Hyponatraemic seizures and excessive intake of hypotonic fluids in young children

In this Lesson of the Week by P Bhalla et al (11 December, pp 1554-7), parentheses were omitted in the calculation for the dose of hypertonic saline (p 1557). The calculation should read: dose of sodium (in mmol/l): 0.6×body weight (kg)×(desired sodium concentration (125 mmol/l)−actual sodium concentration).