Female patient experienced cardiac arrest while in a cardiac stepdown unit.A zoll aed plus was used to shock the heart.Return of spontaneous circulation was obtained.The patient was transferred to the coronary care unit.In the coronary care unit the patient went into ventricular tachycardia and ventricular fibrillation.This time the zoll aed plus would not shock the heart.The staff checked all the wires and vermed heartsync pads connections, but the zoll aed plus would not deliver a shock.The staff changed the vermed heartsync pads, however the zoll aed plus still would not shock.The staff substituted the zoll aed plus with another zoll aed plus and shocked patient.The zoll aed plus that failed had passed the quality checks done at the beginning of the shift.The zoll aed plus that failed to shock was taken out of service and biomed notified to come and pick it up for service.No untoward patient effects.
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