The effect of electrical stimulation of the vagus nerve on blood pressure
Dec 01, 2022
Source: Cainiu Health
Dr. Tian Hongbo
Introduction
Electrical stimulation of the vagus nerve leads to a decrease in blood pressure. The vagus nerve exerts an inhibitory effect on the cardiovascular system, whereas the sympathetic nerve produces an excitatory effect. Excessive activation of the sympathetic nerve can result in increased heart rate and elevated blood pressure. Stimulation of the vagus nerve can inhibit the sympathetic nerve, reducing the release of neurotransmitters, thereby lowering blood pressure and slowing heart rate.
Electrical stimulation of the vagus nerve can lead to a decrease in blood pressure.
The vagus nerve is a cranial nerve and the tenth pair of cranial nerves in the human body. It contains four types of nerve fibers: somatic sensory fibers, visceral sensory fibers, somatic motor fibers, and visceral motor fibers. As part of the parasympathetic nervous system, it antagonistically regulates physiological activities such as heart rate, respiration, and glandular secretion with the sympathetic nervous system.
Under normal conditions, human blood pressure remains relatively stable through a balance between the vagus nerve and the sympathetic nervous system. The vagus nerve exerts an inhibitory effect on the cardiovascular system, whereas the sympathetic nervous system has an excitatory effect. Excessive activation of the sympathetic nervous system increases heart rate and causes contraction of vascular smooth muscles, resulting in elevated blood pressure. When the vagus nerve is stimulated, it can inhibit the sympathetic nervous system, reducing neurotransmitter release, thereby lowering blood pressure and slowing heart rate.
In daily life, deep breathing or breath-holding may activate the vagus nerve, leading to decreased blood pressure and vasodilation. The micturition reflex may also stimulate the vagus nerve, potentially causing hypotension and fainting.
