Signs of syncope

Premonition syncope is a more common vascular syncope in young people.It refers to various stimuli that mediate reflexes through the vagus nerve, leading to dilatation of visceral and muscle small blood vessels and bradycardia, sudden expansion of peripheral blood vessels, reduction of venous blood return to the heart, and acceleration of the heart. And strengthen the reflex action of contraction, some people will suddenly stimulate the vagus nerve and parasympathetic nerves, which will cause the heartbeat to suddenly slow down and peripheral blood vessels to expand, resulting in lower blood pressure, hypoxia in the brain, and arterial hypotension accompanied by a brief consciousness A syndrome in which it is lost and can recover on its own without signs of neurolocalization.