Hum. Reprod. Advance Access published online on March 31, 2008
Human Reproduction, doi:10.1093/humrep/den045
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Risk factors associated with pregnancies containing a monochorionic pair following assisted reproductive technologies
1 Department of Obstetrics Gynecology, and Reproductive Biology, Brigham and Women's Hospital and Harvard Medical School, 75 Francis Street, ASB 1+3, Rm 082, Boston, 02115 MA, USA 2 Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, 02115 MA, USA 3 Department of Epidemiology, Harvard School of Public Health, Boston, 02115 MA, USA 4 Department of Radiology, Brigham and Women's Hospital and Harvard Medical School, Boston, 02115 MA, USA
5 Correspondence address. Tel: +1-617-732-5455; Fax: +1-617-975-0825; E-mail: cracowsky{at}partners.org
BACKGROUND: Although several factors have been identified to predispose to an increased incidence of monozygotic twinning in assisted reproductive technologies (ART), the relative risks associated with each have yet to be fully established. Moreover, the focus has been predominantly on monozygosity, which, in the absence of monochorionicity, does not increase perinatal risk. The present objective was to undertake an analysis of the relative risks of factors associated with monochorionic pairs resulting from ART.
METHODS: Study cycles included the last cycle, of each patient undergoing ART at Brigham and Women's Hospital from January 1998 to December 2004, that resulted either in a pregnancy with a monochorionic pair (n = 41) or a pregnancy without a monochorionic pair at 12 weeks (n = 2460). We used multivariable logistic regression to estimate odds ratios (OR) and 95% confidence intervals (CI) to identify factors significantly associated with a monochorionic pair.
RESULTS: Independent predictors of a monochorionic pair were assisted hatching (OR 2.23, 95% CI 1.06–4.67), ICSI (OR 2.42, 95% CI 1.22–4.83) and Day 5 embryo transfer (OR 2.48, 95% CI 1.62–3.80). The effects of ICSI and Day 5 transfer were amplified when cycles involved both interventions.
CONCLUSIONS: ICSI and Day 5 embryo transfer synergistically increase the risk of monochorionic placentation. Patients undergoing these procedures should be counselled regarding these increased risks.
Key words: monochorionic placentation/monozygotic pregnancies/assisted hatching/ICSI/IVF
Submitted on August 30, 2007; resubmitted on January 16, 2008; accepted on January 30, 2008.
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  K I Aston, C M Peterson, and D T Carrell Monozygotic twinning associated with assisted reproductive technologies: a review Reproduction, October 1, 2008; 136(4): 377 - 386. [Abstract] [Full Text] [PDF]
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