Document Detail

F-waves and facilitated late responses of the mentalis muscle in patients with a cerebrovascular accident.
MedLine Citation:
PMID:  11045019     Owner:  NLM     Status:  MEDLINE    
F-waves in the extremities result from the backfiring of antidromically activated anterior horn cells and F-waves of the mentalis muscle can be also elicited after stimulation of the marginal mandibular branch of the facial nerve. In order to investigate the influence of the descending pathway of the excitability of the facial motonucleus, the F-wave of the mentalis muscle and the facilitated late response, which follows F-waves and which seems to be the snout reflex due to their similar latency and habituation, were studied in 11 conscious patients with a hemispheric cerebrovascular accident (CVA) presenting with hemiparesis, and in 10 unconscious patients with CVA or head injury. The duration and the persistence of the F-waves increased significantly statistically on the normal side in the CVA patients compared with those of the palsy side and the normal subjects. In comatose patients the F-waves and the facilitated late response were not elicited. The latency (46.1 +/- 13.3 msec) of the facilitated late responses in the unconscious patients tended to increase compared with the latency (36.6 +/- 4.3 msec) in the conscious patients. These findings suggest that the hyperexcitability of the facial motoneuron is ipsilateral to any hemispheric lesion; the hemispheric lesion exerts a bilateral excitatory influence on the interneuron of the facilitated late response: and that the reticular formation may influence the facial motoneuron and any interneurons concerned in the facilitated late response. F-waves and facilitated late responses should be further examined as neurophysiologically useful diagnostic methods.
M Ishikawa; J Namiki; M Takase; T Kawase
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neurological research     Volume:  22     ISSN:  0161-6412     ISO Abbreviation:  Neurol. Res.     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2001-02-06     Completed Date:  2001-02-08     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7905298     Medline TA:  Neurol Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  576-82     Citation Subset:  IM    
Department of Neurosurgery, Saitama National Hospital, Japan.
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MeSH Terms
Consciousness Disorders / physiopathology
Craniocerebral Trauma / physiopathology
Electromyography / methods
Facial Muscles / physiopathology*
Functional Laterality
Paresis / physiopathology
Reaction Time
Stroke / physiopathology*
Unconsciousness / etiology,  physiopathology

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

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