Following open heart procedure, while pt still in the operating room and connected to the anesthesia machine, patient's sao2 and bp were dropping.At this time the physician and the staff did not hear any audible alarms being triggered on the anesthesia machine.No adverse effect to the patient as a result of this event.Equipment tested by (b)(6) hospital clinical tech, department as well as field service engineer of the mfr.Internal and external investigation deemed equipment to be functioning per mfr specifications.
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