0.9% sodium chloride is principal 1st line fluid of choice
Regular monitoring of osmolality to prevent rapid osmotic shifts (JBDS guidance recommends 1hrly osmolality measurements for the 1st 6hrs, then 2hrly measurements if there is a satisfactory response (a fall of 3-8 mosmol/kg/hr)).
Serum sodium change should not exceed 10mmol/24hrs (aim for 3-8mmo)