The device was not returned to zoll medical corporation for evaluation.Instead, the data file of the customer's report was provided.Review of the data file did show the customer's report.The log observed the first analysis was shock advised with no shock delivered as the patient impedance was below the valid range, indicating a short circuit was detected.A double change batteries prompt is issued when the device cannot perform its essential functions and disables the ability to charge and discharge.The device can recognize a shorted patient impedance for multiple reasons not related to a device malfunction, including but not limited to proximity of the pads on the patient due to shifting during cpr, patient skin condition, or a pads malfunction.It appears the observed short was outside of the scope of the device, as there are no recorded errors to the device log.Analysis of reports of this type has not identified an increase in trend.
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