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Published in: Orphanet Journal of Rare Diseases 1/2014

Open Access 01-12-2014 | Research

Assessing the role of multiple pregnancies in the association between tetralogy of Fallot and assisted reproductive techniques: a path-analysis approach

Authors: Karim Tararbit, Nathalie Lelong, Lucile Houyel, Damien Bonnet, François Goffinet, Babak Khoshnood

Published in: Orphanet Journal of Rare Diseases | Issue 1/2014

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Abstract

Background

Assisted reproductive techniques (ART) are associated with a higher risk of tetralogy of Fallot (TOF) and multiple pregnancies may be associated with a higher risk of congenital anomalies. We assessed the extent to which the association between ART and risk of TOF may be mediated by the higher risk of multiple pregnancies associated with ART.

Methods

We conducted a case–control study using population-based data from the Paris Registry of Congenital Malformations for the period 1987–2009 and a cohort study of congenital heart defects (EPICARD). The study population included 395 cases of TOF and 4104 malformed controls with no known associations with ART. The analysis was based on a path-analysis model using a counterfactual approach, which allows decomposition of the total effect of ART into an indirect effect (that mediated by the association between ART and multiple pregnancies) and a direct effect.

Results

ART (all methods combined) were associated with a 2.6-fold higher odds of TOF after adjustment for maternal and paternal characteristics and year of birth (adjusted OR 2.6, 95% CI, 1.5-4.5). Most (79%) of the effect associated with ART was a direct effect (i.e., not mediated by multiple pregnancies), whereas 21% of the effect of ART was due to its association with multiple pregnancies (i.e., the indirect effect). In vitro fertilization with intracytoplasmic sperm injection was associated with a 3.5-fold higher odds of TOF (adjusted OR 3.5, 95% CI, 1.1-11.2); 11% of this effect was mediated through the association of ICSI with multiple pregnancies.

Conclusions

By far, most of the higher risk of TOF associated with ART is a direct effect and only a small proportion of the effect may be mediated by multiple pregnancies.
Appendix
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Metadata
Title
Assessing the role of multiple pregnancies in the association between tetralogy of Fallot and assisted reproductive techniques: a path-analysis approach
Authors
Karim Tararbit
Nathalie Lelong
Lucile Houyel
Damien Bonnet
François Goffinet
Babak Khoshnood
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Orphanet Journal of Rare Diseases / Issue 1/2014
Electronic ISSN: 1750-1172
DOI
https://doi.org/10.1186/1750-1172-9-27

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