 The loss of calcium- and magnesium-citrate in the ultra-filtrate via the hemofilter needs to be compensated to avoid systemic hypocalcemia and hypomagnesemia. Calcium replacement solution is prepared by removing 300 mls from a 1000 mls bag of 0.9 saline and subsequently adding 200 mls of 10 calcium gluconate to this bag. This calcium gluconate solution is infused via a central line at an initial infusion rate of 60 mlhr. Ionized calcium levels are monitored every 6-8 hours and corrected by changing of flow rate of the infusion. 