A 68-year-old woman presents with confusion and unsteadiness. She has a history of small cell lung carcinoma. Serum sodium is 118 mmol/L, serum osmola...

Question

A 68-year-old woman presents with confusion and unsteadiness. She has a history of small cell lung carcinoma. Serum sodium is 118 mmol/L, serum osmolality is low and urine sodium is elevated with inappropriately concentrated urine. She is euvolaemic on examination. Which is the most likely diagnosis?

Accepted Answer

Syndrome of inappropriate antidiuretic hormone secretion (SIADH)

Answer

Hypovolaemic hyponatraemia from gastrointestinal losses

Answer

Hypervolaemic hyponatraemia due to heart failure

Answer

Pseudohyponatraemia due to hyperlipidaemia

Answer

Primary polydipsia

ca-mccqe1 MCQ (SBA): SIADH