Another Perspective on Fasciculations: When is it not Caused by the Classic form of Amyotrophic Lateral Sclerosis or Progressive Spinal Atrophy?

Marco Antonio Araujo Leite, Marco Orsini, Marcos R G de Freitas, João Santos Pereira, Fábio Henrique Porto Gobbi, Victor Hugo Bastos, Dionis de Castro Machado, Sergio Machado, Oscar Arrias-Carrion, Jano Alves de Souza, Acary Bulle Oliveira, Marco Antonio Araujo Leite, Marco Orsini, Marcos R G de Freitas, João Santos Pereira, Fábio Henrique Porto Gobbi, Victor Hugo Bastos, Dionis de Castro Machado, Sergio Machado, Oscar Arrias-Carrion, Jano Alves de Souza, Acary Bulle Oliveira

Abstract

Fasciculations are visible, fine and fast, sometimes vermicular contractions of fine muscle fibers that occur spontaneously and intermittently. The aim of this article is to discuss the main causes for fasciculations and their pathophysiology in different sites of the central/peripheral injury and in particular to disprove that the presence of this finding in the neurological examination is indicative of amyotrophic lateral sclerosis. Undoubtedly, most fasciculations have a distal origin in the motor nerve both in normal subjects and in patients with motor neuron disease. Most of them spread to other dendritic spines often producing an antidromic impulse in the main axon. The clinical and neurophysiological diagnosis must be thorough. It may often take long to record fasciculations with electroneuromyography. In other cases, temporal monitoring is necessary before the diagnosis. The treatment, which may be adequate in some cases, is not always necessary.

Keywords: electromyography treatment; fasciculations; neurological diseases.

Conflict of interest statement

Conflict of interests: the authors declare no potential conflict of interests.

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