[Influence of Fetomaternal Risk Factors on Mortality and Morbidity in Extremely Preterm Infants].

Introduction: The management of pregnant women at risk of preterm delivery poses a challenge to the interdisciplinary team. At the edge of viability, it is crucial to take into consideration maternal and fetal risk factors when determining individual counseling and therapeutic approaches.

Methods: At a level 4 perinatal center, all preterm infants (PI) born in the years 2017 to 2020 who had a gestational age between 23^0/7 and 24^6/7 weeks and were cared for with a curative therapeutic approach were enrolled in a retrospective observational study. Divided into two groups (23^0/7-23^6/7 and 24^0/7-24^6/7 weeks of gestation), the PI were compared in terms of mortality and morbidity based on maternal and fetal risk factors. Thirteen risk factors and their prognostic relevance for survival were analyzed.

Results: 41 mothers with 48 PI were included. 9 neonates received primary palliative treatment and were excluded from the analyses. The survival rates between the two groups (n=21, n=27) showed no significant difference (66.7% versus 74.1%, p=0.750). A significantly higher mortality was observed in PI with an increased number of risk factors (p=0.004), the most severe of which were hypertensive disorders of pregnancy and preterm premature rupture of membranes. Data regarding morbidity showed no significant difference.

Conclusion: Data regarding mortality correlate with national findings. Observed morbidity in the study population was recorded. The prediction of probability of survival is more precise when risk factors are taken into consideration.