Snapshot A 68-year-old man is brought by EMS to the emergency department from his retirement home. He was found to be excessively somnolent by his nurse earlier in the morning, prompting her to become alarmed and call for help. Upon presentation to the hospital, the patient is alert and oriented to self and correctly answers that he is at the hospital, but he states that the year is 1940. He is admitted to the inpatient unit overnight. The next day, the resident physician examines the patient multiple times during the morning and afternoon and finds that he is somnolent, difficult to arouse, and responds with only incoherent grunts before returning to a slumber. The patient's medical history is significant for hypertension and hyperlipidemia. Introduction Overview login to view 1 more bullet Epidemiology login to view 6 more bullets Pathophysiology login to view 8 more bullets Prognosis login to view 2 more bullets Presentation Symptoms login to view 10 more bullets Differential Major neurocognitive disorder login to view 2 more bullets Schizophrenia login to view 2 more bullets Major depressive disorder login to view 2 more bullets Treatment Lifestyle login to view 5 more bullets Medical login to view 9 more bullets Complications Malnutrition Falls Long-term cognitive impairment