British Journal of Anaesthesia, 1988, Vol. 61, No. 3 270-278
© 1988 The Board of Management and Trustees of the British Journal of Anaesthesia
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MEASUREMENT OF EVOKED DIAPHRAGM TWITCH STRENGTH DURING ANAESTHESIA
Adaptation and Evaluation of an Existing Technique
University Department of Anaesthesia, Leicester Royal Infirmary Leicester LEI 5WW
Correspondence to M.C.D.
The technique of recording the mechanical response of the diaphragm after the transcu-taneous stimulation of the phrenic nerve, during anaesthesia and surgery, is described in patients undergoing non-abdominal surgery. The pressure difference generated across the diaphragm after phrenic nerve stimulation was derived from the simultaneous recording of gastric and oesophageal pressures with air-filled balloon catheter systems. This was recorded as the diaphragm "twitch" in a manner similar to that of peripheral muscles. Special problems encountered in the use and the validation of the technique in the anaesthetized patient are considered.
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