With the advent of relaxant agents in anaesthesia, making direct laryngoscopy easier, the employment of endotracheal anaesthesia has increased rapidly during the past decade.Laryngoscope design has been modified to simplify further the manceuvre of laryngoscopy (Macintosh, 1943), and the position of the head and neck which brings the axes of the larynx, pharynx, and mouth into line has been described (Bannister and Macbeth, 1944;Gillespie, 1948)
Neuromuscular blocking agents are widely used in anaesthesia, and a simple quantitative method of monitoring their effects is desirable. This paper describes a new instrument which has been developed for electromyographic monitoring of neuromuscular block by a non-invasive technique which is both reliable and easy to use. The median nerve is stimulated at the wrist and the electromyogram (e.m.g.) from a thenar muscle is detected, rectified and integrated electronically to produce a meter display of the assessment of block. The method is recommended for routine use.
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