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Outcomes among Neonates after a Diagnosis of Persistent or Transient Fetal Growth Restriction Delivered at Term

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Abstract Objective  This study aimed to evaluate whether transient fetal growth restriction (FGR) that resolves prior to delivery confers a similar risk of neonatal morbidity as uncomplicated FGR that persists… Click to show full abstract

Abstract Objective  This study aimed to evaluate whether transient fetal growth restriction (FGR) that resolves prior to delivery confers a similar risk of neonatal morbidity as uncomplicated FGR that persists at term. Study Design  This is a secondary analysis of a medical record abstraction study of singleton live-born pregnancies delivered at a tertiary care center between 2002 and 2013. Patients with fetuses that had either persistent or transient FGR and delivered at 38 weeks or later were included. Patients with abnormal umbilical artery Doppler studies were excluded. Persistent FGR was defined as estimated fetal weight (EFW) <10th percentile by gestational age from diagnosis through delivery. Transient FGR was defined as EFW <10th percentile on at least one ultrasound, but not on the last ultrasound prior to delivery. The primary outcome was a composite of neonatal morbidity: neonatal intensive care unit admission, Apgar's score <7 at 5 minutes, neonatal resuscitation, arterial cord pH <7.1, respiratory distress syndrome, transient tachypnea of the newborn, hypoglycemia, sepsis, or death. Baseline characteristics and obstetric and neonatal outcomes were compared using Wilcoxon's rank-sum and Fisher's exact test. Log binomial regression was used to adjust for confounders. Results  Of 777 patients studied, 686 (88%) had persistent FGR and 91 (12%) had transient FGR. Patients with transient FGR were more likely to have a higher body mass index, gestational diabetes, diagnosed with FGR earlier in pregnancy, have spontaneous labor, and deliver at later gestational ages. There was no difference in the composite neonatal outcome (relative risk = 1.03, 95% confidence interval [CI] 0.72, 1.47) for transient versus persistent FGR after adjusting for confounders (adjusted relative risk = 0.79, 95% CI 0.54, 1.17). There were no differences in cesarean delivery or delivery complications between groups. Conclusion  Neonates born at term after transient FGR do not appear to have differences in composite morbidity compared with those where uncomplicated FGR persists at term. Key Points No differences in neonatal outcomes in uncomplicated persistent versus transient FGR at term. Transient FGR pregnancies more likely to deliver at later gestational ages. No differences in mode of delivery or obstetric complications in persistent versus transient FGR at term.

Keywords: transient fgr; fgr; term; transient; delivery; transient fetal

Journal Title: American Journal of Perinatology
Year Published: 2022

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