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Value of the unipolar electrogram in the diagnosis of right ventricular perforation following pacemaker implantation
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A 76 year old patient with paroxysmal atrial fibrillation and recurrent syncope caused by sinus arrest was admitted for permanent pacemaker implantation. This was uncomplicated with satisfactory pacing parameters (ventricular lead: threshold 0.7 V at 0.5 ms, R wave 18.1 mV). A routine pacing check the following day revealed complete loss of …