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Original Article

Characterization of mothers at risk of delivery at the limit of viability and factors related to infant survival

, &
Pages 2198-2203 | Received 07 Mar 2016, Accepted 27 Sep 2016, Published online: 25 Oct 2016
 

Abstract

Objectives: To determine the sociodemographic and clinical characteristics of mothers of infants at the limit of viability and to know the perinatal factors associated to infants’ survival.

Method: Single-center cohort study of mothers and newborns assisted in our tertiary care center (2004–2010). Demographic and perinatal variables were compared between mothers who gave birth  ≤26 weeks GA and the general population. The association between perinatal factors and neonatal survival was studied by Cox regression analysis.

Results: Mothers of newborns  ≤26 weeks (n = 136) had less education and pregnancy control. They had more frequently assisted reproductive technologies (ART) (5.2% versus 2.3%; p< 0.05), multiple gestations (16.6% versus 2.1%; p < 0.05), pregnancy complications and C-section (39.7% versus 13.4%; p  < 0.001). After correcting for confounders, the perinatal factors independently associated with a variation in the risk of mortality were the administration of antenatal steroid [aHR (95%CI): 0.465 (0.254–0.853), p = 0.013], singleton pregnancy [aHR (95%CI): 0.482 (0.279–0.834), p = 0.009], infant’s temperature on admission [aHR (95%CI): 0.642 (0.426–0.968), p = 0.035] and CRIB score [aHR (95%CI): 1.151 (1.058–1.251), p  = 0.001].

Conclusions: Mothers of preterm infants at the limit of viability had more ART, multiple pregnancies, obstetrical complications and C-section. Infants’ survival was independently associated to antenatal steroids, singleton pregnancy, temperature on admission and CRIB score.

Declaration of interest

The authors report no conflict of interest. The authors alone are responsible for the content and writing of the manuscript.

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