You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is True about myasthenia gravis and explain in detail?
*The weakness increase during repeated use and may improve following sleep or rest.only 10% of cases are associated with thymomas 65% with hyperplasia of thymus. Edrophonium test is positive. In electrodiagnostic testing MG patients show a rapid reduction of >10-15% in the amplitude of evoked response. Ref Harrison20th edition pg 2445