Neonatal Outcomes In Twin Pregnancies Research Articles

A comprehensive analysis of twin births: clinical characteristics, morbidity trends, and risk determinants

Background: Twin births are often associated with increased risks and complications compared to singleton births. This study aims to analyze the clinical profile, morbidity pattern, and risk factors associated with twin births, focusing on maternal characteristics, neonatal outcomes, and the prevalence of conditions such as low birth weight (LBW) and preterm births. Methods: This hospital-based observational study was conducted at a tertiary care center, involving 25 mothers who had given birth to twins and their 50 neonates. The study assessed maternal age, antenatal care, parity, medical history, and neonatal outcomes including birth weight, gestational age, respiratory and cardiac parameters, and overall health status. Data were collected through medical records and direct observations in the neonatal intensive care unit. Results: The majority of mothers (64%) were aged between 21-30 years, with a mean age of 24.8 years. A significant proportion (92%) had regular antenatal visits, and 96% were multiparous. The majority of neonates (68%) were aged ≤12 hours at assessment, with a near-equal distribution between very low birth weight (VLBW) and LBW. Preterm births were common, affecting 84% of the neonates. Respiratory challenges were evident, with 62% of neonates having SpO2 levels below 94%. The mortality rate among the neonates was 32%. Conclusions: The study highlights the high-risk nature of twin pregnancies, characterized by a significant prevalence of LBW, VLBW, and preterm births. The findings emphasize the need for enhanced prenatal care and specialized neonatal interventions. The high mortality rate among neonates indicates the critical need for targeted strategies to improve neonatal outcomes in twin pregnancies. These insights are crucial for informing clinical practices and developing comprehensive care protocols for managing twin pregnancies and their associated risks.

Retracted Article: The effect of maternal gestational diabetes on maternal and neonatal outcomes in twin pregnancies: A systematic review and meta-analysis

Retracted Article: The effect of maternal gestational diabetes on maternal and neonatal outcomes in twin pregnancies: A systematic review and meta-analysis

Analysis of the Effects of Maternal Body Mass Index and Gestational Weight Gain on Maternal and Neonatal Outcomes in Twin Pregnancy

Objective: To investigate the effects of maternal body mass index (BMI) and gestational weight gain on maternal and neonatal outcomes in twin pregnancies. Methods: Five hundred cases of twin pregnancies were divided into a low body weight group (68 cases), a normal weight group (355 cases), an overweight group (65 cases), and an obesity group (12 cases) according to the World Health Organization (WHO) Body Mass Index (BMI) classification guidelines Results: Comparison of weight gain during different pregnancies revealed that pregnant women were mainly of low weight and average weight. The higher the BMI before pregnancy, the higher the incidence of excessive weight gain during pregnancy. The incidences of gestational diabetes mellitus (GDM) and premature rupture of membranes in women with low weight gain were significantly higher than those in women with average weight gain and high weight gain (P < 0.05). The incidences of gestational hypertension, preeclampsia, and anemia in women with high weight gain were significantly higher than those in women with low weight gain and average weight gain (P < 0.05). The incidence of neonatal birth weight, fetal distress, and macrosomia in the high weight gain group was significantly higher than those in the low weight gain and average weight gain groups (P < 0.05). The birth weight of newborns in low-weight gain mothers was significantly lower than that of normal-weight gain mothers (P < 0.05). Conclusion: Poor maternal and infant outcomes were common in women with insufficient or excessive weight gain during pregnancy. Therefore, for women with twin pregnancies, weight management is crucial to ensure maternal and infant health.

The sFlt-1/PlGF Ratio at 12, 24, and 32 Weeks Gestation in Twin Pregnancies as a Predictor of Placental Dysfunction.

Background: This study aims to assess the utility of the sFlt-1/PlGF ratio throughout pregnancy in predicting placental dysfunction and neonatal outcomes in twin pregnancies. Methods: Prospective study at a tertiary hospital. All pregnant women with a twin pregnancy who signed the informed consent were included. The sFlt-1/PlGF ratio was measured at 12, 24, and 32 weeks' gestation. Results: Seventy patients were included, and 30% developed placental dysfunction. Differences were found in the mean sFlt-1/PlGF ratios at week 32 (13.6 vs. 31.8, p = 0.007). Optimal cutoffs at 12, 24, and 32 weeks to identify patients who develop placental dysfunction were 32.5, 8.5, and 30.5, respectively, with ORs of 4.25 (1.13-20.69 95% IC; p = 0.044), 13.5 (3.07-67.90 95% IC; p = 0.001), 14.29 (3.59-66.84 95% IC; p < 0.001). The sFlt-1/PlGF ratio at 32 weeks was associated with gestational age at birth. The sFlt-1/PlGF ratio in weeks 24 and 32 had a statistically significant negative correlation with the birth weight percentile in both twins. Conclusions: The potential of the sFlt-1/PlGF ratio as a predictive tool for placental dysfunction in twin pregnancies is underscored.

Maternal and neonatal outcomes of twin pregnancies complicated by gestational diabetes mellitus

IntroductionGestational diabetes mellitus (GDM) is associated with a higher risk of adverse maternal outcomes, but its effects on maternal and perinatal outcomes of twin pregnancies remain conflicting.MethodsThis retrospective cohort study included all primipara who delivered twin pregnancies at a single tertiary perinatal center between January 1, 2016 and December 31, 2022. Excluded were those who had a single pregnancy, twin pregnancies with pre-existing diabetes, missing information on GDM screening, a delivery before gestational 28 weeks, complications related to monochorionic placentation, multifetal reduction, fetal anomalies, and monochorionic monoamniotic twins. Maternal outcomes included preterm birth, pre-eclampsia, hypothyroidism, preterm premature rupture of membranes (PROM), placental abruption, severe postpartum hemorrhage, and oligohydramnios. Neonatal outcomes included small-for-gestational-age (SGA), large-for-gestational-age (LGA), birthweight, Apgar score, neonatal intensive care unit (NICU) admission, extrauterine growth restriction (EUGR), and neonatal hypoglycemia.ResultsA total of 3269 twins were delivered, with 897 women (27.4%) diagnosed with GDM during pregnancies; moreover, 72 (8.0%) of these women received insulin treatment. The GDM group showed a significantly higher maternal age at delivery (≥35 years), as well as incidences of overweight and obesity. These factors also elevated the odds of insulin treatment in GDM women with twin pregnancies (OR = 1.881, 95% CI = 1.073–3.295, P = 0.027; OR = 2.450, 95% CI = 1.422–4.223, P < 0.001; OR = 4.056, 95% CI = 1.728–9.522, P < 0.001, respectively). Chronic hypertension prior to pregnancy was identified as a risk factor for GDM during twin pregnancies (OR = 1.896, 95% CI = 1.290–2.785, P < 0.001), although it did not increase the proportion of women requiring insulin treatment (P = 0.808). Aside from a higher incidence of preterm birth before 37 weeks in insulin-treated GDM twins (OR = 2.096, 95% CI = 1.017–4.321, P = 0.045), there were no significant difference in other maternal outcomes (preterm birth before 34 weeks, pre-eclampsia, hypothyroidism, PROM, placental abruption, placenta previa, severe postpartum hemorrhage, and oligohydramnios) between the GDM group and non-GDM group, and between insulin-treated GDM and non-insulin-treated GDM. The rate of newborns with birthweight <1500 g was significantly lower among twins born to GDM women, but the prevalence of EUGR was notably higher. Additionally, the risk of EUGR was elevated in insulin-treated GDM twins (OR = 3.170, 95% CI = 1.639,6.131, P < 0.001). No significant differences were observed between the GDM group and non-GDM group, or between insulin-treated GDM and non-insulin-treated GDM group in terms of mean birthweight, newborn sex ratio, and incidences of other adverse neonatal outcomes, including gestational age at delivery, LGA, birth weight <2500 g, and 1-min and 5-min Apgar scores.ConclusionMaternal age ≥35 years, overweight or obesity, and chronic hypertension are significant risk factors for GDM during twin pregnancies. Women with GDM during twin pregnancies may achieve similar outcomes compared to those without GDM. However, the women with GDM during twin pregnancies receiving insulin therapy may have a higher risk of preterm birth and EUGR.

Effect of delayed cord clamping on maternal and neonatal outcome in twin pregnancies: a retrospective cohort study

The objective of this study was to compare the maternal and neonatal outcomes following delayed cord clamping (DCC) versus immediate cord clamping (ICC) in twin pregnancies. This was a retrospective cohort study of 705 twin pregnancies who delivered at ≥ 24 weeks of gestation. Maternal and neonatal hemoglobin levels, blood transfusion, and neonatal outcomes were compared between DCC (n = 225) and ICC (n = 480) groups. Mean maternal predelivery and postpartum hemoglobin levels and the rate of postpartum hemoglobin drop ≥ 20% or maternal blood transfusion were comparable between the two groups. The DCC group had a significantly higher mean neonatal hemoglobin level (DCC vs. ICC: 17.4 ± 3.5 vs. 16.6 ± 2.7 g/dl, P = 0.010) but significantly lower rates of neonatal blood transfusion (DCC vs. ICC: 3.3% vs. 8.8%, P < 0.001) and respiratory distress syndrome (DCC vs. ICC: 6.7% vs. 15.2%, P < 0.001) than the ICC group. In conclusion, DCC compared with ICC in twin pregnancy was not associated with an increase of maternal postpartum bleeding complications, but it was associated with higher neonatal hemoglobin level and lower risks of neonatal blood transfusion and respiratory distress syndrome.

Outcomes of vertex-vertex vs. vertex-breech presentation in twin pregnancy after vaginal delivery in China.

To compare the maternal and neonatal outcomes of twin pregnancies between vertex and nonvertex presentations of the second twin in vaginal delivery. In this unicentric retrospective cohort study, we collected data from 213 cases of vaginal twin deliveries from January 2016 to July 2020. Participants were divided into the vertex-vertex presentation group (VV) and vertex-breech presentation group (VB). Data on maternal and neonatal outcomes were compared between groups. Among the 213 mothers and 426 infants (213 twin pairs), there were 140 women in the VV group and 73 women in the VB group (65.73% vs. 34.27%). Infants in the VB group had a higher incidence of admission to NICU (51.43% vs. 68.49%, p = 0.017), lower 1-min (11.43% vs. 28.77%, p < 0.001) and 5-minute Apgar scores (1.43% vs. 4.11%, p = 0.043) for the second twin. However, after the adjustment for sex of the twin, birth weight, chorionicity, and gestational age, the greater risk of admission to NICU and low 5-min Apgar score was no longer significantly different. VB twins are at no greater overall risk of a poor outcome due to breech presentation in the second twin. However, the presentation of the second fetus represents a risk factor for a low 1-min Apgar score. Obstetricians and midwives should consider appropriate interventions for second twins who present breech versus vertex.

Glycemic control and neonatal outcomes in twin pregnancies with gestational diabetes mellitus

Preliminary data suggest that strict glycemic control in twin pregnancies with gestational diabetes mellitus may not improve outcomes but might increase the risk of fetal growth restriction. This study aimed to investigate the association of maternal glycemic control with the risk of gestational diabetes mellitus-related complications and small for gestational age in twin pregnancies complicated by gestational diabetes mellitus. This was a retrospective cohort study of all patients with a twin pregnancy complicated by gestational diabetes mellitus in a single tertiary center between 2011 and 2020, and a matched control group of patients with a twin pregnancy without gestational diabetes mellitus in a 1:3 ratio. The exposure was the level of glycemic control, described as the proportion of fasting, postprandial, and overall glucose values within target. Good glycemic control was defined as a proportion of values within target above the 50th percentile. The first coprimary outcome was a composite variable of neonatal morbidity, defined as at least 1 of the following: birthweight >90th centile for gestational age, hypoglycemia requiring treatment, jaundice requiring phototherapy, birth trauma, or admission to the neonatal intensive care unit at term. A second coprimary outcome was small for gestational age, defined as birthweight <10th centile or <3rd centile for gestational age. Associations between the level of glycemic control and the study outcomes were estimated using logistic regression analysis and were expressed as adjusted odds ratio with 95% confidence interval. A total of 105 patients with gestational diabetes mellitus in a twin pregnancy met the study criteria. The overall rate of the primary outcome was 32.4% (34/105), and the overall proportion of pregnancies with a small for gestational age newborn at birth was 43.8% (46/105). Good glycemic control was not associated with a reduction in the risk of composite neonatal morbidity when compared with suboptimal glycemic control (32.1% vs 32.7%; adjusted odds ratio, 2.06 [95% confidence interval, 0.77-5.49]). However, good glycemic control was associated with higher odds of small for gestational age compared with nongestational diabetes mellitus pregnancies, especially in the subgroup of diet-treated gestational diabetes mellitus (65.5% vs 34.0%, respectively; adjusted odds ratio, 4.17 [95% confidence interval, 1.74-10.01] for small for gestational age <10th centile; and 24.1% vs 7.0%, respectively; adjusted odds ratio, 3.97 [95% confidence interval, 1.42-11.10] for small for gestational age <3rd centile). In contrast, the rate of small for gestational age in gestational diabetes mellitus pregnancies with suboptimal control was not considerably different when compared with non-gestational diabetes mellitus pregnancies. In addition, in cases of diet-treated gestational diabetes mellitus, good glycemic control was associated with a left-shift of the distribution of birthweight centiles, whereas the distribution of birthweight centiles among gestational diabetes mellitus pregnancies with suboptimal control was similar to that of nongestational diabetes mellitus pregnancies. In patients with gestational diabetes mellitus in a twin pregnancy, good glycemic control is not associated with a reduction in the risk of gestational diabetes mellitus-related complications but may increase the risk of a small for gestational age newborn in the subgroup of patients with mild (diet-treated) gestational diabetes mellitus. These findings further question whether the gestational diabetes mellitus glycemic targets used in singleton pregnancies also apply to twin pregnancies and support the concern that applying the same diagnostic criteria and glycemic targets in twin pregnancies may result in overdiagnosis and overtreatment of gestational diabetes mellitus and potential neonatal harm.

Maternal and neonatal outcomes in women with twin pregnancies based on gestational weight gain: An updated systematic review and meta-analysis.

This updated systematic review and meta-analysis aimed to assess maternal and fetal outcomes of pregnancies based on the Institute of Medicine (IOM) guidelines of gestational weight gain (GWG). PubMED, SCOPUS, EMBASE and Web of Science were searched up to 30th July 2022. All studies evaluating maternal and/or neonatal outcomes of twin pregnancies based on the IOM guidelines of gestational weight gain were included. Twenty two studies were included. Mothers with twin pregnancies experiencing inadequate GWG showed higher incidence of gestational diabetes with the risk ratio (RR) 1.22 95% CI (0.95,1.57), p=0.0005, i2= 69% and premature rupture of membrane (PROM) with RR 1.14 95% CI (0.99, 1.30), p=0.07; i2=0% that coincided with higher rates of preterm birth, low birth weight, small for gestational age (SGA) and admission to NICU in neonates. Mothers with excessive GWG had higher risk of developing gestational hypertension with RR 1.59 95% CI (1.22, 2.07), p=0.0006, i2=75% and extremely preterm delivery (<32 weeks). Within the limitations of this review, GWG was found to be a predictable risk factor for adverse maternal and neonatal outcomes of twin pregnancies.

Race and Ethnicity and Disparities in Neonatal Outcomes in Twin Pregnancies [ID: 1375610

INTRODUCTION: Twin pregnancies are associated with adverse neonatal outcomes. We aimed to investigate disparities in neonatal outcomes by maternal race and ethnicity. METHODS: This was an IRB-approved, retrospective cohort of twin deliveries at a single institution between 2001 and 2018. Pregnancies delivered less than 23 weeks’ gestational age (GA), fetal demise, or major anomaly were excluded. The primary exposure, race and ethnicity, was self-reported as follows: non-Hispanic White, Hispanic, non-Hispanic Black, Asian/Pacific Islander, and other/mixed race. The primary outcome was neonatal intensive care unit (NICU) admission of at least one twin. Secondary outcomes included 5-minute Apgar less than 7 for either twin, GA at delivery, small for GA (SGA) neonate (&lt;10th percentile for GA), and NICU length of stay. Chi-square, ANOVA, and Student’s t test were performed for univariate analyses. Logistic regression modeling was performed to control for baseline differences. RESULTS: Eight hundred four twin pregnancies were identified; 48% of patients identified as non-Hispanic White, 30% as Hispanic, 10% as Asian/Pacific Islander, 5.6% as non-Hispanic Black, and 6.6% as other/mixed race. Age, parity, chorionicity, and body mass index differed between groups. The overall rate of NICU admission was 77.5% and did not differ by race and ethnicity (P=.05). Pregnancies with at least one SGA neonate varied significantly by race and ethnicity (P=.02). Gestational age at delivery, Apgar of less than 7, and ICU length of stay did not differ. CONCLUSION: The risk of having an SGA neonate varies by race and ethnicity in twin gestations, with highest rates among non-Hispanic Black women. Additional racial and ethnic disparities in neonatal morbidity were not found. Disparities in rate of preterm birth were not seen in this cohort.

Evaluating antenatal risk in twin pregnancies-A feasibility study to identify modifiable factors associated with adverse pregnancy outcomes.

Twin pregnancies have significantly higher rates of perinatal morbidity and mortality compared to singleton pregnancies; current attempts to reduce perinatal mortality have been less successful in twin pregnancies. The paucity of information about modifiable risk factors for adverse neonatal outcomes in twin pregnancies, as well as independent effects of chorionicity may have contributed to this outcome. This study aimed to explore the feasibility of an observational study to identify modifiable factors associated with adverse neonatal outcomes in twin pregnancies. Patients pregnant with twins at six UK hospitals between December 2019-March 2021 completed researcher-administered questionnaires at approximately 20-, 28- and 36-weeks' gestation, recording a wide range of self-reported social, lifestyle and demographic factors, alongside prospectively recorded clinical data from maternity records. Descriptive statistics were used to describe frequencies of exposures; logistic regression was used to determine whether factors were associated with a composite measure of adverse neonatal outcome. Data were collected from 65% (181/277) of eligible participants. A total of 98% (175) of participants had positive views about their participation. Some exposures, including cigarette smoking, supine sleep position and reduced fetal movements were less frequent in twin pregnancies compared to singletons, whereas fertility treatment was more common. Furthermore, different patterns of exposure were seen between monochorionic and dichorionic twins. This pilot study found some associations with adverse neonatal outcomes including: low BMI (OR 8.36, 95% CI: 1.02-68.87), maternal age ≥41 years (OR 9.0 95% CI: 1.07-75.84), maternally perceived high-stress levels (OR 1.96, 95% CI: 1.03-3.75) and inadequate antenatal screening (OR 1.44, 95% CI: 1.01-2.06). Sleep duration ≥9 h and right-sided going to sleep position were more frequent among pregnancies with adverse outcomes. Participants who reported receiving no information on fetal movement and reduced maternal perception of movements were more likely to have an adverse outcome, but sample size prohibited analysis based upon chorionicity. An observational study of modifiable factors in twin pregnancy is feasible. Differences in the frequencies of exposures between twin and singleton pregnancies highlight the need for twin-specific studies to identify modifiable factors and develop preventative strategies for morbidity and mortality in twin pregnancies.

Impact of Gestational Diabetes and Hypertension Disorders of Pregnancy on Neonatal Outcomes in Twin Pregnancies Based on Chorionicity.

The objective of this study was to investigate the impact of the co-existence of gestational diabetes (GDM) and hypertension disorders of pregnancy (HDP) on neonatal outcomes in twin pregnancies based on chorionicity. A retrospective study of 1398 women with twin pregnancies was performed between January 2016 and December 2021. The effects of GDM and HDP on neonatal outcomes were assessed by logistic regression models. An additional stratified analysis was conducted to estimate the effects based on chorionicity (monochorionic (MC) and dichorionic (DC)). The incidence of the co-existence of GDM and HDP was 3.8%. The presence of GDM increased the likelihood of HDP only in women with MC twin pregnancies (OR, 2.13; 95% CI 1.08-4.19). After adjustments, co-existence of GDM and HDP was positively associated with gestational age (β, 1.06; 95% CI 0.43-1.69) and birthweight (β, 174.90; 95% CI 8.91-340.89) in MC twin pregnancies, while no associations were found between co-existence of GDM and HDP and neonatal outcomes in DC twin pregnancies. However, HDP was negatively associated with birthweight (β, -156.97; 95% CI (-257.92, -56.02)) and positively associated with small-for-gestational-age (SGA) (OR, 2.03; 95% CI 1.02-4.03) and discordant twins (OR, 2.83; 95% CI 1.78-4.48) in DC twin pregnant women without GDM. Our results suggested that GDM leads to an increased risk of HDP only in MC twin pregnancies, but GDM seemed to attenuate the adverse effects of HDP on perinatal outcomes in both MC and DC twin pregnancies. Further investigation is needed to explain these intriguing findings.

Factors influencing neonatal outcomes in twin pregnancies undergoing cesarean section: a cross-sectional study

This study aimed to evaluate maternal and fetal characteristics and factors affecting fetal outcomes in twin pregnancies delivered by cesarean section. This was a cross-sectional study in a tertiary care referral hospital. The primary outcome was to ascertain the effects of independent factors on the 1st and 5th minute APGAR scores, neonatal intensive care unit admissions, the need for mechanical ventilation, and neonatal mortality. A total of 453 pregnant women and 906 newborns were included in the analysis. The final logistic regression model revealed that early gestational weeks and neonates <3rd weight percentile at the time of delivery were the most significant predictors of all poor outcome parameters in at least one of the twins (p<0.05). General anesthesia for cesarean section was associated with 1st minute APGAR<7 and the need for mechanical ventilation, and emergency surgery was correlated with the need for mechanical ventilation (p<0.05) in at least one of the twins. General anesthesia, emergency surgery, early gestational weeks, and birth weight <3rd weight percentile were strongly associated with poor neonatal outcomes in at least one of the twins delivered by cesarean section.

Ultrasound-Indicated Cerclage in Twin Pregnancies: A Cohort Study.

To report the pregnancy and neonatal outcomes in patients with twin pregnancies who underwent ultrasound-indicated cerclage (UIC) and to compare them to patients with singleton pregnancies undergoing the same procedures. Patients who underwent UIC between January 2010 and December 2020 at Kangnam Sacred Heart Hospital were reviewed. We compared characteristics, pregnancy, and neonatal outcomes between patients with singleton and twin pregnancies. A total of 94 women (56 singleton and 38 twin pregnancies) underwent UIC were included. The mean gestational age (GA) at cerclage and preoperative cervical length (CL) were not significantly different. Twin pregnancies were more likely to deliver at earlier median gestations than singletons (singleton, 36 + 1 weeks vs twin, 32 + 6 weeks, and p = 0.004). The frequency of preterm delivery <34 weeks in twin group was higher than in singleton group (15 (26.8%) vs 20 (52.6%) and p =0.016). However, the frequency of preterm delivery <32, <28, and <24 weeks was not significantly different between two groups. Although neonatal weights in singleton pregnancies were heavier than twin pregnancies, neonatal mortality and morbidities were not significantly different between two groups. Among various factors contributing to preterm birth, preoperative CL ≤ 15 mm was independently associated with a higher risk of preterm delivery before 34 weeks. Furthermore, pregnancy and neonatal outcomes of twin pregnancies with cervical length ≤ 15 mm are comparable with those of singleton pregnancies (GA at delivery, singleton, 35 + 1 weeks vs twin, 32 + 5 weeks, and p = 0.24; neonatal mortality, singleton, 3.4% vs twin, 4.8%, and p = 0.64). The pregnancy and neonatal outcomes of UIC in twin pregnancies were comparable to those in singleton pregnancies, especially when CL is ≤15 mm. UIC might be considered a safe procedure for twin pregnancies.

Impact of maternal body mass index and gestational weight gain on maternal and neonatal outcomes in twin pregnancies.

To date, there have only been provisional recommendations about the appropriate gestational weight gain in twin pregnancies. This study aimed to contribute evidence to this gap of knowledge. Using a cohort of 10 603 twin pregnancies delivered between 2000 and 2015 in the state of Hessen, Germany, the individual and combined impact of maternal body mass index and gestational weight gain on maternal and neonatal outcomes was analyzed using uni- and multivariable logistic regression models. The analysis used newly defined population-based quartiles of gestational weight gain in women carrying twin pregnancies (Q1: <419.4g/week [low weight gain], Q2-Q3: 419.4-692.3g/week [optimal weight gain], Q4: >692.3g/week [high weight gain]) and the World Health Organization body mass index classification. Pre-pregnancy body mass index ≥25 kg/m2 was associated with significantly increased rates of cesarean deliveries (aOR1.2, 95% CI: 1.01-1.41) and pregnancy-induced hypertensive disorders (aOR 1.53, 95% CI: 1.11-2.1) but not with any adverse neonatal outcome. Perinatal mortality (aOR 2.23, 95% CI: 1.38-3.6), preterm birth (aOR 1.88, 95% CI: 1.58-2.25), APGAR'5 < 7 (aOR 1.61, 95% CI: 1.19-2.17) and admissions to the neonatal intensive care unit (aOR 1.6, CI: 1.38-1.85) were increased among women with low gestational weight gain. Rates of cesarean deliveries were high in both women with low (aOR 1.25, 95% CI: 1.05-1.48) and high gestational weight gain (aOR 1.17, 95% CI: 1.01-1.35). A high gestational weight gain was also associated with higher rates of hypertensive disorders in pregnancy (aOR 2.32, 95% CI: 1.79-3.02) and postpartum hemorrhage (aOR 1.72, 95%CI: 1.12-2.63). The risk of preterm birth, low Apgar scores and NICU admissions showed a converse linear relation with pre-pregnancy body mass index in women with low gestational weight gain. In twin pregnancies, nonoptimal weekly maternal weight gain seems to be strongly associated with maternal and neonatal adverse outcomes. Since gestational weight gain is a modifiable risk factor, health care providers have the opportunity to counsel pregnant women with twins and target their care accordingly. Additional research to confirm the validity and generalizability of our findings in different populations is warranted.

Adverse outcomes associated with twin pregnancies conceived via in vitro fertilization

Objective To compare adverse pregnancy and neonatal outcomes in twin pregnancies conceived by in vitro fertilization (IVF) to those conceived spontaneously. Methods Retrospective analysis of the Centers for Disease Control and Prevention, Natality Live Birth database for the years 2016–2019. All twin live births were included and stratified into two groups: those from pregnancies conceived via IVF and those from pregnancies conceived spontaneously. The incidence of several adverse pregnancy and neonatal outcomes were compared between the two groups. Statistical analysis included multivariable logistic regression to adjust for the following potential confounders: maternal age, race/ethnicity, body mass index, education level, type of medical insurance, chronic hypertension, pregestational diabetes, and prior preterm birth. Data were presented as adjusted odds ratios (aOR) with 95% confidence intervals (CI). Results Twin live births from pregnancies conceived via IVF comprised 9.5% of the study cohort (39,356 of 415,560). Baseline characteristics varied significantly between IVF and spontaneously conceived twins. After adjusting for these variables, IVF in twins was associated with an increased risk of multiple adverse outcomes including gestational diabetes (aOR = 1.35, 95% CI = 1.30–1.39), hypertensive disorders of pregnancy (aOR = 1.70, 95% CI = 1.65–1.75), preterm birth prior to 28 weeks (aOR = 1.53, 95% CI = 1.43–1.63), maternal intensive care unit admission (aOR = 2.03, 95% CI = 1.79–2.31), maternal blood transfusion (aOR = 2.97, 95% CI = 2.75–3.20), unplanned hysterectomy (aOR = 3.37, 95% CI = 2.73–4.16), and prolonged ventilation in newborns (aOR = 1.76, 95% CI = 1.69–1.82), compared to spontaneously conceived twin pregnancies. Conclusions Based on this large United States population-based cohort, twin pregnancies conceived via IVF represent a subgroup of twins that have an increased risk for several adverse pregnancy and neonatal outcomes, compared to those conceived spontaneously. With increased contemporary utilization of IVF, obstetricians should consider these risks while caring for patients with twin pregnancies conceived via IVF.

Comparison of maternal and neonatal outcomes in twin pregnancies according to delivery types: vaginal delivery or Cesarean delivery?

Objective: Our aim was to compare the maternal and neonatal outcomes of twin pregnancies, which result in vaginal delivery (VD) and Cesarean section (CS), and the factors affecting the decision of CS. Methods: Twin pregnancies between 30 and 39 weeks who gave birth in a tertiary center were included in the present study. The demographic data and maternal and neonatal outcomes of the patient groups who gave birth &lt;32 weeks, 32–37 weeks, and &gt;37 weeks were recorded and compared according to the type of birth. Results: A total of 1209 patients were included in the study. The 1- and 5-minute Apgar scores of the 1st and 2nd fetuses in twin pregnancies &lt;32 weeks of gestation were higher in the CS group at a statistically significant level (p=0.007, p=0.010, p=0.001, and p=0.003, respectively). The 1- and 5-minute Apgar scores of the 2nd fetuses of the pregnant women &gt;37 weeks of age were higher in the VD group at a statistically significant level (p=0.039 and p=0.032, respectively). The newborn intensive care unit (NICU) admission rates of 1st fetus and 2nd fetus in the groups of &lt;32 weeks, 32–37 weeks, and &gt;37 weeks were higher in those born by CS at a statistically significant level when compared to those born by VD (1st fetus p&lt;0.001, p&lt;0.001, p=0.016, respectively; 2nd fetus p&lt;0.001, p&lt;0.001, p=0.012, respectively). Conclusion: It must be kept in mind that twin pregnancies have high risks. However, vaginal delivery can be considered as a safe and reasonable option in appropriately selected cases and in the presence of experienced obstetricians by being careful about maternal and neonatal complications which might occur.

Twin pregnancy following a short interpregnancy interval: Maternal and neonatal outcomes

ObjectiveTo evaluate maternal and neonatal outcomes of women with twin pregnancies following a short interpregnancy interval (IPI < 6 months).Study design.A retrospective computerized database study in a single tertiary medical center between 2005 and 2021. Women who had an index singleton delivery and a subsequent twin gestation in their next pregnancy at the Shaare Zedek Medical Center (SZMC) were included. Maternal and neonatal outcomes of twin pregnancies following a short IPI (<6 months) were compared to those with an optimal IPI (18–48 months). Univariate analysis was followed by multiple logistic regression models; adjusted odds ratios (aORs) and 95 % confidence intervals (CIs) were calculated. ResultsDuring the study period, 2,079 women had an index singleton delivery followed by a twin gestation in their next pregnancy recorded at our medical center; 116 (5.9 %) had a history of short IPI, and 1,057 (50.8 %) had a history of optimal IPI. Women with a history of short IPI had higher rates of preterm labor < 37 weeks and < 34 weeks, NICU admissions and prolonged hospital stay of the first and second fetuses, mechanical ventilation of the first fetus, 1 and 5 Minute Apgar score lower than 7 of the second fetus and lower rates of elective cesarean delivery. An adjusted multivariate analysis showed that a history of short IPI was not an independent risk factor for preterm birth either < 34 weeks or < 37 weeks or for composite adverse neonatal outcome of the first and second twin. ConclusionTwin pregnancy following a short IPI was not associated with neither preterm labor nor composite adverse neonatal outcome.

Neonatal outcomes of twins &lt;29 weeks gestation of mothers with hypertensive disorders of pregnancy.

Hypertensive disorders of pregnancy (HDP) are associated with dysfunctional placentation and are a major cause of maternal and neonatal morbidity and mortality. Twin pregnancies have a larger placental mass and are a risk factor for HDP. The effect of HDP on neonatal outcomes in twin pregnancies is unknown. Retrospective cohort study using the Canadian Neonatal Network database from 2010-2018 of twin infants &lt;29 weeks gestation born to mothers with HDP and normotensive pregnancies. Using multivariable models, we determined adjusted odds ratios (AORs) and 95% confidence intervals (CI) for mortality, bronchopulmonary dysplasia, severe neurologic injury, severe retinopathy of prematurity (ROP), necrotizing enterocolitis, and nosocomial infection in twin infants of mothers with HDP compared to twin infants of normotensive mothers. Of the 2414 eligible twin infants &lt;29 weeks gestational age, 164 (6.8%) were born to mothers with HDP and had higher odds of severe ROP (AOR 2.48, 95% CI 1.34-4.59). Preterm twin infants born to mothers with HDP also had higher odds of mortality (AOR 2.02, 95% CI 1.23-3.32). There was no difference in other outcomes. Preterm twin infants &lt;29 weeks gestation of HDP mothers have higher odds of severe ROP and mortality. Hypertensive disorders of pregnancy, associated with placental dysfunction, are a major cause of maternal and neonatal morbidity and mortality. Twin pregnancy, associated with a larger placental mass, is a risk factor for hypertensive disorders of pregnancy. The effect of hypertensive disorders of pregnancy on outcomes of preterm twins is unknown. Preterm twins of mothers with hypertensive disorders of pregnancy are at higher risk of severe retinopathy of prematurity and mortality. Our data can be used to counsel parents and identify infants at higher risk of severe retinopathy of prematurity and mortality.

Adverse neonatal outcome in twin pregnancy complicated by small-for-gestational age: twin vs singleton reference charts.

The use of twin-specific vs singleton growth charts in the assessment of twin pregnancy has been controversial. The aim of this study was to assess whether a diagnosis of small-for-gestational age (SGA) made using twin-specific estimated-fetal-weight (EFW) and birth-weight (BW) charts is associated more strongly with adverse neonatal outcomes in twin pregnancies, compared with when the diagnosis is made using singleton charts. This was a cohort study of twin pregnancies delivered at St George's Hospital, London, between January 2007 and May 2020. Twin pregnancies complicated by intrauterine death of one or both twins, fetal aneuploidy or major abnormality, twin-twin transfusion syndrome or twin anemia-polycythemia sequence and those delivered before 32 weeks' gestation, were excluded. SGA was defined as EFW or BW below the 10th centile, and was assessed using both twin-specific and singleton EFW and BW charts. The main study outcome was composite adverse neonatal outcome. Mixed-effects logistic regression analysis with random pregnancy-level intercepts was used to test the association between SGA classified using the different charts and adverse neonatal outcome. A total of 1329 twin pregnancies were identified, of which 913 (1826 infants) were included in the analysis. Of these pregnancies, 723 (79.2%) were dichorionic and 190 (20.8%) were monochorionic. Using the singleton charts, 33.3% and 35.7% of pregnancies were classified as SGA based on EFW and BW, respectively. The corresponding values were 5.9% and 5.6% when using the twin-specific charts. Classification as SGA based on EFW using the twin charts was associated significantly with composite adverse neonatal outcome (odds ratio (OR), 4.78 (95% CI, 1.47-14.7); P = 0.007), as compared with classification as appropriate-for-gestational age (AGA). However, classification as SGA based on EFW using the singleton standard was not associated significantly with composite adverse neonatal outcome (OR, 1.36 (95% CI, 0.63-2.88); P = 0.424). Classification as SGA based on EFW using twin-specific standards provided a significantly better model fit than did using the singleton standard (likelihood ratio test, P < 0.001). When twin-specific charts were used, classification as SGA based on BW was associated significantly with a 9.3 times increased odds of composite adverse neonatal outcome (OR, 9.27 (95% CI, 2.86-30.0); P < 0.001). Neonates classified as SGA according to the singleton BW standard but not according to the twin-specific BW standards had a significantly lower rate of composite adverse neonatal outcome than did AGA twins (OR, 0.24 (95% CI, 0.07-0.66); P = 0.009). The singleton charts classified one-third of twins as SGA, both prenatally and postnatally. Infants classified as SGA according to the twin-specific charts, but not those classified as SGA according to the singleton charts, had a significantly increased risk of adverse neonatal outcome compared with infants classified as AGA. This study provides further evidence that twin-specific charts perform better than do singleton charts in the prediction of adverse neonatal outcome in twin pregnancies. The use of these charts may reduce misclassification of twins as SGA and improve identification of those that are truly growth restricted. © 2021 International Society of Ultrasound in Obstetrics and Gynecology.