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Focal Myopathic Changes Produced by Electromyographic and Hypodermic Needles"Needle Myopathy"
W. King Engel, MD
Arch Neurol. 1967;16(5):509-511.
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| Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings. |
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MUSCLE biopsy is intentionally done hours to a few days after the electromyographic (EMG) examination and in the same region of muscle in some clinics, with the hope of determining the muscle pathology responsible for the electrical responses. At many other institutions, the order of EMG and muscle biopsy is indifferent, as is the relationship of the sites of the two procedures. When evaluating reports of subtle histologic abnormalities of muscle in patients also thoroughly studied by EMG which do not mention time and geographic relationships of these two examinations, it is difficult not to assume such indifference. It is, therefore, pertinent to emphasize that focal myopathic changes can be produced by EMG and hypodermic needles. The practical implication is that a muscle biopsy must not be taken from a previously needled site. Conversely, EMG or hypodermic needling must not be done in a site to be biopsied.
Methods
. . . [Full Text PDF of this Article]
Author Affiliations
Bethesda, Md
From the Medical Neurology Branch, National Institute of Neurological Diseases and Blindness, National Institutes of Health, US Public Health Service, Department of Health, Education, and Welfare, Bethesda.
Footnotes
Submitted for publication Dec 27, 1966; accepted Jan 18, 1967.
Reprint requests to Medical Neurology Branch, National Institute for Neurological Diseases and Blindness, Bethesda, Md 20014 (Dr. Engel).
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