妊娠期营养不良对大鼠糖、脂代谢及子代出生体重的影响

目的 研究妊娠期营养不良(营养过剩及营养不足)对大鼠糖、脂代谢及子代出生体重的影响.方法 Wistar大鼠从确定妊娠第1天起按摄入食物的不同,分别分为高脂高热量组、正常饮食组及低热量饮食组,每组10只.比较孕鼠妊娠期体重变化以及妊娠晚期血清甘油三酯、高密度脂蛋白、低密度脂蛋白、空腹血糖、胰岛素的水平、口服葡萄糖耐量试验和胰岛素释放试验结果的差异,观察各组子代出生体重及仔鼠巨大儿和低体重的发生率.采用单因素方差分析、LSD或DunnettT3检验、卡方检验进行统计学分析.结果 高脂高热量饮食组大鼠妊娠期体重明显增加,妊娠晚期血清甘油三酯及低密度脂蛋白分别为(1.68±0.13) mmol/L及(0.57±0.04) mmol/L,均高于正常饮食组[(0.78±0.08) mmol/L及(0.35±0.07) mmol/L),P均＜0.01],而高密度脂蛋白低于正常饮食组[(0.56±0.06) mmol/L与(1.09±0.08) mmol/L,P＜0.05];低热量饮食组甘油三酯、低密度脂蛋白及高密度脂蛋白分别为[(0.47±0.06) mmol/L、(0.21±0.06) mmol/L及(0.42±0.05) mmol/L],均低于正常饮食组(P均＜0.05).营养不良组(高脂高热量饮食组和低热量饮食组)孕鼠均出现了糖耐量受损,口服葡萄糖耐量试验和胰岛素释放试验异常;高脂高热量饮食组鼠妊娠晚期空腹血糖高于正常饮食组[(6.63±0.53) mmol/L与(4.90±0.26) mmol/L,P＜0.05],低热量饮食组空腹血糖为(4.18±0.26) mmol/L,与正常饮食组比较,差异无统计学意义(P＞0.05).3组孕鼠妊娠晚期空腹血清胰岛素水平比较,差异均无统计学意义.高脂高热量饮食组子代平均出生体重高于正常饮食组[(6.14±0.31)g与(5.73±0.26)g,P＜0.05],仔鼠巨大儿发生率高于正常饮食组[19.20％(19/99)与7.84％(8/102),P＜0.05];低热量饮食组子代平均出生体重为(4.54±0.23)g,低于正常饮食组(P＜0.05),仔鼠巨大儿发生率为13.40％(11/76),高于正常饮食组(P＜0.05);低体重儿发生率高于正常饮食组[15.90％(13/76)与3.92％(4/102),P＜0.05];仔鼠总数量少于正常饮食组(76只与102只)(P＜0.05),高脂高热量饮食组仔鼠总数量为99只,少于正常饮食组,但差异无统计学意义(P＞0.05).结论 妊娠期营养不良可引起大鼠妊娠期脂质代谢异常、糖耐量受损和胰岛素抵抗,同时也对子代出生体重,包括仔鼠巨大儿及低体重儿的发生率产生不良影响.     

Obstetric and perinatal outcome in women with twin pregnancy and gestational diabetes

Objective: The aim of this study was to evaluate pregnancy complications and obstetric and perinatal outcomes in women with twin pregnancy and GDM. Study Design: An observational multicentre retrospective study was performed and 534 pregnant woman and 1068 twins infants allocated into two groups, 257 with GDM and 277 controls, were studied. Main Outcome Measures: Pregnant women characteristics, hypertensive complications, preterm delivery rate, mode of delivery and birthweight were analysed. Results: Pregnant women with GDM were older (p?<?0.001) and had higher body mass index (p?<?0.001) than controls. GDM was associated with higher risk of prematurity in twin pregnancy (odds ratio 1.64, 95% confidence interval [1.14–2.32], p?=?0.005). This association was based on the association with other pregnancy complications. Birthweight Z-scores were significantly higher in the GDM group (p?=?0.02). The rate of macrosomia was higher in the GDM group (p?=?0.002) and small for gestational age (SGA) babies were significantly less frequent (p?=?0.03). GDM was an independent predictor of macrosomia (p?=?0.006). Conclusion: The presence of GDM in twin pregnancy was associated with a higher risk of hypertensive complications, prematurity and macrosomia, but significantly reduces the risk of SGA infants. Prematurity was related to the presence of other associated pregnancy complications.     

Excessive gestational weight gain predicts large for gestational age neonates independent of maternal body mass index

Objective: To determine the effects of maternal pre-pregnancy body mass index (BMI) and gestational weight gain (GWG) on large-for-gestational-age (LGA) birth weight (≥90th % ile). Methods: We examined 4321 mother-infant pairs from the Ottawa and Kingston (OaK) birth cohort. Multivariate logistic regression (controlling for gestational and maternal age, pre-pregnancy weight, parity, smoking) were performed and odds ratios (ORs) calculated. Results: Prior to pregnancy, a total of 23.7% of women were overweight and 16.2% obese. Only 29.3% of women met GWG targets recommended by the Institute of Medicine (IOM), whereas 57.7% exceeded the guidelines. Adjusting for smoking, parity, age, maternal height, and achieving the IOM’s recommended GWG, overweight (OR 1.99; 95%CI 1.17–3.37) or obese (OR 2.64; 95% CI 1.59–4.39) pre-pregnancy was associated with a higher rate of LGA compared to women with normal BMI. In the same model, exceeding GWG guidelines was associated with higher rates of LGA (OR 2.86; 95% CI 2.09–3.92), as was parity (OR 1.49; 95% CI 1.22–1.82). Smoking (OR 0.53; 95%CI 0.35–0.79) was associated with decreased rates of LGA. The adjusted association with LGA was also estimated for women who exceeded the GWG guidelines and were overweight (OR 3.59; 95% CI 2.60–4.95) or obese (OR 6.71; 95% CI 4.83–9.31). Conclusion: Pregravid overweight or obesity and gaining in excess of the IOM 2009 GWG guidelines strongly increase a woman’s chance of having a larger baby. Lifestyle interventions that aim to optimize GWG by incorporating healthy eating and exercise strategies during pregnancy should be investigated to determine their effects on LGA neonates and down-stream child obesity.     

Increased composite maternal and neonatal morbidity associated with ultrasonographically suspected fetal macrosomia

Objective: To determine the composite risk of maternal and neonatal morbidity in pregnancies with suspected fetal macrosomia. Methods: In a retrospective study of laboring women delivering singleton, term neonates, we defined 3 groups of patients by estimated fetal weight (EFW) in grams, using ultrasound: (1) <4000, (2) 4000–4499, and (3) 4500+, and tested them for association with a composite outcome using multivariable logistic regression models. The measure of composite morbidity included: shoulder dystocia, third/fourth degree perineal laceration, postpartum hemorrhage, maternal length of stay (LOS)≥ 5 days, neonatal birth trauma, meconium aspiration syndrome, perinatal infection, and neonatal LOS ≥ 5 days. Because of potential interactions between diabetes and birthweight, women with maternal diabetes were examined separately. Results: Of 8,843 deliveries, the proportion with composite morbidity by group was: (1): 26.2%, (2): 41.2%, and (3): 63.6% (p < 0.0001). The OR (95% CI) for groups (2) and (3) were: 1.9 (1.2–2.9) and 2.1 (0.6–7.2), for diabetics (9.7% of the final study population), and 2.3 (1.9–2.7) and 3.9 (2.2–6.9), for non-diabetics. Conclusions: Suspected fetal macrosomia appeared associated with increased risk for a composite measure of childbirth morbidity.     

Increasing pre-pregnancy body mass index is predictive of a progressive escalation in adverse pregnancy outcomes

Objective: To evaluate the association between pre-pregnancy body mass index (BMI) and adverse pregnancy outcomes using a large administrative database. Methods: Retrospective cohort study of California women delivering singletons in 2007. The association between pre-pregnancy BMI category and adverse outcomes were evaluated using multivariate logistic regression. Results: Among 436,414 women, increasing BMI was associated with increasing odds of adverse outcomes. Obese women (BMI?=?30–39.9) were nearly 3x more likely to have gestational diabetes (OR?=?2.83, 95% CI?=?2.74–2.92) and gestational hypertension/preeclampsia (2.68, 2.59–2.77) and nearly twice as likely to undergo cesarean (1.82, 1.78–1.87), when compared to normal BMI women (BMI?=?18.5–24.9). Morbidly obese women (BMI ≥ 40) were 4x more likely to have gestational diabetes (4.72, 4.46–4.99) and gestational hypertension/preeclampsia (4.22, 3.97–4.49) and nearly 3x as likely to undergo cesarean (2.60, 2.46–2.74). Conclusion: There is a strong association between increasing maternal BMI and adverse pregnancy outcomes. This information is important for counseling women regarding the risks of obesity in pregnancy.     

Waiting for postterm in healthy women,is it an accident waiting to happen?

Abstract

Objective: To establish whether postterm pregnancies are associated with adverse perinatal outcomes in a linear fashion.

Study design: A retrospective cohort study investigating perinatal outcomes in singleton term (≥37 weeks gestation) and postterm pregnancies was conducted. Deliveries occurred between the years 1988 and 2010. Parturients were classified into three groups according to their gestational age: 37–39?+?6, 40–41?+?6 and over 42 weeks’ gestation (postterm). Statistical analysis included multiple logistic regression model to control for possible confounders.

Results: Out of 202?462 deliveries, meeting the inclusion criteria, during the study period, 47.7% occurred at 37–39?+?6 weeks, 47.4% occurred at 40–41?+?6 weeks and 4.9% were postterm. Fertility treatments, diabetes mellitus, hypertensive disorders, intrauterine growth restriction (IUGR) and premature rupture of membranes (PROM) were less likely to be associated with postterm pregnancies. However, postterm was found as a significant risk factor for labor complications and adverse perinatal outcome including perinatal mortality. Using a multivariable logistic regression model, controlling for confounders such as maternal age and macrosomia, postterm was found to be an independent risk factor for perinatal mortality (adjusted OR?=?1.5; 95% CI?=?1.20–2.0; p?<?0.001).

Conclusion: Although postterm pregnancies were less likely to be associated with obstetrical risk factors and complications such as fertility treatments, diabetes mellitus, hypertensive disorders, IUGR and PROM, postterm is an independent risk factor for perinatal mortality.     

Beckwith–Wiedemann syndrome with overlapping Perlman syndrome manifestation

Abstract

Beckwith–Wiedemann syndrome (BWS) is an overgrowth syndrome known as exomphalos-macroglossia – gigantism syndrome. Prognosis is good, prenatal diagnosis is important for pregnancy management but might be difficult due to clinical overlap with other syndromes. Perlman syndrome is an overgrowth syndrome with high perinatal mortality, most frequent antenatal findings include polyhydramnios, macrosomia, visceromegaly, nephromegaly and foetal ascites. Authors present a case of prenatally diagnosed BWS with severe ascites as first antenatal finding and lethal course, signs more typical of Perlman syndrome. This combination of clinical signs has not been published yet and may contribute to specification of possible prenatal manifestation of BWS.     

Infant feeding practices among macrosomic infants: A prospective cohort study

The health benefits of breastfeeding are well recognised, but breastfeeding rates worldwide remain suboptimal. Breastfeeding outcomes have yet to be explored among women who give birth to macrosomic (birthweight ≥4000 g) infants, a cohort for whom the benefits of breastfeeding may be particularly valuable, offering protection against later‐life morbidity associated with macrosomia. This longitudinal prospective cohort study aimed to identify whether women who give birth to macrosomic infants are at greater risk of breastfeeding non‐initiation or exclusive breastfeeding (EBF) cessation. A total of 328 women in their third trimester were recruited from hospital and community settings and followed to 4 months post‐partum. Women gave birth to 104 macrosomic and 224 non‐macrosomic (<4000 g) infants between 2018 and 2020. Longitudinal logistic regression models calculated odds ratios (ORs) and 95% confidence intervals (CIs) to assess likelihood of EBF at four timepoints post‐partum (birth, 2 weeks, 8 weeks, and 4 months) between women who gave birth to macrosomic and non‐macrosomic infants, adjusted for maternal risk (obesity and/or diabetes), ethnicity and mode of birth. Macrosomic infants were more likely to be exclusively breastfed at birth and 2 weeks post‐partum than non‐macrosomic infants with adjusted OR = 1.94 (95% CI: 0.90, 4.18; p = 0.089) and 2.13 (95% CI: 1.11, 4.06; p = 0.022), respectively. There were no statistically significant associations between macrosomia and EBF at 8 weeks or 4 months post‐partum. Macrosomia may act as a protective factor against early formula‐milk supplementation, increasing the likelihood of EBF in the early post‐partum period, but rates of exclusive breastfeeding continued to decline over the first 4 months post‐partum.     

The risk of shoulder dystocia related permanent fetal injury in relation to birth weight

OBJECTIVE: To examine birth weight related risks of fetal injury in connection with shoulder dystocia. STUDY DESIGN: The investigation was based on a retrospective analysis of 316 fetal neurological injuries associated with deliveries complicated by arrest of the shoulders that occurred across the United States. RESULTS: The study revealed that the distribution of birthweights for the high risk shoulder dystocia population differs from the standard birthweight distribution. The relative difference per birthweight interval is used to adjust an assumed 1:1000 baseline risk of injury due to shoulder dystocia following vaginal deliveries. These adjusted risks show a need to consider new thresholds for elective cesarean delivery. CONCLUSIONS: Current North American and British guidelines, that set 5000 g as minimum estimated fetal weight limit for elective cesarean section in non-diabetic and 4500 g for diabetic gravidas, may expose some macrosomic fetuses to a high risk of permanent neurological damage. The authors present the opinion that the mother, having been informed of the risks of vaginal versus abdominal delivery, should be allowed to play an active role in the critical management decisions.     

Shoulder dystocia related fetal neurological injuries: the predisposing roles of forceps and ventouse extractions

On the basis of 333 documented cases of permanent perinatal neurological damage, associated with arrest of the shoulders at birth, the authors conducted a retrospective study in order to evaluate the predisposing role, if any, of the utilization of extraction instruments. The investigation revealed that 35% of all injuries occurred in neonates delivered by forceps, ventouse or sequential ventouse–forceps procedures. This frequency was several-fold higher than the prevailing instrument use in the practices of American obstetricians during the same years. A high rate of forceps and ventouse extractions was demonstrable in all birth weight categories. Average weight and moderately large for gestational age fetuses underwent instrumental extractions more often than grossly macrosomic ones. This circumstance indicates that forceps and ventouse are independent risk factors, unrelated to fetal size. Their use entailed central nervous system injuries significantly more often than did spontaneous deliveries. The findings suggest that extraction procedures may be as important as macrosomia among the factors that lead to neurological damage in the child in connection with shoulder dystocia. Because they augment the intrinsic dangers of excessive fetal size exponentially, the authors consider their use in case of ≥4,000 g estimated fetal weight inadvisable. Sequential forceps–ventouse utilization further doubles the risks and is, therefore, to be avoided in all circumstances.