The use of the electromyograph (EMG) in clinical diagnosis is now firmly established. Its application in human neurological disorders was described in 1938 by Denny-Brown and Pennybacker.1 It has been, however, only in the past 12 years that the specific value of the instrument has gained widespread recognition.* This field of clinical electromyography has been covered in excellent fashion by Marinacci in his monograph published in 1955. All workers have noted that the EMG is a laboratory instrument which supplements, but obviously cannot replace, accurate clinical examinations.
The technical accuracy of electromyography depends on two primary factors: a trained electromyographer and an instrument of high fidelity. This instrument should consist of a cathode ray oscilloscope, a sensitive sound amplifier, and methods for permanently recording the electromyogram obtained (tape recording and synchronized cameras). A fine monopolar needle electrode inserted directly into skeletal muscle is used to pick up normal or
SHEA PA, WOODS WW. Electromyography as an Aid in Clinical Diagnosis. AMA Arch Intern Med. 1955;96(6):787–793. doi:10.1001/archinte.1955.00250170093014
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