Table 2.

Changes in serum total and ionised calcium, magnesium and phosphate

	T1	T2	T3	T4	T5
Total calcium (mmol/L)	2.2 ± 0.1	1.9 ± 0.1*	2.1 ± 0.2*	2.1 ± 0.1*	2.3 ± 0.1*
i[Ca] (mmol/L)	1.1 ± 0.1	0.9 ± 0.1*	1.1 ± 0.1	1.1 ± 0.1	1.2 ± 0.04
Mg++ (mmol/L)	1.1 ± 0.4	1.3 ± 0.4	1.3 ± 0.2	1.1 ± 0.2	0.9 ± 0.1*
PO43- (mmol/L)	1.1 ± 0.2	0.9 ± 0.2*	1.0 ± 0.2*	1.2 ± 0.3	1.1 ± 0.3

*Significantly different from baseline (P < 0.01).T1 - baseline, T2 - five minutes after onset of cardiopulmonary bypass (CPB) (time of maximal fluid effect), T3 - on return to the intensive care unit, T4 - 24 hrs after surgery, T5 - five days after surgery.