Twitch response in a myopathy with impaired relaxation but no myotonia | Zendy

Quinlan John G. | Zendy; Iaizzo Paul A. | Zendy; Gronert Gerald A. | Zendy; Lambert Edward H. | Zendy

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Twitch response in a myopathy with impaired relaxation but no myotonia

Author(s) -

Quinlan John G.,

Iaizzo Paul A.,

Gronert Gerald A.,

Lambert Edward H.

Publication year - 1990

Publication title -

muscle and nerve

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.025

H-Index - 145

eISSN - 1097-4598

pISSN - 0148-639X

DOI - 10.1002/mus.880130408

Subject(s) - myotonia , myopathy , medicine , ankle , stimulation , relaxation (psychology) , muscle relaxation , motor unit , nerve stimulation , anesthesia , electromyography , physical medicine and rehabilitation , anatomy , myotonic dystrophy

A patient with slow muscle relaxation but without accompanying motor unit or myotonic electrical activity had a unique staircase twitch response to repeated nerve stimulation. During 1‐Hz stimulation, twitches recorded by measurement of the ankle dorsiflexor group displayed progressively increasing relaxation times with successive stimuli (37% increase) unlike the progressively decreasing relaxation time of the normal response (12–37% decrease). The response may be diagnostic of this unusual myopathy; the test methods are noninvasive and easily tolerated.

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