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Women Beware: Plastic Bottles and Cans Could Cause Abnormal Heart Rhythms
Animal studies in the past have shown that bisphenol A (BPA) can have harmful effects on the reproductive, nervous, and immune systems.
In fact, last year, a study in humans found an increased prevalence of cardiovascular disease in people with high levels of BPA in the urine.
However, study co-author Dr. Scott Belcher at the University of Cincinnati said that the effects of BPA on the heart are unknown.
In the current study, led by Dr. Hong-Sheng Wang, the researchers found that low-dose BPA and oestrogen can act alone or in combination to increase harmful arrhythmias in female rats and mice.
As BPA has properties similar to the main female hormone oestrogen, it is considered an "environmental oestrogen."
Belcher said that mice and rats in the study had normal heart rhythms at baseline, before administration of BPA or estrogen (estradiol).
The researchers studied heart rhythms in both the working heart and in cultured heart muscle cells.
In both models, it was found that the exposure to BPA increased the frequency of arrhythmias, compared to baseline, in females but not in male animals.
Administration of oestrogen alone also increased the frequency of arrhythmias in females.
Arrhythmias were most frequent in the female rats and mice when they received both BPA and oestrogen, at levels normally found in female humans.
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