Table-I.

Changes in level of magnesium, calcium, potassium and sodium of serum over the time.

	Measuring time
	before operation	1th hour after operation	2edday after operation	3rdday after operation	P value
Mg	2.30±0.57	2.25±0.80	1.82±0.34	1.83±0.33	P<0.001
Cal	9.67±0.92	7.92±1.03	8.77±0.83	8.86±0.69	P<0.001
K	4.57±0.66	4.19±0.38	4.34±0.48	4.18±0.28	P<0.001
Na	139.12±9.54	138.35±10.01	136.47±3.53	135.53±2.72	P<0.001