Using mcgrath to intubate patient with altered loc, who was traumatic head injury.Mcgrath turned on the screen illuminated just as medical personnel were placing mcgrath blade in patient's mouth to visualize structures, the screen went black.Power button pushed again and the screen re-illuminated.Visualization attempted a second time and the screen went black again, as personnel moved hand the screen lit up.The battery was exchanged with new battery between first attempt and second.All equipment checked out on checks in the am at start of shift.
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