Patient coding for prolonged time.Zoll monitor had been working as expected.Patient had been shocked multiple times prior to malfunction.During the code a nurse went to shock the patient and it charged like normal but would not fire.It put up an error code saying to hold the shock button to defib, however, holding it didn't work.It was backed out, recharged and tried again with the same result.After clearing it out again staff continued cpr and went to get new pads, during that time the defib put out a small shock with cpr in progress and no charging of the machine.Staff replaced the pads and the machine worked appropriately after and provide multiple shocks after.The patient had been coded for an hour and a half prior to malfunction.
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