title: A comparison of the miscarriage rate between women with and without polycystic ovarian syndrome undergoing IVF treatment.
abstract: OBJECTIVE
  To investigate if patients with polycystic ovary syndrome (PCOS) who conceived via IVF treatment had a higher miscarriage rate than non-PCOS subjects after controlling for several important confounding variables relating to pregnancy loss.
  
  
  METHODS
  A retrospective, observational, cohort study including a consecutive series of 564 embryo transfer cycles from PCOS patients and 7494 embryo transfer cycles from non-PCOS patients. Only the first pregnancy arising from IVF treatment was included for subsequent analysis. None of the subjects underwent ovarian diathermy or drilling prior to IVF treatment. Low dose (≤1000mg daily), short term (≤3 weeks) metformin therapy was used in 50 of the 301 PCOS subjects included in the study.
  
  
  RESULTS
  After controlling for the number of embryo transferred, the type of embryos transferred (fresh or frozen-thawed), and the stage of embryo development at the time of transfer, women with PCOS had a consistently higher biochemical pregnancy rate than women without PCOS (fresh single day 3 embryo transfer, 46.7% (7/15) vs. 14.5% (27/186), respectively, p<0.05; frozen-thawed single day 3 embryo transfer, 25.9% (7/27) vs. 6.1% (11/181), p<0.05; fresh double day 3 embryo transfer, 17.1% (12/70) vs. 7.6% (95/1256), p<0.05; frozen-thawed double day 3 embryo transfer, 7.9% (15/189) vs. 3.4% (66/1968), p<0.05). There was no significant difference in the clinical miscarriage rate between the two groups of subjects.
  
  
  CONCLUSIONS
  PCOS patients who conceived following IVF treatment had higher biochemical loss than women without PCOS, but the clinical miscarriage rate was no different between the two groups.
authors.affiliation: Center of Reproductive Medicine, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, PR China; Department of Obstetric & Gynecology, Prince of Wales Hospital, The Chinese University of Hong Kong. Electronic address: llhhyhqy@163.com.
authors.forename: Liu
authors.initials: L
authors.lastname: Liu
authors.affiliation: Center of Reproductive Medicine, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, PR China. Electronic address: tongshalmy@163.com.
authors.forename: Xiaomei
authors.initials: X
authors.lastname: Tong
authors.affiliation: Center of Reproductive Medicine, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, PR China. Electronic address: oliveleaf@sina.com.
authors.forename: Lingying
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Department of Obstetric & Gynecology, Prince of Wales Hospital, The Chinese University of Hong Kong; Center of Reproductive Medicine, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, PR China. Electronic address: tinchiu.li@gmail.com.
authors.forename: T C
authors.initials: TC
authors.lastname: Li
authors.affiliation: Center of Reproductive Medicine, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, PR China. Electronic address: zhoufeng.1102@163.com.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhou
authors.affiliation: Center of Reproductive Medicine, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, PR China. Electronic address: zhangsongying@126.com.
authors.forename: Songying
authors.initials: S
authors.lastname: Zhang
mesh_terms: D000022:Abortion, Spontaneous / Q000453:epidemiology* / Q000209:etiology; D000328:Adult; D002681:China / Q000453:epidemiology; D018997:Chorionic Gonadotropin, beta Subunit, Human / Q000097:blood; D015331:Cohort Studies; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro / Q000379:methods*; D006801:Humans; D011085:Polycystic Ovary Syndrome / Q000628:therapy*; D011247:Pregnancy; D012189:Retrospective Studies
chemical_list: D018997:Chorionic Gonadotropin, beta Subunit, Human
keywords: Embryo transfer; IVF; Miscarriage rate; PCOS