Effects of Vaginal Seeding on Infants' Body Mass Index and Allergy Risk for Caesarean-delivered Children: A Randomized Controlled Study
试验速览
- 阶段
- 不适用
- 发起方
- 入组人数
- 117
- 试验地点
- 1
- 主要终点
- infant's body mass index
研究概览
简要总结
This is a single-blind randomized controlled trial, aiming to evaluate the effects of vaginal seeding on body mass index as well as allergy risk for cesarean-delivered infants. It will be conducted in Liuyang city of China, and the targeted sample size is 106. All the eligible pregnant women will be randomly assigned to either the intervention or control group, and their babies of the participants will be followed up to 24 months of age.
详细描述
Many studies have suggested that caesarean-delivered children are at higher risks of developing metabolic and allergic diseases like obesity and asthma, possibly because newborns born by caesarean section were lack of exposure to maternal vaginal flora. It is needed to explore a simple, convenient, and safe intervention strategy to reduce caesarean-related risks. In a recent non-randomized study, the authors found that exposure of caesarean-delivered newborns to maternal vaginal fluid at birth (i.e., vaginal seeding) could partially restore the microbiota of them at 30 days after births, but the long-term health consequences of restoring the microbiota of caesarean-delivered infants remain unclear.
In this randomized study, the investigators aim to examine whether the changes in newborns' microbiota will persist to 24 month of age, and whether vaginal seeding will have any effects on body mass index and allergy risk from birth to 24 months of age. the investigators will enroll a total of 106 pregnant women, and the participants' infants will be followed up at 0 (before hospital discharge), 6, 12, 18 and 24 months. At each follow-up visit, a questionnaire survey including information on feeding, medication, and allergic status will be conducted, infants' height and weight will be measured, and feces will be collected. At 18-month-old visit, infants' venous blood will be also collected for the assay of multiallergen. The primary outcomes were body mass index and allergy risk index. The secondary outcomes included the microbiota profile, allergic symptoms and diseases, overweight/obesity, and adverse effects.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Single (Outcomes Assessor)
入排标准
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •local resident in Liuyang city
- •Singleton, term pregnancy (≥37 weeks of gestation)
- •Cesarean section before labor starts without maternal complications, or cesarean section after the start of labor but the cervix is less than 3 cm
- •Vaginal pH< 4.5 at enrollment
排除标准
- •Positive testing for HIV, HBV, syphilis or GBS infection at gestation
- •Vaginal infections such as genital herpetic lesions or chlamydia
- •Bacterial vaginosis
- •Trichomonas or fungous in leucorrhea
- •Pregnant women or her spouse with severe allergic diseases, such as asthma and severe drug allergy
- •Vaginal pH ≥4.5 at 1-2 hours before the cesarean section
- •Other conditions not suitable for intervention as judged by obstetricians
结局指标
主要结局
infant's body mass index
时间窗: At 24 months
Body mass index in original scale and z-score
infant's allergy risk score
时间窗: At 18 months after birth
Calculated based on the measurements of multiallergens with 0-6 classes,higher values represent a worse outcome which means more susceptible to allergic diseases
次要结局
- Rate of allergic symptoms and common allergic diseases(At 61, 12 ,18 and 24 months)
- Infants' gut microbiota profile(At baseline (Meconium), 6, 12 ,18 and 24 months after birth)
- Rate of overweight/obesity(At 6, 12 ,18 and 24months)
- Rate of adverse effects(From birth to 24 months)
研究者
Jianmeng Liu
Professor in Perinatal Epidemiology
Peking University