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An Electromyographic Study

INGRID GAMSTORP, M.D.; CARL KUPFER, M.D.

Arch Ophthalmol. 1960;64(5):744-750.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Electromyography of skeletal muscles has been in use for over 20 years and has proven to be a valuable diagnostic procedure. In analyzing the parameters of the electromyogram (EMG), Buchthal¹ has pointed out the importance of the mean duration of the muscle action potential (the mean of the duration of 20 different action potentials), noting that the mean duration is influenced less by the electrode position within the muscle or by the patient's cooperation, than are the other parameters.

In 1953-1954, Björk and Kugelberg² and Björk³ alone first applied the techniques of electromyography to the extraocular muscles. In 1955-1957, Breinin^4-7 reported his experience with electromyography of extraocular muscles. Both Björk and Breinin stressed particularly the changes in amplitude and number of action potentials in normal and abnormal extraocular muscles, although Björk and Kugelberg² incidentally mentioned changes in the duration. Although there have been several articles . . . [Full Text PDF of this Article]

Author Affiliations
Boston

Jerry Lewis Fellow of the Muscular Dystrophy Associations of America (Dr. Gamstorp).; From the Department of Neurology and the Howe Laboratory of Ophthalmology, Harvard Medical School, the Neurology Service of the Massachusetts General Hospital, and the Massachusetts Eye and Ear Infirmary.

Footnotes
Submitted for publication Aug. 3, 1960.

Presented in part at the meeting of the American Neurological Association, Boston, June 14, 1960.

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