Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Greater seizure frequency seen in women with epilepsy during anovulatory cycle

14.07.2011
Possible role for reproductive steroids in occurrence of tonic-clonic seizures

A recent multi-center study determined that women with generalized tonic-clonic seizures (GTCS) had a greater number of seizures during anovulatory cycles—menstrual cycles where an egg is not released—than 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 Study—a 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 frequency did not differ significantly for CPS, SPS, or for all seizures combined.

"Our results showed that GTCS frequency during anovulatory cycles correlate with proportional increases in estradiol-progesterone level ratios, suggesting sex hormones contribute to seizure incidence," concluded Dr. Herzog. "Efficacy results from the phase 3 clinical trial of a progesterone supplement that generated the data for the current study are forthcoming, and may provide a much needed treatment option to control seizures in women with epilepsy."

According to the National Institute of Neurological Disorders and Stroke (NINDS), tonic-clonic seizures, formerly known as grand mal seizures, are the most common type of generalized seizure and cause symptoms that include stiffening of the body, repeated jerking of the arms or legs, and loss of consciousness. The Epilepsy Foundation estimates that 200,000 new cases of epilepsy are diagnosed each year in the U.S., and roughly half of those are generalized onset seizures.

This study is published in Epilepsia. Media wishing to receive a PDF of this article may contact healthnews@wiley.com.

Full citation: "Variation of Seizure Frequency with Ovulatory Status of Menstrual Cycles." Andrew G. Herzog, Kristen M. Fowler, Michael R. Sperling, Joyce D. Liporace, Laura A. Kalayjian, Christianne N. Heck, Gregory L. Krauss, Barbara A. Dworetzky, Page B. Pennell, and the Progesterone Trial Study Group Epilepsia; Published Online: July 14, 2011 (DOI: 10.1111/j.1528-1167.2011.03194.x). http://doi.wiley.com/10.1111/j.1528-1167.2011.03194.x.

Epilepsia is the leading, most authoritative source for current clinical and research results on all aspects of epilepsy. As the journal of the International League Against Epilepsy, subscribers every month will review scientific evidence and clinical methodology in: clinical neurology, neurophysiology, molecular biology, neuroimaging, neurochemistry, neurosurgery, pharmacology, neuroepidemiology, and therapeutic trials. For more information, please visit http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1528-1167.

Wiley-Blackwell is the international scientific, technical, medical, and scholarly publishing business of John Wiley & Sons, with strengths in every major academic and professional field and partnerships with many of the world's leading societies. Wiley-Blackwell publishes nearly 1,500 peer-reviewed journals and 1,500+ new books annually in print and online, as well as databases, major reference works and laboratory protocols. For more information, please visit www.wileyblackwell.com or our new online platform, Wiley Online Library (wileyonlinelibrary.com), one of the world's most extensive multidisciplinary collections of online resources, covering life, health, social and physical sciences, and humanities.

Dawn Peters | EurekAlert!
Further information:
http://www.wiley.com

More articles from Studies and Analyses:

nachricht Real-time feedback helps save energy and water
08.02.2017 | Otto-Friedrich-Universität Bamberg

nachricht The Great Unknown: Risk-Taking Behavior in Adolescents
19.01.2017 | Max-Planck-Institut für Bildungsforschung

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Stingless bees have their nests protected by soldiers

24.02.2017 | Life Sciences

New risk factors for anxiety disorders

24.02.2017 | Life Sciences

MWC 2017: 5G Capital Berlin

24.02.2017 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>