A 70-year-old man presents with acute confusion. He recently started taking Bendroflumethiazide. Blood tests show: Sodium 118 mmol/L. Serum osmolality...

Question

A 70-year-old man presents with acute confusion. He recently started taking Bendroflumethiazide. Blood tests show: Sodium 118 mmol/L. Serum osmolality is low, and urine osmolality is inappropriately high. He appears euvolaemic. What is the most likely cause of his hyponatraemia?

Accepted Answer

Thiazide diuretic induced hyponatraemia

Answer

Dehydration

Answer

Syndrome of Inappropriate ADH secretion (SIADH)

Answer

Primary polydipsia

Answer

Addison's disease

mrcp part 1 MCQ (SBA): Thiazide-induced Hyponatraemia

A 70-year-old man presents with acute confusion. He recently started taking Bendroflumethiazide. Blood tests show: Sodium 118 mmol/L. Serum osmolality is low, and urine osmolality is inappropriately high. He appears euvolaemic. What is the most likely cause of his hyponatraemia?