Optimal reference electrode placement for accessory and axillary nerve conduction studies.
Muscle Nerve
; 61(5): 632-639, 2020 05.
Article
em En
| MEDLINE
| ID: mdl-32108362
ABSTRACT
BACKGROUND:
Various techniques are described for proximal motor nerve conduction studies (NCSs). We investigated alternative reference electrode (E2) locations for accessory and axillary NCSs.METHODS:
Multi-channel recordings were made from trapezius or deltoid referred to different sites, and from those sites referred to a remote electrode. Responses were compared using grouped statistics, and correlation analysis.RESULTS:
For accessory NCSs, all bellyE2 montages showed comparable responses but axillary NCSs were more variable. Low amplitude contamination was seen at the sternum and contralateral acromion but greater distortion using other potential E2 sites. In both accessory and axillary studies, the ipsilateral acromion showed moderate activity, which correlated with the bellyremote response.CONCLUSIONS:
Variation in E2 electrode sites may significantly distort the measured compound muscle action potential (CMAP). For accessory and axillary NCS, a sternal reference has favorable characteristics. Other sites, such as ipsilateral acromion or deltoid insertion, may not yield a representative CMAP.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Plexo Braquial
/
Potenciais de Ação
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Eletrodos
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Eletrodiagnóstico
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Músculo Deltoide
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Músculos Superficiais do Dorso
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Nervo Acessório
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Condução Nervosa
Limite:
Adult
/
Aged
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Aged80
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Female
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Humans
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Male
/
Middle aged
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article