Neonatal Outcomes Differ after Spontaneous and Indicated Preterm Birth

The Impact of Spontaneous versus Indicated Preterm Birth on Neonatal Outcomes among Extremely Premature Neonates

OBJECTIVE

 This study aimed to investigate whether neonatal morbidity differs in spontaneous compared with indicated preterm births in extremely premature neonates.

STUDY DESIGN

 This is a retrospective cohort study including births ≤28 weeks at a single institution from 2011 to 2020. Births were categorized as either medically indicated or spontaneous preterm deliveries. The primary outcome was inhospital mortality and serious morbidity in survivors. t-tests, Fisher's exact tests, chi-square tests, and logistic regression models were utilized as appropriate. p < 0.05 was significant.

RESULTS

 Two hundred and twenty-seven births were included, with two-thirds representing spontaneous births (65.6%, 149/227) and one-third categorized as medically indicated births (34.4%, 78/227). Inhospital mortality was more common in the spontaneous preterm birth group (p = 0.04), while inhospital morbidity did not significantly vary between the medically indicated and spontaneous birth groups (p = 0.32). There was no difference in inhospital morbidity or mortality by maternal race. In multivariate models of inhospital morbidity and mortality, gestational age was the only significant predictor of adverse outcomes.

CONCLUSION

 Despite inhospital mortality being more common in spontaneous preterm births, inhospital mortality and significant morbidity are best accounted for by gestational age alone.

KEY POINTS

· Inhospital death is more common in spontaneous preterm births.. · Perinatal outcomes do not differ on the basis of racial/ethnic group.. · Gestational age is the best predictor of inhospital morbidity and mortality..

How Did the COVID-19 Pandemic Affect Maternal and Neonatal Health?

OBJECTIVE

 The aim of this study was to investigate the effects of the coronavirus disease 2019 (COVID-19) pandemic on the proportional growth of the fetus, maternal health, and neonatal outcomes.

STUDY DESIGN

 The study group (Group 1) included pregnant women with a history of COVID-19. Pregnant women who were hospitalized during the same period without COVID-19 were the control group (Group 2). Maternal and neonatal outcomes were compared between the groups.

RESULTS

 A total of 230 pregnant women and their infants were assessed. Group 1 (n = 74) had significantly higher rates of diabetes mellitus and hypertension than Group 2 (n = 156; p = 0.015 and 0.014, respectively). Premature birth and cesarean section rates were also significantly higher in Group 1 than in Group 2 (p = 0.001 and 0.040, respectively). While the rate of iatrogenic preterm birth was significantly higher in Group 1, the rate of spontaneous preterm birth was significantly higher in Group 2 (p = 0.049). Infants born to COVID-19-positive mothers had lower median gestational age, birth weight, and Apgar scores (p < 0.01). There was no significant difference between the groups in terms of the results of cord blood gas analysis (p > 0.05). The rate of admission to the neonatal intensive care unit (NICU) and need for mechanical ventilation was significantly higher in infants of COVID-19-positive mothers (p < 0.05 for both). The length of stay in the NICU was also significantly longer for the infants of COVID-19-positive mothers (p < 0.05). Birth weights decreased due to increased cases of iatrogenic preterm births (p < 0.05). However, ponderal indices (PIs) of newborns of pregnant COVID-19 mothers did not differ at birth (p > 0.05).

CONCLUSION

 COVID-19 is associated with low Apgar scores, increased risk of premature birth complications, and maternal comorbidities, with no effect on the PI and proportionate growth of the infant at birth.

KEY POINTS

· No difference in ponderal indices.. · No difference in postnatal cardiovascular adaptation.. · COVID-19 is frequent in pregnant women with comorbidities like diabetes mellitus and hypertension..

Prescription Opioid Exposure During Pregnancy and Risk of Spontaneous Preterm Delivery

Importance

Opioid exposure during pregnancy has been associated with preterm birth, but prior studies have not differentiated between spontaneous and indicated preterm birth or fully investigated these associations as functions of opioid dose.

Objective

To determine whether prescription opioid use during pregnancy is associated with spontaneous preterm birth and whether the association is dose-dependent.

Design, Setting, and Participants

This case-control study examined a retrospective cohort of pregnant patients enrolled in Tennessee Medicaid. Enrollment files were linked to health care encounters, hospital discharge information, birth certificate data, and prescription fills. Eligible participants were pregnant people ages 15 to 44 years without opioid use disorder who experienced birth of a single fetus at 24 weeks gestation or greater between 2007 and 2019 with linked birth certificate data. Cases of spontaneous preterm birth were matched with up to 10 controls based on pregnancy start date, race, ethnicity, age at delivery within 2 years, and history of prior preterm birth. Cases and matched controls were continuously enrolled in TennCare for at least 90 days prior to the index date (case delivery date).

Exposure

Total opioid MME filled during the 60 days prior to the index date.

Main Outcomes and Measures

The primary outcome was spontaneous preterm birth determined by a validated algorithm using birth certificate data. Conditional logistic regression was used to estimate the association between spontaneous preterm birth and total opioid morphine milligram equivalents (MME) dispensed, adjusting for parity, prepregnancy body mass index, education level, tobacco use, hepatitis infections, and pain indications.

Results

A total of 25 391 cases (median [IQR] age, 23 [20-28] years; 127 Asian [0.5%], 9820 Black [38.7%], 664 Hispanic [2.6%]; 14 748 non-Hispanic White [58.1%]) with spontaneous preterm birth were identified and matched with 225 696 controls (median [IQR] age, 23 [20-27] years; 229 Asian [0.1%], 89 819 Black [39.8%], 3590 Hispanic [1.6%]; 132 002 non-Hispanic White [58.5%]) (251 087 patients total), with 18 702 patients (7.4%) filling an opioid prescription in the 60 days prior to the index date. Each doubling of nonzero opioid MME was associated with a 4% increase in the odds of spontaneous preterm birth compared with no opioid exposure (adjusted odds ratio, 1.04; 95% CI, 1.01-1.08).

Conclusions and Relevance

In this case-control study, a positive association was found between total prescription opioid dose dispensed and the odds of spontaneous preterm birth. These findings support guidance to minimize opioid exposure during pregnancy and prescribe the lowest dose necessary.

Association of delivery risk phenotype with early-onset sepsis in preterm infants

OBJECTIVE

To determine delivery risk phenotype-specific incidence of early-onset sepsis (EOS) among preterm infants.

STUDY DESIGN

Retrospective cohort study of infants born <35 weeks' gestation at four perinatal centers during 2017-2021. Infants were classified into one of six delivery risk phenotypes incorporating delivery mode, presence of labor, and duration of rupture of membranes (ROM). The primary outcome was EOS incidence within the overall cohort and each risk phenotype.

RESULTS

Among 2937 preterm infants, 21 had EOS (0.7%, or 7.1 cases/1000 preterm infants). The majority of EOS cases (13/21, 62%) occurred in the setting of prolonged ROM ≥ 18 h, with a phenotype incidence of 23.8 cases/1000 preterm infants. There were no EOS cases among infants born by cesarean section without ROM (with or without labor), nor via cesarean section with ROM < 18 h without labor.

CONCLUSION

Delivery risk phenotyping may inform EOS risk stratification in preterm infants.

Iatrogenic vs. Spontaneous Preterm Birth: A Retrospective Study of Neonatal Outcome Among Very Preterm Infants

Objective: Preterm birth is a leading contributor to childhood morbidity and mortality, and the incidence tends to increase and is higher in developing countries. The aim of this study was to analyze the potential impact of preterm birth in different etiology groups on neonatal complications and outcomes and to gain insight into preventive strategies.

Methods: We performed a retrospective cohort study of preterm infants less than 32 weeks' gestation in the Third Affiliated Hospital of Zhengzhou University from 2014 to 2019. Preterm births were categorized as spontaneous or iatrogenic, and these groups were compared for maternal and neonatal characteristics, neonatal complications, and outcomes. All infants surviving at discharge were followed up at 12 months of corrected age to compare the neurodevelopmental outcomes.

Results: A total of 1,415 mothers and 1,689 neonates were included, and the preterm population consisted of 1,038 spontaneous preterm infants and 651 iatrogenic preterm infants. There was a significant difference in the incidence of small for gestational age between the two groups. Infants born following spontaneous labor presented with a higher risk of intraventricular hemorrhage, whereas iatrogenic preterm birth was associated with higher risk of necrotizing enterocolitis and coagulopathy and higher risk of pathoglycemia. There was no difference in mortality between the two groups. Follow-up data were available for 1,114 infants, and no differences in neurologic outcomes were observed between the two preterm birth subtypes.

Conclusions: Preterm births with different etiologies were associated with some neonatal complications, but not with neurodevelopmental outcomes at 12 months of corrected age.

Accelerated fetal growth in early pregnancy and risk of preterm birth: a prospective cohort study

BACKGROUND

Preterm birth (occurring before 37 completed weeks of gestation) affects 15 million infants annually, 7.5% of which die due to related complications. The detection and early diagnosis are therefore paramount in order to prevent the development of prematurity and its consequences. So far, focus has been laid on the association between reduced intrauterine fetal growth during late gestation and prematurity. The aim of the current study was to investigate the association between accelerated fetal growth in early pregnancy and the risk of preterm birth.

METHODS

This prospective cohort study included 69,617 singleton pregnancies without congenital malformations and with available biometric measurements during the first and second trimester. Estimation of fetal growth was based on measurements of biparietal diameter (BPD) at first and second trimester scan. We investigated the association between accelerated fetal growth and preterm birth prior to 37 weeks of gestation. The outcome was further stratified into very preterm birth (before 32 weeks of gestation) or moderate preterm birth (between 32 and 37 weeks of gestation) and medically induced or spontaneous preterm birth and was further explored.

RESULTS

The odds of prematurity were increased among fetuses with accelerated BPD growth (> 90th centile) estimated between first and second ultrasound scan, even after adjustment for possible confounders (aOR 1.36; 95% CI 1.20-1.54). The findings remained significant what regards moderate preterm births but not very preterm births. Regarding medically induced preterm birth, the odds were found to be elevated in the group of fetuses with accelerated growth in early pregnancy (aOR 1.34; 95% CI 1.11-1.63). On the contrary, fetuses with delayed fetal growth exhibited lower odds for both overall and spontaneous preterm birth.

CONCLUSIONS

Fetuses with accelerated BPD growth in early pregnancy, detected by ultrasound examination during the second trimester, exhibited increased odds of being born preterm. The findings of the current study suggest that fetal growth in early pregnancy should be taken into account when assessing the risk for preterm birth.

Neurodevelopment at 2 years and umbilical artery Doppler in cases of very preterm birth after prenatal hypertensive disorder or suspected fetal growth restriction: EPIPAGE-2 prospective population-based cohort study

OBJECTIVE

To investigate the association between absent or reversed end-diastolic flow (ARED) on umbilical artery Doppler ultrasound and poor neurological outcome at 2 years of age after very preterm birth associated with suspected fetal growth restriction (FGR) or maternal hypertensive disorders.

METHODS

The study population comprised all very preterm (22-31 completed weeks) singleton pregnancies delivered because of suspected FGR and/or maternal hypertensive disorders that had umbilical artery Doppler and 2-year follow-up available included in EPIPAGE-2, a prospective, nationwide, population-based cohort of preterm births in France in 2011. Univariate and two-level multivariable logistic regression analyses were used to assess the association of ARED in the umbilical artery, as compared with normal or reduced end-diastolic flow, with severe or moderate neuromotor and/or sensory disability and with an Ages and Stages Questionnaire (ASQ) score below a threshold. This was defined as a score more than 2 SD below the mean in any of the five domains, at age 2, adjusting for gestational age at delivery. ASQ is used to identify children at risk of developmental delay requiring reinforced follow-up and further evaluation. Descriptive statistics and bivariate tests were weighted according to the duration of the inclusion periods.

RESULTS

The analysis included 484 children followed up at 2 years of age, for whom prenatal umbilical artery Doppler ultrasound was available. Among them, 8/484 (1.6%) had severe or moderate neuromotor and/or sensory disability, and 156/342 (45.4%) had an ASQ score below the threshold. Compared with normal or reduced end-diastolic flow in the umbilical artery (n = 305), ARED (n = 179) was associated with severe or moderate neuromotor and/or sensory disability (adjusted odds ratio (OR), 11.3; 95% CI, 1.4-93.2) but not with an ASQ score below the threshold (adjusted OR, 1.2; 95% CI, 0.8-1.9).

CONCLUSION

Among children delivered before 32 weeks of gestation due to suspected FGR and/or maternal hypertensive disorder who survived until 2 years of age, prenatal ARED in the umbilical artery was associated with a higher incidence of severe or moderate neuromotor and/or sensory disability. Copyright © 2020 ISUOG. Published by John Wiley & Sons Ltd.