Butch, a 76-year-old that you follow in your practice is bro…
Butch, a 76-year-old that you follow in your practice is brought in by his wife who is concerned regarding recent behavior changes. Apparently over the past two days, he has been very agitated and restless, decreased lucidity, and has slept very poorly. He is only able to recall recent events. Given just this information, his most likely diagnosis is: