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  • Title: Morbidity and mortality of very low birth weight multiples compared with singletons.
    Author: Porta R, Capdevila E, Botet F, Verd S, Ginovart G, Moliner E, Nicolàs M, Rios J, SEN1500 Network.
    Journal: J Matern Fetal Neonatal Med; 2019 Feb; 32(3):389-397. PubMed ID: 28936899.
    Abstract:
    BACKGROUND: Previous studies comparing the neonatal outcome of very low birth weight (VLBW) multiples and singletons have suggested a worse outcome for multiples at gestational ages on the limits of viability. OBJECTIVES: The objective of this study is to determine the neonatal mortality and morbidity of VLBW multiples compared to singletons. METHODS: This is a retrospective study including all infants registered in the Spanish network for infants under 1500 g (SEN1500), over a 12-year period (from 2002 to 2013). Mortality and major morbidities were compared between singletons and multiples. RESULTS: About 32,770 infants were included: 21,123 singletons (64.5%) and 11,647 multiples (35.5%), with a mean gestational age of 29.5 weeks (22-38), and mean birth weight of 1115 g (340-1500). When adjusted by other perinatal factors, multiple pregnancy has a significantly higher risk of mortality than singleton pregnancy (odds ratio (OR) 1.15; IC 95% 1.05-1.26, p = .002), but not a higher risk of major morbidity or composite adverse outcome. In the subgroup of infants born before 26 weeks, multiples showed a higher risk of mortality (63.9% versus 51%, OR 1.7; 95% CI 1.47-1.96) and a higher risk of composite adverse outcome (88.9% versus 81.5%, OR 1.82, 95% CI 1.28-2.24). CONCLUSIONS: In preterm infants born with less than 1500 g, multiple pregnancy is a prognostic factor that can slightly increase mortality. Extremely preterm infants born before 26 weeks have a greater risk of mortality and major morbidity if they come from a multiple pregnancy.
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