Vasovagal syncope: A sudden drop in blood pressure and heart rate leads to lightheadedness and passing out. Vasovagal refers to the vagus nerve's effects upon the vascular system. Among reasons for passing out, vasovagal syncope is one of the most common. When someone faints to the sight of blood, or overwhelmed with emotion, it is often due to vasovagal syncope.
Answered 4/19/2013
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