Lu sur : https://www.ncbi.nlm.nih.gov/pubmed/32140629
Injections de toxine botulique associées à une myasthénie grave soupçonnée: une cause sous-estimée de la présentation clinique de type MG.
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Titre de l'article Botulinum toxin injections associated with suspected myasthenia gravis: An underappreciated cause of MG-like clinical presentation.
Date de l'article Clin Neurophysiol Pract. 2020 Feb 7;5:46-49. doi: 10.1016/j.cnp.2020.01.002. eCollection 2020.
Contenu de l'article Introduction: The application of botulinum toxin type A (BoNTA) is accelerating, and this includes the uncontrolled cosmetic use of the BoNTA. Diffusion of BoNTA can disturb neuromuscular transmission in several surrounding and distant muscles and result in clinical manifestations similar to myasthenia gravis (MG).
Case presentations: We report two cases of patients referred for neurophysiological evaluation of suspected MG. A 55-year-old female who experienced dysphagia, dysarthria, right-sided ptosis, and neck extensor muscle weakness; and a 46-year-old male who presented with episodic double vision and right-sided ptosis. Both had the history of previous BoNTA use for cosmetic purposes and for the treatment of migraine before the presentation of their symptoms. In both cases examination revealed normal RNS, quite remarkably increased jitter, and signs of denervation and reinnervation in muscles surrounding the injection sites. After extensive neurophysiological evaluations, the primary cause of their symptoms was found to be related to previous BoNTA injections rather than a primary neuromuscular transmission disorder. It could also be concluded that patients do not automatically inform their physicians about cosmetic BoNTA use and they may not be aware of the potential risks associated with BoNTA therapy.
Conclusions: The presented cases illustrate the neurophysiological findings in two patients with suspected MG after the use of BoNTA and emphasize the importance of inquiring about previous BoNTA injections and highlight that it is essential that patients are informed about possible side effects of BoNTA therapy.
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