In two cases of hyperactive carotid sinus with syncope, both patients had a history of syncopal attacks. Carotid sinus massage produced asystole lasting for four seconds with recurrent symptoms. Permanent demand pacemakers were implanted in both patients, causing a relief of symptoms.
(JAMA 237:2320-2321, 1977)
Chughtai AL, Yans J, Kwatra M. Carotid Sinus SyncopeReport of Two Cases. JAMA. 1977;237(21):2320–2321. doi:10.1001/jama.1977.03270480060022
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