ArticleArquivos de neuro-psiquiatria2025
Dosage of botulinum toxin in patients undergoing treatment for hemifacial spasm: is there modification during follow-up?
Article in Arquivos de neuro-psiquiatria, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe movement disorder known as hemifacial spasm is characterized by involuntary contractions of the muscles that are innervated by the facial nerve. The treatment of choice for this condition is botulinum toxin injections.
objectiveTo analyze the botulinum toxin dosage in patients undergoing treatment for hemifacial spasm during a 14-year period.
methodsA retrospective study of medical records from patients treated at the Neurology Service of Hospital Universitário Onofre Lopes, Universidade Federal do Rio Grande do Norte, from 2010 to 2024, was performed.
resultsA total of 151 patients met the inclusion criteria. The dose of botulinum toxin revealed a statistically significant increase during the first 3.46 years of follow-up. In the long-term, a trend toward dose stabilization was identified. The median latency for the onset of effect was 4 days, while the median duration of effect was 3 months. All side effects were temporary, with the most common being hemifacial weakness (17.9%) and palpebral ptosis (3.3%). Most patients presented primary hemifacial spasm (88.1%), with a neurovascular conflict identified in 24.1% of cases.
conclusionThe increase in botulinum toxin dosage during the first years may be explained by dosage adjustment to control hemifacial spasm with the lowest possible doses. A prolonged interval between applications may also be associated with this increase. Dose stabilization tends to be achieved over time, indicating disease control.
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