While preparing patient for cardiac catherization, defibrillator inadvertently delivered 35.3j, putting the patient in vfib.Defibrillator appears to have been at a low or depleted battery duration of the case.Clinical team was unaware of the lack of connection to ac power.Defibrillator appears to have turned off during the case several times.Once clinical team became aware of vfib, responded and recovered patient to normal sinus rhythm.During investigation, concerns were raised regarding appropriate low battery alarms and audible charging tones.
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