Myasthenia gravis natural history, complications and prognosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Prognosis

With treatment, patients have a normal life expectancy, except for those with a malignant thymoma (whose lesser life expectancy is on account of the thymoma itself and is otherwise unrelated to the myasthenia). Quality of life can vary depending on the severity and the cause. The drugs used to control MG either diminish in effectiveness over time (cholinesterase inhibitors) or cause severe side effects of their own (immunosupressants). A small percentage (around 10%) of MG patients are found to have tumors in their thymus glands, in which case a thymectomy is a very effective treatment with long-term remission. However, most patients need treatment for the remainder of their lives, and their abilities vary greatly. It should be noted that MG is not usually a progressive disease. The symptoms may come and go, but the symptoms usually do not get worse as the patient ages. For some, the symptoms decrease after a span of 3–5 years.

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