Fainting May Run in the Family
A common kind of fainting appears to run in families, a
new study of twins shows.
About 1 in 4 people will faint at some point in their
lives. Fainting is a sudden, brief loss of consciousness after blood pressure
drops to the brain. Sometimes, that loss of blood pressure happens for internal
reasons -- dehydration or heart problems, for example.
But puzzlingly, people sometimes black out in response to
some kind of outside-the-body trigger, like the sight of blood or after some
kind of emotional upset. This is called vasovagal syncope.
Fortunately, fainting isn't usually dangerous. Most
people usually wake up a few seconds after they pass out, but they may fall in
the process. Falling during a fainting spell, however, can lead to injuries.
The study, which is published in the journal Neurology,
suggests that in some cases, fainting may be inherited. If researchers can
identify the genes involved, they say it may point to a way to help the small
percentage of people who pass out so regularly that it interferes with their
lives.
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