Contralateral Upper Limb Weakness Following Botulinum Toxin A Injection for Poststroke Spasticity

• Autor(es): Camões-Barbosa, A ; Ribeiro, I ; Medeiros, L
• Data: 2019
• Identificador Persistente: http://hdl.handle.net/10400.10/2331
• Origem: Repositório do Hospital Prof. Doutor Fernando Fonseca
• Assunto(s): Botulinum toxins type A; Muscle weakness
• Tipo de Documento: Artigo científico
• Idioma: Inglês
• Contribuidor(es): Unidade Local de Saúde Amadora / Sintra

Descrição

Botulinum toxin type A has been approved for spasticity management in poststroke patients. The adverse effects are generally of two types: those related to local injection; and those related to the systemic effects from spread of the toxin. Contralateral weakness after botulinum toxin A treatment is a rarely reported adverse effect. We report the case of a 33-year-old female who had been receiving regular injections of incobotulinum toxin A due to spasticity of the right limbs after a hemorrhagic stroke. A switch was made to abobotulinum toxin A with an overall conversion ratio of 1:3.83. The patient presented contralateral upper limb paresis, especially of the deltoid muscle, in the second week post-injection. The electroneuromyography showed neuromuscular block due to botulinum toxin A. She recovered completely after eight months. A switch between different formulations of botulinum toxin type A should prompt caution when carrying out unit conversions. Distant side effects may appear, including paresis in the contralateral limbs.