Definition of vagal
The vagal resulting in loss of consciousness and "postural tone," that is to say, the muscle tension permanent base which allows involuntary hold its shape. Because of the vagus nerve stimulation, blood pressure drops, blood flow decreases, depriving the brain of oxygen, the pulse weakens or disappears.
Risk and consequence of vagal
After experiencing the warning signs of discomfort, the person faints. This usually only lasts a few seconds. The return to consciousness is completely and spontaneously.
The vagal has no immediate danger heart or brain. BUT fainting exposes the person to injury by sharp drop in 30-40% of cases, and public road accidents in 1-5% of cases. We understand that one edge of a cliff vagal unexpected or fatal.
Lying down is usually enough to return to home. It also occurs spontaneously as the person falls to the ground. If it is not possible, the malaise can persist and lack of oxygen be harmful brain (seizures possible at this time).
The vasovagal when it reproduces regularly affects the quality of life there is concern of taking the car, or left alone.
Finally, cardiovascular (bradycardia, coronary heart disease) are sometimes the cause of the problem. They must be diagnosed and treated.
Causes and origins of vagal
Our autonomic nervous system controls unconscious activities of the body, such as the frequency of the heart beat. It is composed of the sympathetic nervous system, which increases blood pressure and heart rate, and parasympathetic (vagal or system and vagus nerve), which has the opposite effect.
The cause of vasovagal is put into play excessive or inappropriate parasympathetic system, which slows heart activity. All organs, including the brain, then receive less oxygen and discomfort appears.
All the circumstances that stimulate the parasympathetic nervous system may cause vagal stimulation by excess: prolonged standing, warm and confined, intense pain, strong emotion, stress (sight of blood, a needle ...), meal or instead hypoglycemia, abrupt physical exertion ...
There may be a familial predisposition to hyperactivity of the parasympathetic system. Certain medications such as beta blockers or treatment of hypertension favor the occurrence of this type of discomfort.
Signs and symptoms of a vasovagal
The vagal is easily recognizable! Before fainting, warning signs are known to almost everyone: hot flushes, fatigue, blurred vision, sweating, paleness, diarrhea, hearing disorders (tinnitus). The vagus nerve also helps nausea and vomiting.
The vagal rather occurs in young patients and healthy with autonomic nervous system in good shape, and responsive. It affects pregnant women and women with painful periods, those being treated for hypertension.
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