Pulse oximeter functional, displaying reading at 6 pm.The pulse oximeter had been observed to be functioning and displaying readings within normal limits for the pt.At or around 9:20 pm, the device screen was reported to be "lit" but was not displaying numerical readings.Within mins of the finding, the resident was observed to be non-responsive with medical services provided.Ems arrived and attempted to revive the pt without success.The resident expired.Per interview with staff, it could not be determined as to cause of "altoed" function of the device.The device was taken out of service immediately.
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