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Research article2007Peer reviewedOpen access

Less syncope and milder symptoms in patients treated with pacing for induced cardioinhibitory carotid sinus syndrome: a randomized study

Claesson JE, Kristensson BE, Edvardsson N, Wahrborg P


Aims The aim of this study was to examine the effect on symptoms in patients with induced cardio-inhibitory carotid sinus syndrome (ICSS) when treated or not treated with a pacemaker. Methods and results Sixty patients with a history of syncope or pre-syncope and ICSS were randomized to receive a permanent pacemaker (P group, n = 30) or no pacing (NP group, n = 30). ICSS was defined as a ventricular pause (i.e. asystole) Lasting 3 s or more in response to carotid sinus stimulation. The patients were seen at 3 and 12 months and at symptoms. At 12 months, the rate of syncope in the NP group was 40% (n = 12) compared with 10% (n = 3) in the P group (P = 0.008). The majority (11 of 12) of the syncope recurrences in the NP group occurred during the first 3 months. Pre-syncope occurred in two patients (7%) in the NP group and in eight (27%) in the P group. Ten patients (33%) with recurrent syncope in the NP group later crossed-over to receive pacemaker implant. Conclusions A history of syncope or pre-syncope, plus ICSS, was a strong predictor of subsequent syncope or pre-syncope. Most of the new symptoms occurred within 3 months. Pacemaker treatment effectively reduced syncope and/or resulted in milder symptoms

Published in

2007, Volume: 9, number: 10, pages: 932-936

    UKÄ Subject classification

    Social Sciences
    Economics and Business

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