A 45-year-old woman presents with fluctuating double vision and drooping of her eyelids, which worsens towards the evening.
A 45-year-old woman presents with fluctuating double vision and drooping of her eyelids, which worsens towards the evening. She also reports difficulty in swallowing and occasional slurring of speech. There is no significant past medical history, and she is not on any medication.
Which investigation is most likely to confirm the diagnosis?
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