True about myasthenia gravis: (A) Associated with thymomoa in 3/4 of cases, (B) Incremental response seen with repetitive electric stimuli, (C) Skeletal muscle function improve after rest, (D) Edrophonium test negative
Answer is C. *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