Sunday, October 19, 2008

"Fainting"

from the merck manual.

Fainting (syncope) is a sudden, brief loss of consciousness. ....

Causes - A person cannot lose consciousness unless there is a general disturbance of brain function. This disturbance usually involves a reduction in blood flow to the brain. ....

Vagus Nerve Stimulation: Fainting may occur if the vagus nerve, which supplies the neck, chest, and intestine, is stimulated. When stimulated, the vagus nerve slows the heart. Such stimulation also causes nausea and cool, clammy skin. This type of fainting is called vasovagal (vasomotor) syncope. The vagus nerve is stimulated by pain, fear, other distress (such as that due to the sight of blood), vomiting, a large bowel movement, and urination. ....

Vasovagal syncope may occur when a person is sitting or standing. It is often preceded by nausea, weakness, yawning, blurring of vision, and sweating. The skin may become cool and clammy. The person becomes ghostly pale, the pulse becomes very slow, and the person faints. ....

If the fainting occurs during emotionally stressful situations or is preceded by symptoms of vasovagal syncope (such as nausea, sweating, cool and clammy skin, and paleness), fainting usually is not serious, and extensive diagnostic procedures and treatment are rarely necessary. ....

but i'll tell ya, it sure ain't comfortable. the prospect of whacking my head on the floor or falling down the stairs doesn't appeal either.
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1 comment:

  1. Darci3:43 a.m.

    the one time I did faint, at least the time I can remember.. I blacked out before I hit the ground. Woke up in the mud, having been thrown off of a horse. I was sore for a while after.. I agree. Not fun.

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