I never had anxiety in my daily practice in the OR but anesthesia in the MRI suite ALWAYS provoked anxiety because:
1. I had to anesthetize the patient in the sub-basement, two floors below the main OR — where there were always other anesthesiologists able to help in an emergency. In the MRI suite, no one could hear my silent screams if I got in trouble nor were there knowledgeable extra hands to, for example, squeeze the breathing bag if I needed to prepare for an emergency intubation.
2. Once the patient was anesthetized and the heavy door to the MRI machine room was closed and locked, I could only monitor my unconscious patient through a darkened heavy glass window. Sure, I had monitors for EKG and oxygen saturation outside the MRI room, near the control board where technicians operated the machine, but the automatic blood pressure cuff inflator dial on the anesthesia machine was inside the room and hard to see through the dark glass.
3. It was my good fortune to never have had an emergency in the MRI suite, but events such as that reported above in the OP happened from time to time in hospitals throughout the U.S. and were occasionally reported in the anesthesia literature with the expected cautionary advice. Many more events occurred than were reported.