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Type: Artigo de periódico
Title: Ulnar sensory-motor amplitude ratio: a new tool to differentiate ganglionopathy from polyneuropathy
Author: Garcia, RU
Ricardo, JAG
Horta, CA
Garibaldi, SG
Nucci, A
Franca, MC
Abstract: The objective of this study was to evaluate if the ratio of ulnar sensory nerve action potential (SNAP) over compound muscle action potential (CMAP) amplitudes (USMAR) would help in the distinction between ganglionopathy (GNP) and polyneuropathy (PNP). Methods: We reviewed the nerve conductions studies and electromyography (EMG) of 18 GNP patients, 33 diabetic PNP patients and 56 controls. GNP was defined by simultaneous nerve conduction studies (NCS) and magnetic resonance imaging (MRI) abnormalities. PNP was defined by usual clinical and NCS criteria. We used ANOVA with post-hoc Tukey test and ROC curve analysis to compare ulnar SNAP and CMAP, as well as USMAR in the groups. Results: Ulnar CMAP amplitudes were similar between GNP x PNP x Controls (p=0.253), but ulnar SNAP amplitudes (1.6 +/- 3.2 x 11.9 +/- 9.1 x 45.7 +/- 24.7) and USMAR values (0.3 +/- 0.3 x 1.5 +/- 0.9 x 4.6 +/- 2.2) were significantly different. A USMAR threshold of 0.71 was able to differentiate GNP and PNP (94.4% sensitivity and 90.9% specificity). Conclusions: USMAR is a practical and reliable tool for the differentiation between GNP and PNP.
Subject: clinical neurophysiology
sensory neuronopathy
ulnar nerve
Country: Brasil
Editor: Assoc Arquivos Neuro- Psiquiatria
Citation: Arquivos De Neuro-psiquiatria. Assoc Arquivos Neuro- Psiquiatria, v. 71, n. 7, n. 465, n. 469, 2013.
Rights: aberto
Identifier DOI: 10.1590/0004-282X20130063
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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