21st May 2025

You are asked to see a 90-year-old gentleman who has become confused on the respiratory ward.

You are asked to see a 90-year-old gentleman who has become confused on the respiratory ward. His sodium is noted to be 124 mmol/L. He is euvolaemic, with a urine osmolality of 150 mOsmol/kg and urine sodium of 35 mOsmol/kg.

Which of the following respiratory conditions are most likely to have caused this condition? Please select only ONE answer.