Clinicians should be aware that pacemaker malfunction following D.C. countershock may be delayed rather than immediate.
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Delayed pacemaker malfunction after DC shock warrants vigilance; this case leaves open the incidence and mechanisms.
Immediate pacemaker malfunction following defibrillation or cardioversion has been reported. In this paper we report one patient whose pacemaker appeared to be functioning normally after D. C. countershock but malfunctioned 13 days later manifested by changing from an R-wave inhibited to an R-wave synchronous mode.
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Palac et al. (1981) studied this question.
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