Review Question - QID 212558

A 56-year-old man is brought to the clinic by his wife for complaints of progressive weakness for the past 3 months. He reports difficulty eating, especially when chewing foods like steak. The wife complains that he has been “out of it lately and has been forgetting my birthday." His past medical history is significant for celiac disease, for which he eats a gluten-free diet. He reports that he stepped on a nail last week, but the nail did not seem rusty so he just washed his feet afterward. His wife reports that he has been up to date on his tetanus vaccinations. Physical examination demonstrates weakness and fasciculations of the left upper extremity along with spastic clonus of the left ankle. The patient denies gait disturbances, vision or hearing changes, headaches, nausea/vomiting, gastrointestinal disturbances, or incontinence. What is best next step in terms of management for this patient?