A 60-year-old man with chronic hyponatraemia (Na 120 mmol/L) due to syndrome of inappropriate antidiuretic hormone secretion (SIADH) from small-cell lung cancer is otherwise asymptomatic. What is the most appropriate initial management?ARapid correction with hypertonic saline aiming for Na 140 mmol/L in 24 hoursBFluid restriction and treatment of the underlying causeCNo treatment because he is asymptomaticDHigh-dose loop diuretics aloneEGive desmopressin to further concentrate urineCheck my answer