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Morbid obesity and pregnancy outcomes after single blastocyst transfer: a retrospective, North American study

  • Assisted Reproduction Technologies
  • Published:
Journal of Assisted Reproduction and Genetics Aims and scope Submit manuscript

Abstract

Purpose

Maternal obesity has been shown to affect reproductive function and pregnancy outcomes following in vitro fertilization. More recently, studies have demonstrated lower live birth rates after single blastocyst transfer (SBT) in patients who are overweight or obese. However, the impact of morbid obesity on pregnancy outcomes after SBT has not been well elucidated. The present study aimed to determine whether morbid obesity has a detrimental impact on pregnancy outcomes after SBT in a North American population.

Methods

A retrospective, cohort study including 520 nulliparous and multiparous women undergoing top-quality SBT between August 2010 and March 2014 at a University Health Centre in North America was conducted. Primary outcomes included: miscarriage rate, clinical pregnancy rate, and live birth rate. Subjects were divided into different BMI categories (kg/m2), including <20, 20–24.9, 25.0–29.9, 30–40, and 40 or more.

Results

The miscarriage rate per pregnancy for each group, respectively, was 36, 64, 59, 61, and 50% (p = 0.16); the clinical pregnancy (per patient) rate per group was 36, 52, 38, 26, and 10% (p = 0.009); and the live birth rate (per patient) per group was 35, 50, 38, 26 and 10% (p = 0.03).

Conclusion

Morbid obesity is a strong and independent predictor of poor pregnancy outcomes in patients undergoing top-quality SBT.

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Abbreviations

SBT:

Single blastocyst transfer

PR:

Pregnancy rate

CPR:

Clinical pregnancy rate

LBR:

Live birth rate

PCOM:

Polycystic ovarian morphology

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Contributions

MR: Participated in data extraction and manuscript drafting and revision

TS: Participated in the revision of the manuscript

SA: Participated in the revision of the manuscript

MD: Participated in the data extraction and manuscript drafting and revision

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Authors and Affiliations

  1. Department of Obstetrics and Gynaecology, The Ottawa Hospital, University of Ottawa, 501 Smyth Rd, Ottawa, ON, Canada, K1H 8L6

    Miguel Russo

  2. Division of Reproductive Endocrinology and Infertility, McGill University, MUHC Reproductive Centre, 687 Avenue des Pins #58, Montreal, QC, Canada, H3A 1A1

    Senem Ates, Talya Shaulov & Michael H. Dahan

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  1. Miguel Russo
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  2. Senem Ates
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  3. Talya Shaulov
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Correspondence to Miguel Russo.

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Russo, M., Ates, S., Shaulov, T. et al. Morbid obesity and pregnancy outcomes after single blastocyst transfer: a retrospective, North American study. J Assist Reprod Genet 34, 451–457 (2017). https://doi.org/10.1007/s10815-017-0883-9

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  • DOI: https://doi.org/10.1007/s10815-017-0883-9

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