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DOI: 10.1055/s-0043-1772599
F-waves persistence in peripheral sensory syndromes
Persistência das ondas-F nas síndromes sensitivas periféricas![](https://www.thieme-connect.de/media/10.1055-s-00054595/202309/lookinside/thumbnails/10-1055-s-0043-1772599_220144-1.jpg)
Abstract
Background The distinction between sensory neuronopathies (SN), which is by definition purely sensory, and sensory polyneuropathies (SP) and sensory multineuropathies (SM) is important for etiologic investigation and prognosis estimation. However, this task is often challenging in clinical practice. We hypothesize that F-wave assessment might be helpful, since it is able to detect subtle signs of motor involvement, which are found in SP and SM, but not in SN.
Objective The aim of the present study was to determine whether F-waves are useful to distinguish SN from SP and SM.
Methods We selected 21 patients with SP (12 diabetes mellitus, 4 transthyretin familial amyloid polyneuropathy, 4 others), 22 with SM (22 leprosy), and 26 with SN (13 immune-mediated, 10 idiopathic, 3 others) according to clinical-electrophysiological-etiological criteria. For every subject, we collected data on height and performed 20 supramaximal distal stimuli in median, ulnar, peroneal, and tibial nerves, bilaterally, to record F-waves. Latencies (minimum and mean) and persistences were compared across groups using the Kruskal-Wallis and Bonferroni tests. P-values < 0.05 were considered significant.
Results All groups were age, gender, and height-matched. Overall, there were no significant between-group differences regarding F-wave latencies. In contrast, F-wave persistence was able to stratify the groups. Peroneal F-wave persistence was higher, bilaterally, in the SN group compared to SM and SP (p < 0.05). In addition, F-waves persistence of the ulnar and tibial nerves was also helpful to separate SN from SP (p < 0.05).
Conclusion F-wave persistence of the peroneal nerves might be an additional and useful diagnostic tool to differentiate peripheral sensory syndromes.
Resumo
Antecedentes A distinção entre neuronopatias sensitivas (SN) e polineuropatias sensitivas (SP) e multineuropatias sensitivas (SM) é importante para a investigação etiológica e para o prognóstico. Contudo, esta tarefa é desafiadora na prática clínica. Hipotetizou-se que a avaliação das ondas-F pode ser útil, por ser capaz de detectar envolvimento motor nas SP e SM, mas não nas SN.
Objetivo Determinar se as ondas-F podem ajudar a distinguir entre SN, SP e SM.
Métodos Selecionou-se 21 pacientes com SP (12 diabetes mellitus, 4 ATTR-FAP e 4 com outras neuropatias), 22 com SM (22 hanseníases) e 26 com SN (13 imunomediadas, 10 idiopáticas e 3 com outras neuronopatias), de acordo com critérios clínicos, etiológicos e eletrofisiológicos. Para cada indivíduo, foi aferida a altura e foram aplicados 20 estímulos distais supramáximos nos nervos mediano, ulnar, fibular e tibial, bilateralmente, para registrar as ondas-F. Uma comparação foi feita, por grupo, das latências (mínimas e médias) e persistências pelos testes Kruskal-Wallis e Bonferroni. Valores de p < 0.05 foram considerados estatisticamente significativos.
Resultados Todos os grupos foram pareados por idade, sexo e altura. Não houve diferença estatística significativa entre os grupos quanto às latências das ondas-F. A persistência da onda-F foi capaz de estratificar os grupos, sendo as dos nervos fibulares bilateralmente maiores no grupo SN que nos grupos SM e SP (p < 0.05). Adicionalmente, a persistência das ondas-F dos nervos ulnares e tibiais também foi útil para distinguir SN de SP (p < 0.05).
Conclusão A persistência das ondas-F dos nervos fibulares pode ser uma ferramenta adicional e útil para diferenciar síndromes sensitivas periféricas.
Keywords
Nerve Conduction Studies - Polyneuropathies - Mononeuropathies - Hereditary Sensory and Autonomic NeuropathiesPalavras-chave
Estudos de Condução Nervosa - Polineuropatias - Mononeuropatias - Neuropatias Hereditárias Sensoriais e AutônomasAuthors' Contributions
FDL, ARMM, GSS, MCFJ: wrote the manuscript; FDL, ARMM, GSS, MCFJ: interpreted and analyzed data; FDL, ARMM, MCFJ: designed the research methodology; FDL, ARMM: both authors contributed equally to this article and should be considered co-first authors. All authors performed research, reviewed, and edited the final manuscript.
Support
This study was funded by the São Paulo Research Foundation, (Fundação de Amparo à Pesquisa do Estado de São Paulo - FAPESP - grants 2013/01766-7 and 13/26410-0).
Publikationsverlauf
Eingereicht: 08. März 2023
Angenommen: 12. Mai 2023
Artikel online veröffentlicht:
04. Oktober 2023
© 2023. Academia Brasileira de Neurologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution 4.0 International License, permitting copying and reproduction so long as the original work is given appropriate credit (https://creativecommons.org/licenses/by/4.0/)
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