title: Obstetric outcome of in vitro fertilized pregnancies complicated by severe ovarian hyperstimulation syndrome: a multicenter study.
abstract: OBJECTIVE
  To assess the outcome of pregnancies conceived with the use of IVF that are complicated by severe ovarian hyperstimulation syndrome (OHSS).
  
  
  METHODS
  A retrospective nationwide multicenter study.
  
  
  METHODS
  Sixteen of 19 tertiary care medical centers in Israel.
  
  
  METHODS
  All patients undergoing IVF who were hospitalized for severe OHSS between January 1987 and December 1996.
  
  
  METHODS
  Pregnancy rate (PR) and rates of multiple gestation, miscarriage, ectopic pregnancy, obstetric complications, and intervention.
  
  
  RESULTS
  A total of 163 patients who had severe OHSS after IVF treatment were identified, of whom 142 (87.1%) had undergone ET. The clinical PR was 73.2%; 42.3% were singletons, 33.6% were twins, 17.3% were triplets, and 6.7% were quadruplets. The miscarriage rate was 29.8%, whereas the incidence of ectopic pregnancy was 1.9%. Forty-four percent of all births were premature, and 62.1% of all newborns had low birth weight. The most common antenatal complications were pregnancy-induced hypertension (13.2%), gestational diabetes (5.9%), and placental abruption (4.4%). The rate of cesarean section was 44.1%.
  
  
  CONCLUSIONS
  Among patients who have severe OHSS after IVF treatment, the pregnancy rate and the rates of multiple gestation, miscarriage, prematurity, low birth weight, pregnancy-induced hypertension, gestational diabetes, and placental abruption are significantly higher than those reported previously for pregnancies conceived with the use of assisted reproductive techniques.
authors.affiliation: Department of Obstetrics and Gynecology, Hadassah Hebrew University Medical Center, Ein-Kerem, Jerusalem, Israel.
authors.forename: Y
authors.initials: Y
authors.lastname: Abramov
authors.forename: U
authors.initials: U
authors.lastname: Elchalal
authors.forename: J G
authors.initials: JG
authors.lastname: Schenker
mesh_terms: D000328:Adult; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D007557:Israel; D016471:Ovarian Hyperstimulation Syndrome; D010062:Ovulation Induction; D011247:Pregnancy; D011256:Pregnancy Outcome; D018873:Pregnancy Rate; D012189:Retrospective Studies