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Abstract
Myasthenia gravis (MG) is an autoimmune neuromuscular transmission disorder where well-defined autoantibodies against muscle and muscle cell membrane molecules are directly pathogenetic. All MG patients should be defined for subtype, as such a subclassification has treatment consequences. Ocular MG, early-onset MG, late-onset MG, MG with thymoma, MG with anti-muscle-specific tyrosine kinase antibodies and MG with no defined antibodies constitute the six MG categories. The MG diagnostic process includes neurophysiology, neuroimmunology, neuropharmacology and imaging. In addition to symptomatic therapy with acetylcholine esterase inhibitors, most patients need thymectomy and/or immunosuppressive drugs. Today’s treatment is not immunospecific and far from antigen-specific, even if the pathogenesis is known in detail. Strategies for acetylcholine receptor tolerance induction, manipulating acetylcholine receptor antigen presentation or suppressing acetylcholine receptor-specific B-cells or plasma cells work in experimental MG, but have not yet been attempted properly for the human disease, or they do not work. Apart from the 10–15% of patients with paraneoplastic MG, the cause of the disease is not known. Until curative or antigen-specific therapy become available, the well-established treatment gives good-to-excellent results in most patients, with acceptable quality of life and no increased mortality. Acute and intensive care treatment during MG exacerbation is a cornerstone in the treatment.
Financial & competing interests disclosure
The EU grant 2005105 (Euromyasthenia) and the Norwegian Muscle disease Association (Foreningen for Muskelsyke) are acknowledged for supporting this work. The author has no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.
No writing assistance was utilized in the production of this manuscript.