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Perinatal mortality and morbidity. Comparison between maternal transport, neonatal transport and inpatient antenatal treatment.

The purpose was to assess differences in neonatal morbidity and mortality between maternally transferred, neonatally transferred and inborn neonates. We evaluated a continuous series of all antenatal transported infants (ATI, n=247) and postnatal transported infants (PTI, n=34) to the NICU and all preterm inborns (NTI, n=120) delivered at the University Hospital of Vienna. Data collected included sociodemographic, obstetrical and neonatal data. Mild neonatal morbidity was defined as RDS, BPD, ROP, PDA, NEC or IVH I-II, whereas severe neonatal morbidity was defined as the presence of PVL or IVH III-IV. Data were analyzed statistically using the Spearman correlation Coefficient, the Kruskal-Wallis test, and a multivariate model. There was a substantial gain in gestational age from transfer to delivery in the ATI group and from admission to delivery in the NTI group (2.1 and 5.6 weeks, respectively). The neonatal survival rate was 88.7% in the ATI and 97.5% in the NTI group. No neonate died in the PTI group; there was a significantly higher percentage of severe neonatal morbidity than in the ATI group (11.8% vs. 4.9%). We could not observe a significant difference with respect to the risk of death among the three study groups. There was a strong trend towards higher probability of severe neonatal morbidity in the NTI group. The risk of severe neonatal morbidity is much higher in the PTI-group (rel. risk 0.19, 0.06). Antenatal transfer guaranteed a significantly better neonatal outcome concerning severe neonatal morbidity than postnatal transport, and compared favorably with inborn admissions, even given the higher gestational age and birth weight in the NTI-group.