1. How does juvenile myasthenia present?
2. How is junenile myasthenia diagnosed?
3. What does repetitive nerve stim show in autoimmune myasthenia gravis?
Answers:
1. Often in adolescent girls, often severe, with ptosis and ophthalmoplegia, weakness in face, jaw, swallowing, speech, respiration, proximal muscles.
2. Fatigability of muscle after stim of nerve at 4-10 Hz, response to Tensilon, single fiber EMG.
3. Decrement in CMAP with slow stimulation greater than 12-15%.
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