Compare the average Cl - blood levels before, during and after surgery in the two groups Time Blood Cl - level (mmol / l) (SD) p Group 1 (3% sorbitol) Group 2 (0.9% NaCl) n Blood Cl - level n Blood Cl - level t0 50 107.24±2.70 50 106.4±2.81 >0.05 t1 50 107.04±3.26 50 106.9±3.22 >0.05 t2 33 106.42±3.05 34 109±3.16 <0.05 t3 15 106.6±2.06 15 111.67±2.02 <0.05 t4 8 106±2.20 10 113.7±2.95 <0.05 t5 3 105.5±0.71 1 109 <0.05 t6 50 106.88±2.70 50 112.78±3.24 <0.05 t7 50 107.78±3.13 50 109.88±3.22 >0.05 Pbefore - after (to-t6) >0.05 <0.001 The mean concentration of blood chlorine ions before, during and after surgery was significantly different in group 2 (p <0.001); the comparison between the two groups also differed significantly (p <0.05).