Saturday, August 3, 2013

Stain-Resistant Chemicals Linked to High Blood Pressure During Pregnancy

By Environmental Health News
Sat, Aug 3, 2013 at 8:00 AM

Mothers’ exposure to chemicals that make consumer products stain- and water-resistant has been linked to high blood pressure during pregnancy in an analysis of highly exposed communities in West Virginia and Ohio. The mothers’ levels of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) levels were associated with an increase in the odds of them experiencing pregnancy-induced hypertension.

Hypertension during pregnancy can be life-threatening for the mother and child. It can prevent the fetus from receiving enough blood, triggering low birth weight. The placenta can also erupt, resulting in serious bleeding in the mother. Seizures, temporary kidney failure, liver, and blood clotting problems are also common in the mother.

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For the study, PFOS and PFOA were measured in the blood of 1,330 pregnant women who live in the mid¬ Ohio Valley, near the DuPont Company’s Washington Works factory in West Virginia. The plant has used PFOA in the manufacture of fluoropolymers since 1951, with use peaking in the 1990s.

The drinking water in communities downstream of the plant contains high levels of PFOA. Adults there have approximately twenty times higher PFOA levels in their blood compared to the general US population. The new study is part of a large project, funded by a settlement of a class-action lawsuit against DuPont, to examine human health effects from perfluorinated chemicals.

The women in the study all gave birth between 2005 and 2010; 106 of them, or 6.5 percent, had pregnancy-induced hypertension. Per every log unit increase of PFOS, the women’s odds of hypertension increased 47 percent, and for PFOA, 27 percent.

The study found no connection between the chemicals and incidence of premature births or low birth-weight babies. The study, however, did find a modest, although “not statistically significant” reduction in the weight of full-term newborns associated with increasing PFOS. Previous research in other populations has linked PFOS exposure in the womb to babies born sooner and smaller than babies with lower exposure. The new finding is compatible with the magnitude of associations reported in these other studies, wrote the study's authors.

PFOS and PFOA are synthetic, environmentally persistent chemicals used as water and grease repellents. PFOS, produced by 3M and used in Scotchgard, was phased out in 2001, but remains the predominant PFC in the environment. PFOA is used in Teflon, but is also being phased out.

PFOA exposure has been linked to a number of health effects, including thyroid disease, high cholesterol, early signs of liver damage, testicular and kidney cancer, and pregnancy-induced hypertension and preeclampsia. PFOS exposure has been linked to reduced fertility in men and women, reduced vaccine effectiveness, disrupted thyroid hormones and ADHD symptoms in children.

A version of this report was originally published by EnvrionmentalHealthNews.org

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