Review Question - QID 108543

A 28-year-old female presents to her primary care doctor complaining of new onset blurry vision. She first noticed her vision getting blurry toward the end of the day several days ago. Since then, she reports that her vision has been fine when she wakes up but gets worse throughout the day. She has also noticed that her eyelids have started to droop before she goes to bed. On exam, she has bilateral ptosis that is worse on the right. Administering edrophonium to this patient leads to an immediate improvement in her symptoms. Which of the following is most likely true about this patient’s condition?