Question

A 68-year-old woman is admitted with confusion, hyponatraemia (Na⁺ 118 mmol/L), low serum osmolality and inappropriately high urine sodium and osmolality. She is euvolaemic clinically. What is the most likely diagnosis?

Accepted Answer

Syndrome of inappropriate antidiuretic hormone secretion (SIADH)

Answer

Hypovolaemic hyponatraemia due to diuretics

Answer

Hypervolaemic hyponatraemia due to heart failure

Answer

Psychogenic polydipsia

Answer

Adrenal insufficiency

Practice question

A 68-year-old woman is admitted with confusion, hyponatraemia (Na⁺ 118 mmol/L), low serum osmolality and inappropriately high urine sodium and osmolality. She is euvolaemic clinically. What is the most likely diagnosis?