Sural/radial amplitude ratio in the diagnosis of mild axonal polyneuropathy.
Muscle Nerve
; 20(10): 1236-41, 1997 Oct.
Article
en En
| MEDLINE
| ID: mdl-9324079
ABSTRACT
As proximal nerves are relatively spared in length-dependent, axonal polyneuropathy, we theorized that a sural/radial amplitude ratio (SRAR) might be a sensitive indicator of mild polyneuropathy. In this study, sural amplitudes and SRARs in patients with signs of mild axonal polyneuropathy were compared to those of normal, age-matched control subjects. Sural and radial sensory responses were measured in a standard fashion in all subjects. Thirty polyneuropathy patients had an average SRAR of 0.29 as compared to 0.71 for the 30 normal subjects. An SRAR of less than 0.40 was a strong predictor of axonal polyneuropathy, with 90% sensitivity and 90% specificity, as compared to an absolute sural amplitude of less than 6.0 microV, which had sensitivity of only 66%. Additionally, unlike the sural amplitude, the ratio did not vary significantly with age. We conclude that the SRAR is a sensitive, specific, age-independent electrodiagnostic test for mild axonal polyneuropathy.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Nervio Radial
/
Axones
/
Nervio Sural
/
Enfermedades del Sistema Nervioso Periférico
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
Límite:
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Muscle Nerve
Año:
1997
Tipo del documento:
Article
País de afiliación:
Estados Unidos