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Greater seizure frequency seen in women with epilepsy during anovulatory cycle
Date:7/13/2011

A recent multi-center study determined that women with generalized tonic-clonic seizures (GTCS) had a greater number of seizures during anovulatory cyclesmenstrual cycles where an egg is not releasedthan in cycles where ovulation occurs. According to the study publishing today in Epilepsia, a journal of the International League Against Epilepsy (ILAE), reproductive steroids may play a role in GTCS occurrence.

Medical evidence has shown that sex hormones, estradiol and progesterone, have neuroactive properties that can affect seizures. Previous studies by Andrew Herzog, MD, MSc, of Beth Israel Deaconess Medical Center in Boston, Massachusetts and colleagues found that ratios of hormone levels in the blood differ in relation to the ovulatory status of menstrual cycles, with anovulatory cycles having higher estradiol-progesterone ratios during the second half of the menstrual cycle (luteal phase) compared to ovulatory cycles. Further studies have determined that anovulatory cycles are more common among women with epilepsy than in the general population.

To expand on their prior research, Dr. Herzog and colleagues used data collected during the Progesterone Trial Studya 3-month investigation of progesterone therapy for focal onset seizures that are difficult to control. Of the 281 women who participated, 92 had both anovulatory and ovulatory cycles during the study period, with progesterone levels of 5 ng/ml measured in the latter part of the menstrual cycle, designating ovulation.

Among the 281 study participants, 37% had GTCS, 81% had complex partial seizures (CPS) and 38% had simple partial seizures (SPS). In the 92 women who had both ovulatory and anovulatory cycles, the seizure percentages were slightly lower, but not significantly different. Researchers determined that the average daily seizure frequency was 30% greater in the women during their anovulatory cycles than in those cycles were ovulation occurred. Seizure freque
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Contact: Dawn Peters
healthnews@wiley.com
781-388-8408
Wiley-Blackwell
Source:Eurekalert

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