The patient denies jaw pain, headache, trauma, visual problems, or weakness in his arms or legs. He has had no fevers and he does not use alcohol(Drug information on alcohol) or illicit drugs. His past medical history is notable for basal cell carcinoma, and hypertension for which he takes furosemide(Drug information on furosemide) and metoprolol(Drug information on metoprolol). He is married and denies any recent travel other than to Hawaii where he and his wife own a time-share.
When you enter the examination room, the patient is seated in the position shown.
His vital signs are all within normal limits. Extra-ocular movements are full and without nystagmus. The oropharynx is clear and moist, but phonation seems weak and a bit nasal and speech is slightly slurred. The patient’s teeth and mandible show no tenderness or swelling. His cranial nerves are otherwise intact.
Examination of the neck shows no mass, swelling or jugular-venous distention. Findings from examination of the back, chest, and abdomen are all unremarkable, and there is no peripheral edema. The neurologic examination is normal except for the findings already mentioned.
Laboratory data, including a complete blood cell count and chemistry panel, are normal except for a potassium level of 3.1 mEq/L (normal, 3.5 to 5.0). CT scans of the brain show only age-related changes.
What do you suspect is causing this man’s symptoms, and what else should be in the differential diagnosis? What would you do next?
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