Document Detail

Asymmetry of Motor Unit Number Estimate and Its Rate of Decline in Patients With Amyotrophic Lateral Sclerosis.
MedLine Citation:
PMID:  21946374     Owner:  NLM     Status:  Publisher    
SUMMARY: This study was performed to investigate the asymmetry of motor unit number estimate (MUNE) and its longitudinal course in patients with amyotrophic lateral sclerosis. A modified statistical MUNE was performed at the hypothenar muscles bilaterally in a total of 135 patients, and 18 of these patients underwent a follow-up study. The degree of asymmetry varied considerably among those patients whose average MUNE of both sides was moderately reduced, whereas it tended to be low in those whose average MUNE was either severely reduced or close to normal. The rate of motor unit loss was also asymmetric, and two distinct patterns were identified. In patients whose MUNE was greater than 30 in both sides (n = 7), the rate of motor unit loss tended to be greater in the initially more affected side compared with the contralateral one, yielding the so-called lead phenomenon. In contrast, the other patients (n = 11) tended to show the opposite pattern of "catch-up," that is, MUNE declined faster in the initially less affected side compared with the contralateral one. This study shows that not only the MUNE but also the rate of motor unit loss are frequently asymmetric in amyotrophic lateral sclerosis patients.
Suk-Won Ahn; Jee-Eun Kim; Jung-Joon Sung; Kwang-Woo Lee; Yoon-Ho Hong
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-23
Journal Detail:
Title:  Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society     Volume:  -     ISSN:  1537-1603     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8506708     Medline TA:  J Clin Neurophysiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
*Department of Neurology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Republic of Korea †Department of Neurology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea ‡Department of Neurology, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Republic of Korea.
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