It was reported that the patient implanted with this implantable cardioverter defibrillator (icd) underwent an ablation procedure.It was reported that for the procedure, the device was programmed to voo 40 electrocautery mode.The patient was completely pacemaker dependent and during the ablation asystole was observed.The physician believed the device malfunctioned, causing the pacing to be inhibited.Technical services reviewed the available device data and discussed the defib detect circuit, a protective mechanism designed to prevent external energy/current from being delivered to an unintended location in the heart or into the device to avoid damage to the device circuitry.The defib detect circuit causes the device to truncate any pacing that is occurring at the moment and for 160 milliseconds, until the excessive energy ends.Available information indicated the patient remained hospitalized following the ablation procedure, due to the inhibited pacing.However, the field representative later confirmed that the patient's hospitalization had been a planned part of the ablation procedure and that there were only brief periods of asystole during the procedure.No adverse patient effects occurred and the device remains implanted and in service.
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