Document Detail

On the selection of concentric needle electromyogram motor unit action potentials: is the rise time criterion too restrictive?
MedLine Citation:
PMID:  8941269     Owner:  NLM     Status:  MEDLINE    
Concentric needle electromyogram motor unit action potentials (MUAPs) were recorded from the biceps brachii muscle of normal subjects and in patients with neuromuscular diseases. Although the MUAPs had a crisp sound and appeared sharp, their rise time (RT), measured from the maximum negative peak to the preceding maximum positive peak before it, was often > 500 microseconds. All MUAPs with a RT < or = 500 microseconds were recorded from within the motor unit (MU) territory. MUAP recordings from outside the MU territory had a long RT but also low amplitude (< 50 microV) and/or a characteristic initial negative deflection. In the remaining recordings from within the MU territory, MUAP duration remained relatively constant while MUAP amplitude and RT varied inversely with each other. These MUAPs may be useful in electrodiagnosis but discarded due to their longer RT. We feel that while the current RT criterion for MUAP selection ensures that the electrode tip is within the MU territory, it is also too restrictive.
P E Barkhaus; S D Nandedkar
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Muscle & nerve     Volume:  19     ISSN:  0148-639X     ISO Abbreviation:  Muscle Nerve     Publication Date:  1996 Dec 
Date Detail:
Created Date:  1997-01-02     Completed Date:  1997-01-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7803146     Medline TA:  Muscle Nerve     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1554-60     Citation Subset:  IM    
Department of Neurology, Medical College of Wisconsin, Milwaukee 53226, USA.
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MeSH Terms
Action Potentials
Electromyography / instrumentation,  methods*
Muscles / physiology*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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