HealthDay operates under the strictest editorial standards. Our syndicated news content is completely independent of any financial interests, is based solely on industry-respected sources and the latest scientific research, and is carefully fact-checked by a team of industry experts to ensure accuracy.
- All articles are edited and checked for factual accuracy by our Editorial Team prior to being published.
- Unless otherwise noted, all articles focusing on new research are based on studies published in peer-reviewed journals or issued from independent and respected medical associations, academic groups and governmental organizations.
- Each article includes a link or reference to the original source.
- Any known potential conflicts of interest associated with a study or source are made clear to the reader.
Please see our Editorial and Fact-Checking Policy for more detail.Editorial and Fact-Checking Policy
HealthDay Editorial Commitment
HeathDay is committed to maintaining the highest possible levels of impartial editorial standards in the content that we present on our website. All of our articles are chosen independent of any financial interests. Editors and writers make all efforts to clarify any financial ties behind the studies on which we report.
WEDNESDAY, Aug. 8, 2012 (HealthDay News) -- Fainting, or a brief loss of consciousness when the body reacts to certain triggers, is largely caused by genetic factors, according to a new study.
Researchers from Australia noted that the phenomenon, also known as vasovagal syncope, is likely not inherited through a single gene.
"Our results suggest that while fainting appears to have a strong genetic component, there may be multiple genes and multiple environmental factors that influence the phenomenon," study author Dr. Samuel Berkovic, from the University of Melbourne, explained in a news release from the American Academy of Neurology.
In conducting the study, the researchers questioned 51 sets of same-sex twins ranging in age from 9 to 69 years. At least one of the twins in each set had a history of fainting. Of the twins surveyed, 57 percent had typical fainting triggers, such as emotional distress or the sight of blood.
The study found identical twins (twins from the same fertilized egg) were almost twice as likely to both faint, compared to fraternal twins (twins from two different fertilized eggs). Fainting associated with typical triggers and unrelated to external factors, such as dehydration, was also significantly higher among the identical twins.
The findings suggested, however, fainting is not usually inherited through one gene because the frequency of fainting among non-twin relatives was low.
The study findings are published in the Aug. 7 issue of the journal Neurology.
The American Academy of Family Physicians has more about fainting.
This story may be outdated. We suggest some alternatives.
The content contained in this article is over two years old. As such our recommendation is that you reference the articles below for the latest updates on this topic. This article has been left on our site as a matter of historic record. Please contact us at firstname.lastname@example.org with any questions.