcomes.