A patient with the bradycardia-tachycardia syndrome received a permanent ventricular inhibited demand pacemaker as well as a standby temporary transvenous pacemaker. When ventricular premature beats were seen, the temporary pacemaker was activated at 135 beats/min. Sinus bradycardia was now seen due to the inhibition of the permanent pacemaker by the pacing stimuli of the non-capturing temporary pacemaker.
