Perinatal morbidity after in vitro fertilization is lower with frozen embryo transfer.

Abstract:

OBJECTIVE:To study the association of perinatal outcome and IVF transfer type in a group of infertility patients with standardized treatment and similar prognosis. DESIGN:Retrospective cohort study. SETTING:University-based infertility center, January 1998 to June 2006. PATIENT(S):Two hundred eighteen IVF pregnancies after fresh embryo transfer (ET); 122 IVF pregnancies after frozen ET. INTERVENTION(S):Assessment of perinatal outcome in fresh versus frozen ET pregnancies. MAIN OUTCOME MEASURE(S):Pregnancy outcomes after fresh versus frozen embryo transfer (ET). Primary outcome was a composite of three events: preterm delivery, intrauterine growth restriction, or low birth weight. Secondary outcomes were subtypes of pregnancy loss. Associations were assessed using multivariate logistic regression. RESULT(S):The final sample included 340 pregnancies: 218 fresh and 122 frozen ETs. Singleton pregnancy was less likely after transfer of fresh embryos (odds ratio [OR] 0.39, 95% confidence interval [CI] 0.23-0.67), and pregnancies after fresh ET were more likely to end in first-trimester loss (OR 1.82, 95% CI 1.05-3.13). Composite adverse outcome after transfer of fresh (44.0%) versus frozen (32.6%) embryos was higher (OR 1.52, 95% CI 0.90-2.56) and was strongly associated with twin gestation (OR 23.82, 95% CI 11.16-50.82). CONCLUSION(S):Perinatal morbidity is higher in IVF pregnancies conceived after a fresh ET compared with a frozen ET. Although some differences are related to conception with twin gestations, these findings suggest that adverse outcomes may be related to differences in IVF procedures.

journal_name

Fertil Steril

journal_title

Fertility and sterility

authors

Kansal Kalra S,Ratcliffe SJ,Milman L,Gracia CR,Coutifaris C,Barnhart KT

doi

10.1016/j.fertnstert.2010.05.049

subject

Has Abstract

pub_date

2011-02-01 00:00:00

pages

548-53

issue

2

eissn

0015-0282

issn

1556-5653

pii

S0015-0282(10)00921-0

journal_volume

95

pub_type

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