title: A meta-analysis of maternal and fetal outcomes of pregnancy after bariatric surgery.
abstract: BACKGROUND
  The effects of bariatric surgery (BS) on outcomes in subsequent pregnancies are unclear.
  
  
  OBJECTIVE
  To compare maternal and fetal outcomes among women who become pregnant after BS and obese women who have not undergone BS before pregnancy.
  
  
  METHODS
  PubMed and Embase were searched for relevant reports, and the reference lists of identified articles were hand-searched.
  
  
  METHODS
  Cohort studies that compared outcomes among women who had undergone any type of BS and obese women who had not undergone surgery were included when results were reported as risk ratios or odds ratios (ORs).
  
  
  METHODS
  Summary ORs were estimated using a random effects model.
  
  
  RESULTS
  Eleven studies were included. Compared with obese women who had not undergone BS, women who had undergone BS had significantly lower odds of gestational diabetes (OR 0.31; 95% CI 0.15-0.65), hypertensive disorders (OR 0.42; 95% CI 0.23-0.78), and macrosomia (OR 0.40; 95% CI 0.24-0.67). However, their odds of small-for-gestational-age newborns were increased (OR 2.16; 95% CI 1.28-3.66). No significant differences were recorded for cesarean, postpartum hemorrhage, and preterm delivery.
  
  
  CONCLUSIONS
  BS reduces the odds of some adverse maternal and fetal outcomes among obese women.
authors: Department of Endocrinology, First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Xiao-yan
authors: XY
authors: Yi
authors: Department of Endocrinology, First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Qi-fu
authors: QF
authors: Li
authors: Department of General Surgery, First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
authors: Jun
authors: J
authors: Zhang
authors: Department of Endocrinology, First Affiliated Hospital of Chongqing Medical University, Chongqing, China. Electronic address: towzh713@126.com.
authors: Zhi-hong
authors: ZH
authors: Wang
mesh_terms: D000328:Adult; D050110:Bariatric Surgery; D002585:Cesarean Section; D016640:Diabetes, Gestational; D005260:Female; D005320:Fetal Macrosomia; D006801:Humans; D046110:Hypertension, Pregnancy-Induced; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D033261:Maternal-Fetal Relations; D009765:Obesity / Q000601:surgery*; D016017:Odds Ratio; D011247:Pregnancy; D011248:Pregnancy Complications; D011256:Pregnancy Outcome; D047928:Premature Birth
keywords: Bariatric surgery; Meta-analysis; Obesity; Outcome; Pregnancy