In adults with a major burn, maintenance fluid should be given in addition to resuscitation fluids. This replaces any potential evaporative losses and metabolic requirements. Typically, the volume is 2-2.5 litres per day for a fit, young adult. However, this volume must be modified according to the likely physiological reserves of the patient and constant clinical monitoring.
The replacement fluid is normal saline with potassium. However, large burns can release and elevate blood potassium and so again, regular potassium assay is mandatory.
Any supplementary fluid losses, e.g. vomitus, nasogastric aspirate, must be replaced volume-for-volume with fluid of a similar composition.
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