Abstract
Carotid sinus syndrome has been reported recently to be associated with chronic denervation of the sternocleidomastoid muscles. To further understand the relationship between carotid mechanoreceptors and sternocleidomastoid denervation, the present study investigated the relation between the results of carotid sinus massage and electromyographic activity of the sternocleidomastoid muscles in patients without syncope. Patients were selected prospectively if they fulfilled strict exclusion criteria, particularly the absence of a history of syncope, pacemaker implantation, or drugs known to modify the behavior of the autonomic nervous system. A right and left carotid massage was performed for 10 seconds in 30 patients (22 men; mean age, 67.3 +/- 6.5 years). The results (monitoring for heart rate and blood pressure) were classified as normal, doubtful, or hypersensitive carotid sinus. Sternocleidomastoid electromyography activity was recorded from the right and left sides, and the results were classified as normal, moderate denervation, and severe denervation. Carotid sinus massage was normal in 13 patients (43%), doubtful in 9 (30%), and abnormal in 8 (27%). Electromyographic activity of the sternocleidomastoids was normal in 13 p...Continue Reading
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