Quote:
Originally Posted by Geode
So if the EMG equipment never touched my eyelids, is it possible my levator is affected, but wouldn't have shown up on the EMG? Is it a different muscle than the levator that causes ptosis in myasthenia gravis?
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Yes, they test the orbicularis occuli, which is responsible for closing the eyes not keep them open. The assumption is that if the levator is effected the orbicularis occuli will also be effected.
The other assumption is that if you have occular myasthenia, your SFEMG (testing your eye muscles) may be normal, but if you have generalized myasthenia it has to be abnormal.
I have to admit that I never understood the logic behind those assumptions, but guess I am not smart enough. At some point I just stopped trying.