Abstract
Parasympathetic system activation is generally known as the origin of vasovagal syncope. As a matter of fact, the sympathetic system activation is the major trigger of vasovagal syncope. The association of hyperventilation or hyperexcitability neuromuscular syndrome can also play an important role as a trigger. A good knowledge of these mechanisms may help to prevent and treat the vasovagal syncope at its early stage. The treatment of vagal reaction relies on: supine position, contractions of the muscles of the lower limbs for about ten minutes, reduction of the ventilation rate.
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