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Published in: Journal of Assisted Reproduction and Genetics 1/2016

01-01-2016 | Assisted Reproduction Technologies

Independent factors influencing large-for-gestation birth weight in singletons born after in vitro fertilization

Authors: Sara Korosec, Helena Ban Frangez, Lili Steblovnik, Ivan Verdenik, Eda Vrtacnik Bokal

Published in: Journal of Assisted Reproduction and Genetics | Issue 1/2016

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Abstract

Purpose

Higher risk for birth of singletons being large for gestational age (LGA) has been revealed after in vitro fertilization (IVF) frozen–thawed embryo-transfer (FET). This phenomenon is now being investigated, since there is a speculation that these neonates could suffer from underlying epigenetic disturbances. The aim of the study was to expose independent LGA risk factors and to identify those connected to the IVF techniques.

Methods

Altogether, 4508 singleton pregnancies and births were included in the cohort case-matched study. Two hundred eleven singleton pregnancies and births after FET and 916 after fresh embryo transfer (ET) were included into two study groups. The IVF procedures were performed at the University Medical Centre Ljubljana between 2004 and 2011. For each IVF pregnancy, three matched consecutive controls after natural conception were included. Using logistic regression models, we observed LGA connection to maternal parameters (smoking, hypertension, parity, BMI, gestational diabetes, IVF conception, FET, double ET, and ICSI procedure).

Results

Singletons born after FET had a significantly higher risk for being LGA (p = 0.032; OR 1.697; 95 % CI 1.047–2.752). BMI 25–30 was a significant independent risk factor for LGA in the IVF groups (FET p = 0.041, OR 2.460, 95 % CI 1.030–5.857 and fresh ET p = 0.003; OR 2.188, 95 % CI 1.297–3.691). ICSI and double ET had no significant effect on LGA occurrence.

Conclusions

Besides maternal BMI, FET is a significant independent LGA risk factor in IVF patients. Other observed factors (smoking, hypertension, multiparity, GDM, ICSI procedure, or number of embryos transferred) do not influence LGA risk significantly.
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Metadata
Title
Independent factors influencing large-for-gestation birth weight in singletons born after in vitro fertilization
Authors
Sara Korosec
Helena Ban Frangez
Lili Steblovnik
Ivan Verdenik
Eda Vrtacnik Bokal
Publication date
01-01-2016
Publisher
Springer US
Published in
Journal of Assisted Reproduction and Genetics / Issue 1/2016
Print ISSN: 1058-0468
Electronic ISSN: 1573-7330
DOI
https://doi.org/10.1007/s10815-015-0601-4

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