Question

A 64-year-old man with chronic kidney disease stage 3 presents with serum sodium 122 mmol/L. He is euvolaemic clinically, on a thiazide diuretic and SSRIs. Plasma osmolality is low, urine osmolality is high and urine sodium is elevated. Which diagnosis best fits these findings?

Accepted Answer

Syndrome of inappropriate antidiuretic hormone secretion (SIADH)

Answer

Hyperglycaemic hyponatraemia

Answer

Hypovolaemic hyponatraemia due to diuretics alone

Answer

Pseudohyponatraemia due to hyperlipidaemia

Answer

Primary polydipsia

Practice question

A 64-year-old man with chronic kidney disease stage 3 presents with serum sodium 122 mmol/L. He is euvolaemic clinically, on a thiazide diuretic and SSRIs. Plasma osmolality is low, urine osmolality is high and urine sodium is elevated. Which diagnosis best fits these findings?