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Chemosphere. 2019 Jul;226:597-606. doi: 10.1016/j.chemosphere.2019.03.146. Epub 2019 Mar 25.

Couples exposure to phthalates and its influence on in vitro fertilization outcomes.

Author information

1
Environmental Health Program, Research Centre, Saudi Arabia. Electronic address: iman@kfshrc.edu.sa.
2
Department of Pathology and Laboratory Medicine, Saudi Arabia.
3
Environmental Health Program, Research Centre, Saudi Arabia.
4
Reproductive Medicine Unit, Department of Obstetrics & Gynecology, King Faisal Specialist Hospital and Research Centre, PO Box: 3354, Riyadh, 11211, Saudi Arabia.

Abstract

This prospective study examined the associations between the levels of eight urinary phthalate metabolites in 599 couples and in vitro fertilization (IVF) outcomes. We used log-binomial multivariate regression to estimate relative risks (RR) for the association between phthalate concentration and IVF binary outcomes (fertilization rate >50%, biochemical pregnancy, clinical pregnancy and live birth) for each woman after adjusting the model for the concentration in a male partner and each relevant confounders. RR was expressed per unit increase in log-transformed urinary metabolite concentration. The percentage of bis-2-ethylhexyl phthalate (DEHP) metabolites excreted as mono-2-ethylhexyl phthalate (MEHP) was calculated as %MEHP. Urinary MEHP in women was associated with an increased risk of biochemical pregnancy (RR = 1.35; p = 0.04), failed clinical pregnancy (RR = 1.56; p = 0.006) and live birth (RR = 1.54; p = 0.011). An increase in monoethyl phthalate was associated with a high risk of failed clinical pregnancy (RR = 1.25; p = 0.03) and live birth (RR = 1.35; p = 0.006). An increase in %MEHP was associated with an increase in the risk of biochemical pregnancy (RR = 1.55; p = 0.05), failed clinical pregnancy (RR = 1.73; p = 0.02) and live birth (RR = 1.65; p = 0.046). Our results demonstrated that exposure to some phthalates may adversely affect IVF outcomes, particularly when couples' exposure was jointly modeled, emphasizing the importance of a couple-based approach in assessing fertility outcomes. The associations between IVF outcomes and DEHP metabolites were stronger in women whose %MEHP was >75th percentile which may be due to their less efficient metabolism and excretion of DEHP and/or MEHP.

KEYWORDS:

Biochemical pregnancy; Clinical pregnancy; Fertilization rate; IVF; Live birth; Phthalates

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