The Effect of the Cause of Delivery on Neonatal Outcomes in Early Preterm Deliveries (original) (raw)
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The cause of birth is associated with neonatal prognosis in late preterm singletons
Journal of Gynecology Obstetrics and Human Reproduction, 2020
Introduction: Recent studies have shown that the cause of very preterm births may be related to neonatal morbidity and mortality. Even though these risks are lower among late preterm births, this group accounts for the vast majority of all preterm births. The objective of this study was to evaluate the relation of neonatal morbidity and mortality to the cause of late preterm birth. Materials and methods: This retrospective observational cohort study included all women who gave birth to liveborn singletons from 34 to 36 weeks+6 days of gestation in a French level III maternity hospital in the 5-year period 2013-2017. The causes of preterm delivery were divided into 6 mutually exclusive groups. The main outcome was a composite neonatal morbidity criterion, defined by at least one among the following criteria: neonatal respiratory distress, neurological complications, neonatal sepsis, severe necrotizing enterocolitis, and neonatal hypoglycemia. We analyzed the association between cause of preterm delivery and neonatal morbidity after adjustment for gestational age and antenatal corticosteroid therapy. The reference group was preterm labor, defined by spontaneous preterm labor with intact membranes. Results: During the study period, there were a total of 27 110 births, including 1114 singleton births at 34 to 36 weeks of gestation + 6 days (4.1%). Among the 968 late preterm births included, the risk of neonatal morbidity in the group with preterm premature rupture of membranes (PPROM) was similar to that in the preterm labor (reference) group: adjusted odds ratio (aOR) 1.2 (95% CI, 0.8-1.8). All the other causes of late preterm birth were associated with a higher risk of neonatal morbidity than the reference group: aOR 2.0 [95% CI,1.1-3.5] for hypertensive disorders without suspected fetal growth restriction (FGR) (9.1% of cases), aOR 2.4 [95% CI, 1.4-4.2] for hypertensive disorders with suspected FGR (8.9%), aOR 4.2 [95% CI, 2.2-8.0] for suspected FGR without hypertensive disorders (5.8%), and aOR 4.4 [95% CI, 2.2-8.8] for vaginal bleeding related to abnormal placental insertion (4.7%). Conclusion: Among infants born from 34 to 36 weeks + 6 days of gestation, PPROM and preterm labor had similar risks of neonatal morbidity, while the other causes were associated with a risk of neonatal morbidity at least twice that with preterm labor.
Preterm Incidence with Analytical Assessment of Causes and Risk Factors of Mortality
Journal of Babol University of Medical Sciences, 2020
J Babol Univ Med Sci; 22; 2020; PP: 101-109 Received: Oct 15 2019, Revised: Jan 13 2020, Accepted: Feb 14 2020. ABSTRACT BACKGROUND AND OBJECTIVE: Prematurity is a serious health problem and an important risk factor in neonatal mortality. This study aimed to determine the incidence rate of preterm newborns in the neonatal care unit and to study their different causes and risk factors in relation to their outcomes. METHODS: We conducted a prospective cross-sectional study in Misan Hospital for Child and Maternity during the whole year of 2018. All preterm neonates with gestational age 26-37 weeks needed ventilation support and associated with risk factors were enrolled in this study. Different preterm variables were studied in relation to their outcome including gestational age, birth weight, length, head circumference, gender, type of pregnancy, mode of delivery, presence of congenital anomaly, ventilation support. While maternal variables include age, address, antenatal care, educa...
Archives of Gynecology and Obstetrics, 2009
Objectives To characterize neonatal morbidity and mortality rates in extreme preterm deliveries (between 23 and 27 weeks' gestation) with and without PPROM, and to evaluate the association between PPROM and chorioamnionitis. Methods A retrospective population-based study was conducted on preterm singleton pregnancies delivered between 23 and 27 weeks' gestation from 1988 to 2007. Immediate neonatal morbidity and mortality rates in pregnancies complicated by PPROM were compared to pregnancies with intact membranes. A multivariate analysis was conducted in order to determine the independent association between PPROM and chorioamnionitis. Results Out of 1,437 preterm deliveries, 236 (16.4%) were complicated with PPROM. There were more neonates with low 1 min (61.0 vs. 42.5%; P = 0.001) and low 5 min (30.1 vs. 23.8%; P = 0.042) Apgar scores (of less than 7) in pregnancies complicated by PPROM than in the comparison group. There were more cases of chorioamnionitis in the PPROM group born at 23-24 weeks' gestation (33.8 vs. 17.0%; P < 0.001), and in the PPROM group born at 25-27 weeks (42.0 vs. 15.5%; P < 0.001). In the group born at 23-24 weeks' gestation, there were more postpartum deaths (PPD) in the PPROM group (70.0 vs. 54.8%; P = 0.013); however, there was no signiWcant diVerence in PPD in the groups born at 25-27 weeks. In the group born at 23-24 weeks, as well as at 25-27 weeks, there were fewer antepartum deaths (APD) in the PPROM group as compared to the control group (16.3 vs. 32.6%; P = 0.002, and 5.3 vs. 36.3%; P < 0.001; respectively). After adjusting for gestational age and gender, using a multivariate analysis, the association between PPROM and chorioamnionitis remained signiWcant (OR = 3.32; 95% CI 2.43-4.51, P < 0.001).
Pediatric Pulmonology, 2020
Objective: Preterm prelabor rupture of membranes (PPROM) precedes 30%-40% of all preterm births. Early preterm delivery (<34 gestation weeks) is a well-established risk factor for short-and long-term respiratory morbidity in the offspring. We aimed to ascertain whether the presence of PPROM, before early preterm delivery, independently impacts long-term respiratory hospitalizations in the offspring. Study Design: A population-based retrospective cohort analysis was performed including all singleton early preterm deliveries. Exposure was defined as the presence of PPROM. Hospitalizations of the offspring up to the age of 18 years involving respiratory-related morbidity were evaluated. A Kaplan-Meier survival curve and multivariable Cox regression model were used to assess the association. Results: During the study period, 3309 early preterm deliveries met the inclusion criteria. In 22.4% of cases (n = 742), PPROM was documented. Rates of respiratoryrelated hospitalizations of the offspring up to the age of 18 years were significantly higher in the exposed group (12.5% vs 9.4% in the unexposed group, P = .023). The survival curve demonstrated significantly higher cumulative incidence of respiratory hospitalizations in the exposed group (logrank P = .018). In the Cox regression model controlled for gestational age, and other clinically relevant confounders-PPROM before early preterm deliveries was independently associated with an increased risk for long-term childhood respiratory-related hospitalizations in the offspring (adjusted hazard ratio 1.40, 95% confidence interval, 1.05-1.87, P = .021). Conclusion: Fetal exposure to PPROM before early preterm delivery was associated with an increased risk for long-term respiratory hospitalizations in the offspring.
Cause-Specific Mortality of Very Preterm Infants and Antenatal Events
The Journal of Pediatrics, 2013
Objective To assess the relationship between antenatal factors and cause-specific risk of death in a large area-based cohort of very preterm infants. Study design The ACTION (Accesso alle Cure e Terapie Intensive Ostetriche e Neonatali) study recruited during an 18-month period all infants 22-31 weeks' gestational age admitted to neonatal care in 6 Italian regions (n = 3040). We analyzed the data of 2974 babies without lethal or acutely life-threatening malformations. Cause-specific risks of death adjusted for competing causes were calculated, and region-stratified multiple Cox regression analyses were used to study the association between cause-specific mortality and infants' characteristics, pregnancy complications, antenatal steroids, and place of birth. Results Deaths attributable to respiratory problems and intraventricular hemorrhage prevailed in the first 2 weeks of life, and those attributable to infections and gastrointestinal diseases afterwards. Antepartum hemorrhage was associated with respiratory deaths (hazard ratio [HR] 1.6, 95% CI 1.1-2.4), and maternal infection with deaths attributable to asphyxia (HR 32.5, 95% CI 4.1-259.4) and to respiratory problems (HR 2.8, 95% CI 1.6-5.2). Preterm premature rupture of membranes increased the likelihood of deaths due to neonatal infection (HR 1.8, 95% CI 1.0-3.1), and preterm labor/contractions of those due to respiratory (HR 1.5, 95% CI 1.1-2.0) and gastrointestinal diseases (HR 5.8, 95% CI 2.1-16.3). In addition, a birth weight z-score <À1 was associated with increasing hazards of death resulting from asphyxia, late infections, respiratory, and gastrointestinal diseases. Conclusions Different complications of pregnancy lead to different cause-specific mortality patterns in very preterm infants.
Lower mortality but higher neonatal morbidity over a decade in very preterm infants
Paediatric and Perinatal Epidemiology, 2007
de Kleine MJK, den Ouden AL, Kollée LAA, Ilsen A, van Wassenaer AG, Brand R, Verloove-Vanhorick SP. Lower mortality but higher neonatal morbidity over a decade in very preterm infants. Paediatric and Perinatal Epidemiology 2007; 21: 15-25. Better perinatal care has led to better survival of very preterm children, but may or may not have increased the number of children with cerebral and pulmonary morbidity. We therefore investigated the relationship between changes in perinatal care during one decade, and short-term outcome in very preterm infants. Perinatal risk factors and their effects on 28-day and in-hospital mortality, and on intraventricular haemorrhage and bronchopulmonary dysplasia (BPD) in survivors, were compared in two surveys of very preterm singleton infants in the Netherlands.
Morbidity and mortality in preterm infants less than 29 weeks of gestational age
DOAJ (DOAJ: Directory of Open Access Journals), 2019
Background: Preterm birth is certainly a public health problem. Aside from being an important cause of mortality, prematurity increases the risk of serious lifetime disabilities. Objective: To assess the overall survival, causes of death and neonatal morbidities associated with prematurity of newborns less than 29 weeks of gestational age (GA). Methods: Retrospective study including all preterm infants less than 29 weeks of GA admitted to the level III NICU at Centro Hospital São João in Porto, Portugal, between January 1st 2005 and December 31st 2016. Newborns were grouped in three groups according to their GA: G23 +0-24 +6 , G25 +0-26 +6 , G27 +0-28 +6. Results: In this 12-year-period, 160 preterm neonates less than 29 weeks of GA admitted to this NICU met our inclusion criteria. Overall deaths were 60 (37.5%), variating between 25 (92.6%) in the G23 +0-24 +6 , 23 (46%) in the G25 +0-26 +6 and 12 (14.5%) in the G27 +0-28 +6. Early neonatal mortality was 20.6% and the leading causes of death were intraventricular hemorrhage (IVH) and sepsis. Among survivors, 41% had bronchopulmonary dysplasia (BPD), 69% developed late sepsis, 56% retinopathy of prematurity (ROP), 44% IVH and 10% cystic periventricular leukomalacia (cPVL). Conclusions: Mortality rates in this preterm group were high in spite of all the technological and scientific advances. Pulmonary conditions (respiratory distress syndrome and BPD), sepsis and neurologic outcomes (ROP, IVH and cPVL) were still major causes of morbidity. In line with other series, the limit of viability in this cohort of preterm infants is 25 weeks of GA. Prenatal, perinatal and postnatal care still all have a long road ahead, especially when it comes to these "gray zone" newborns.
The Australian and New Zealand Journal of Obstetrics and Gynaecology, 1997
A total of 189 infants of 24-29 weeks' gestation were born in a regional perinatal centre during a 2-year period. They were divided into groups according to the primary cause of preterm delivery: antepartum haemorrhage (n=37, 20%), preeclampsia (n=27, 14%), preterm premature rupture of membranes (n=64, 34%), preterm labour (n=27, 14%), chorioamnionitis (n=16, 8%), other complications (n=18, 10%). The perinatal mortality rate (PMR) was 286/1,000 of whom 44% were stillbirths. The 'other complication'group had the highest PMR due to a large number of intrauterine deaths, with no differences in neonatal mortality between the groups. Preeclampsia was associated with an increased risk of necrotizing enterocolitis and chorioamnionitis was associated with an increased risk of penventricular haemorrhage. Follow-up to at least 2 years was performed in 122 (97%) of survivors. Cerebral palsy occurred in 7%, while 18% had neurodevelopmental disability. No relationship was found between primary cause of preterm delivery and outcome. This information should be of value in counselling parents when preterm delivery is imminent.
A prospective analysis of etiology and outcome of preterm labor
2007
To identify etiological factors and to assess the neonatal mortality and morbidity associated with preterm labor and delivery. METHOD(S) : In this prospective cohort study conducted over a 8 months period (January to August 2005) 416 antenatal women admitted with threatened preterm labor and in preterm labor, with or without rupture of membranes, were recruited. They were followed up from admission till delivery and discharge. Gestational age at onset of preterm labor, associated risk factors, response to tocolytics if given, gestational age at delivery, and neonatal outcome were recorded and analyzed. RESULTS : Incidence of preterm labor was 22% and that of preterm deliveries 20.9% Preterm rupture of membranes and infection were the commonest causes of preterm labor. Irrespective of the use of a course of betamethasone, neonatal mortality was significantly high (P<0.0001) in babies delivering before 34 weeks (30.4%) as compared to that in babies delivering after 34 weeks (3.4%). Septicemia, respiratory distress syndrome (RDS) and birth asphyxia were the important causes of neonatal morbidity. RDS was significantly reduced in those who completed steroid cover (P=0.029). CONCLUSION(S) : There is a high incidence of preterm labor and preterm births in our set up, compared to developed countries. Infection is one important modifiable risk factor which can be curtailed. Prolongation of delivery for 48 hours by giving tocolysis for getting the benefit of betamethasone coverage reduces morbidity due to RDS but does not reduce overall neonatal mortality below 34 weeks.
Short-term Neonatal Outcome in Low-Risk, Spontaneous, Singleton, Late Preterm Deliveries
Obstetrics & Gynecology, 2009
To estimate the effect of gestational age on short-term neonatal morbidity in cases of spontaneous, low-risk singleton late preterm deliveries and to identify predictors of adverse neonatal outcome. METHODS: This was a retrospective study of all spontaneous, low-risk late preterm deliveries (34 0/7 to 36 6/7 weeks of gestation) during the years 1997 to 2006 (n.)874,2؍ Multiple gestations and pregnancies complicated by preterm premature rupture of membranes (PROM) or maternal or fetal complications were excluded. Short-term neonatal outcome was compared with a control group of full-term deliveries in a 3:1 ratio (n.)434,7؍ Logistic regression analysis was used to identify risk factors for neonatal morbidity among late preterm infants. RESULTS: Compared with full-term infants, spontaneous late preterm delivery was independently associated with an increased risk of neonatal morbidity, including respiratory distress syndrome (4.2% compared with 0.1%, P<.001), sepsis (0.4% compared with 0.04%, P<.001), intraventricular hemorrhage (0.2% compared with 0.02%, P<.001), hypoglycemia (6.8% compared with 0.4%, P<.001), and jaundice requiring phototherapy (18% compared with 2.5%, P<.001). Cesarean delivery (odds ratio [OR] 2.1, 95% confidence interval [CI] 1.6-2.6), male sex (OR 1.4, 95% CI 1.1-1.8), and multiparity (OR 2.2, 95% CI 1.7-2.8) were independent risk factors for neonatal respiratory morbidity in cases of late preterm deliveries. The relationship between gestational age and neonatal morbidity was of continuous nature with a nadir at about 39 weeks rather than a term-preterm threshold phenomenon and was unrelated to birth weight. CONCLUSION: Late prematurity is associated with significant neonatal morbidity in cases of spontaneous lowrisk singleton deliveries. This information is important for appropriate counseling and should stimulate efforts to decrease the rate of late preterm deliveries.