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Thymectomy in myasthenia gravis a review

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Abstract

The role of thymectomy in the management of myasthenia gravis is reviewed in the light of the published data and of a personal series. The patients in whom the operation is most successful are non thymomatous patients aged between 10 and 40 years with an MG history of less than 3 years. There is no sex prevalence. Lasting improvement may be expected. There are no proven correlations between biological indices like the germinal centers in the thymus and/or AChR antibody titers and the postoperative course of the disease. Complete removal of the thymus seems to be crucial and hence the transsternal approach is preferred. The operation, less effective in patients with thymona than in those with an active thymus, is nonetheless necessary to in these patients prevent putative damage to surrounding organs from thymona infiltration. Why thymectomy should be effective in patients with an active thymus and not in those with a thymona may be revealed by in vitro studies of the interactions between thymic cells and peripheral B cells, now in progress.

Sommario

Viene rivisto alla luce dei dati della letteratura e della casistica personale il ruolo della timectomia nella terapia della miastenia. Dei pazienti non portatori di timoma i migliori risultati si ottengono in quelli di età fra i 10 e i 40 anni con una durata della malattia minore di tre anni. Non vi è prevalenza di sesso. Ci si può attendere un miglioramento duraturo. Non vi sono prove di una correlazione tra gli indici biologici germinativi quali i centri germinali nel timo e o il titolo degli anticorpi contro i ricettori acetilcolinici e il decorso post-operatorio della malattia. É fondamentale la completa asportazione del timo e perciò è preferibile la scelta della tecnica di approccio transternale.

Nei pazienti con timoma la timectomia è meno efficace ma l'intervento è necessario per evitare danni derivanti dall'infiltrazione del timoma sugli organi circostanti. Il perché della efficacia della timectomia nei pazienti con un timo attivo ma non in quelli con timoma potrà essere chiarito dagli studi in vitro sulle interazioni tra cellule timiche e quelle periferiche B, studi che sono ormai in stadio avanzato.

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  1. State University of Groningen, Groningen, The Netherlands

    Hans J. G. H. Oosterhuis M.D. (Professor of Clinical Neurology)

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Oosterhuis, H.J.G.H. Thymectomy in myasthenia gravis a review. Ital J Neuro Sci 4, 399–407 (1983). https://doi.org/10.1007/BF02125618

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