28th May 2025

A 62-year-old man attends the emergency department.

A 62-year-old man attends the emergency department. His husband has brought him in because he has been confused and appears to be having hallucinations. The patient is normally fit and well and continues to work as a secondary school teacher.

The patient is not orientated to time, person, or place, and at times during your assessment, he appears quite lethargic and drowsy.

HR 118, BP 104/68, Temperature 37.7, SpO2 98% on room air, RR 18.

What is the most likely diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.