The study equipment was placed on patient and the study was started.When it was time for the study to end, the ph machine had a blank, lit blue screen and was unresponsive.Batteries were removed to turn off machine.The batteries were switched, the machine was turned back on, and machine was functional but had no record of ph/mcr study.There was no record of the study on the sd card either.The study data was lost and the test had to be repeated.Manufacturer response for ph monitoring device, zephyr ph monitoring system (per site reporter): exchanged part that was unrepairable.
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