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The carotid sinus baroreceptor can be oversensitive to manual stimulation from the pressure applied at the carotid sinus at the carotid bifurcation. It is a condition known as 'carotid sinus hypersensitivity' (CSH), 'carotid sinus syndrome' or 'carotid sinus syncope', in which manual stimulation causes large changes in heart rate and blood ...
Vagal maneuvers (most commonly carotid sinus massage) are used to diagnose carotid sinus hypersensitivity. [2] Therapeutic: Vagal maneuvers are the first-line treatment of hemodynamically stable supraventricular tachycardia, serving to slow down or terminate the arrhythmia. [3]
Carotid sinus syncope is due to pressure on the carotid sinus in the neck. [2] The underlying mechanism involves the nervous system slowing the heart rate and dilating blood vessels, resulting in low blood pressure and thus not enough blood flow to the brain. [2] Diagnosis is based on the symptoms after ruling out other possible causes. [3]
Some people develop an initial "inflammatory phase" characterized by systemic illness with signs and symptoms of malaise, fever, night sweats, weight loss, joint pain, fatigue, and fainting. Fainting may result from subclavian steal syndrome or carotid sinus hypersensitivity. [5]
Neurally mediated syncope may also occur when an area in the neck known as the carotid sinus is pressed. [1] A normal response to carotid sinus massage is reduction in blood pressure and slowing of the heart rate. Especially in people with hypersensitive carotid sinus syndrome this response can cause syncope or presyncope. [9]
Carotid sinus baroreceptors are responsive to both increases or decreases in arterial pressure, while aortic arch baroreceptors are only responsive to increases in arterial pressure. [6] Arterial baroreceptors inform reflexes about arterial blood pressure but other stretch receptors in the large veins and right atrium convey information about ...
There are other subtle warning symptoms to watch out for, neurologists say. A migraine attack can be a debilitating condition. But a headache is just one part. There are other subtle warning ...
Surgical or radiologic ablation of the carotid sinus nerve is used to treat carotid sinus hypersensitivity. [14] In a vagotomy, the vagus nerve is surgically removed to treat peptic ulcer disease by reducing stomach acid. [15] In a rhizotomy, nerve fibers in the spinal cord are destroyed with the intent of eliminating chronic myalgia. [16]