A 70-year-old woman with chronic hyponatraemia (Na 125 mmol/L) is asymptomatic and euvolaemic. Investigations suggest syndrome of inappropriate antidiuretic hormone secretion (SIADH). What is the most appropriate initial management?ARapid correction with hypertonic saline aiming for normal sodium within 12 hoursBFluid restriction and treatment of underlying causeCHigh-dose loop diuretics and salt tablets without fluid restrictionDNo treatment is required for asymptomatic hyponatraemiaEImmediate demeclocycline therapy in all casesCheck my answer