Vasovagal response
Vasovagal response (pronounced: vay-zo-VAY-gul) is a physiological reaction mediated by the Vagus nerve, one of the primary nerves of the Autonomic nervous system.
Etymology
The term "vasovagal" is derived from "vaso", pertaining to blood vessels, and "vagal", relating to the vagus nerve.
Definition
The vasovagal response is a common cause of fainting, also known as syncope. It occurs when the body overreacts to certain triggers, such as the sight of blood or extreme emotional distress. The sudden drop in heart rate and blood pressure leads to a reduced blood flow to the brain, which can cause a brief loss of consciousness.
Symptoms
Symptoms of a vasovagal response can include lightheadedness, nausea, the feeling of being hot or cold (accompanied by sweating), ringing in the ears (Tinnitus), and visual disturbances such as lights seeming too bright, fuzzy or tunnel vision, and sometimes fainting.
Triggers
Common triggers for a vasovagal response include prolonged standing, heat exposure, the sight of blood, having blood drawn, fear of bodily injury, straining, such as to have a bowel movement, sudden onset of extreme emotions, or the consumption of alcohol or drugs.
Treatment
Treatment for vasovagal response typically involves lying down or sitting and putting the head between the knees if feeling faint. In some cases, medical treatment may be necessary, especially if the episodes of syncope are frequent or severe.
Related Terms
External links
- Medical encyclopedia article on Vasovagal response
- Wikipedia's article - Vasovagal response
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