Carotid Sinus


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carotid sinus

[kə′räd·əd ′sī·nəs]
(anatomy)
An enlargement at the bifurcation of each carotid artery that is supplied with sensory nerve endings and plays a role in reflex control of blood pressure.

Carotid Sinus

 

(bulbus caroticus, sinus caroticus, the dilated area of the common carotid artery before bifurcation into its external and internal branches.

The carotid sinus is an important reflexogenic zone that plays a part in maintaining the constancy of arterial pressure, heart action, and blood gases content; it is the site of baroreceptors, which react to changes in blood pressure, and chemoreceptors, which react to changes in the chemical composition of the blood and in oxygen tension. The carotid sinus is innervated by the sensory branch of the glossopharyngeal nerve (sinus nerve, Hering’s nerve). Excitation of the nerve endings in the carotid sinus is the first link in the chain of the carotid reflexes.

I. N. D’IAKONOVA

References in periodicals archive ?
I was remembering that no matter how well I tried to teach those amazing nurses how to massage his carotid sinus, his heart responded only to my touch.
Carotid sinus massage or adenosine may terminate an antidromic AVRT.
Life threatening cervico-mediastinal haematoma after carotid sinus massage.
The occurrence of almost all episodes just after turning the head to one side, and the symptoms patient described before the falls, raised the suspicion of syncope and the diagnosis of carotid sinus syncope was confirmed by performing carotid massage.
Persistent hypotension can be caused by the effect of the stent on the carotid sinus baroreceptors (Trocciola et al.
Carotid sinus hypersensitivity [17] is more common in patients with fractured necks of femur (36%)--both cognitively impaired and cognitively normal than in patients admitted acutely for reasons other than falls (17%) or frail day-hospital attendees (13%) [18, 19].
sup][6],[8],[9] However, the instability of the systemic BP at that time and the operative stimulation of the carotid sinus interfere with the predictive power of this method.
1] Reflex syncope can be further categorised into vasovagal syncope (from emotional or orthostatic stress); situational syncope (due to specific situational stressors such as micturition, vomiting and defecation); carotid sinus syncope (from pressure on the carotid sinus, e.
Pacemakers cut the rate of fails in only the subgroup of patients who had cardioinhibitory carotid sinus hypersensitivity that induced sudden changes in heart rate and blood pressure, and they did not decrease the risk of falling in any patient group.
1) The second proposed mechanism states that the increase in carotid sinus pressure with ventricular systole causes reflex slowing of the sinus node some 200-500 ms after the peak of mechanical systole, which, of course, is well after the QRS.