Patient Hx validates what is happening at the bedside. Last week I walked into the room and all the monitors had been shut off.. Looking back on Patient Hx I was able to see the exact time when the monitors were pulled off and also able to see that the shape of the waveform was bad but the numbers were ok. I could tell when the pulse ox stopped picking up and what time we were in the room. The numbers and waveforms made it clear the patient had not had a sentinel event. And I had all the evidence to back this up and even send the complete history to the EMR.