Vasovagal response

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vasovagal response - vasodilatation and the slowing down of heart rate, leading to a drop in blood pressure, results from a change in body position, usually in the vertical position.

Physiology

It is a physiological reaction that is usually felt as a dizzy spasm with the displacement of approximately 700 ml of blood into the venous system below the diaphragm. This results in a decrease in venous return, leading to a reduction in cardiac output. Reduction of cardiac output triggers compensatory mechanisms, which involve the contraction of the visceral blood vessels and the skin and accelerates the heart rate. These two mechanisms usually prevent unconsciousness, and baroreceptors located in the aortic arch and carotid sinus are located to guard the correctness of this reaction. pathology

Under pathological conditions, the baroreceptor reflex is abnormal: bradycardia and vasodilatation result in fainting of the vagus, leading to syncope, called vasopressive syncope. Diagnostics

In the diagnosis of vasovagal syncope, a tilt test is used. Treatment

Pharmacological treatment:

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