To the Editor: In general, it is unwise for the medical practitioner to stray from those fields in which he or she is trained. To illustrate this point, I report the case of an anaesthetist (me) caring for a patient undergoing general anaesthesia for open repair of a fractured ankle.

The operation was nearly over. The ankle had been repaired and the theatre nurse left the scene to assemble the materials needed for a leg cast. The patient was breathing spontaneously via a laryngeal mask airway. Before wound closure, the orthopaedic surgeon requested intraoperative radiography.

A large X-ray machine was wheeled into the theatre, and the radiographer positioned it over the patient, took several images and then left to process the films.

The surgeon wanted to resume surgery immediately, but who was going to remove the unattended x-ray machine, still poised directly over the operative field? I volunteered.

I hit a button on the panel. It manifested as the command for "reverse": accordingly, the machine backed itself into the wall of the operating theatre, trapping me in between.

At the same instant, a loud noise — consistent with partial upper airway obstruction — emanated from the anaesthetised patient. I had to free myself from my captor. Immediately.

My release strategy incorporated pressing most of the buttons on the x-ray machine in a random manner. As all were imprinted with unrecognisable symbols, this seemed a reasonable, and eventually effective (if not a recommended), method for determining the "forward" function.

I quickly returned to the patient's head and managed the airway problem. Thankfully, the patient's oxygen saturation did not decrease and the remainder of the anaesthetic was uneventful (the x-ray machine having been escorted out of the theatre by the radiographer on his welcome return).

Although I had been willing and, in fact, keen to expedite the surgical procedure, I suggest that doctors avoid the lure of driving foreign vehicles (they can be savage beasts).