Total 87 patients were divided into 4 different dosage and try to observe what was affected to cardiovascular system depends on the increasing the plasma ionized cakium concentration (3% calcium chloride; 4 mg/kg, as its double 8 mg/kg and 10% calcium gluconate; 14 mg/kg, as its double 28 mg/kg). The results were as follows;, 1) Though using double dosage of 3% calcium chloride and 10% calcium gluconate, could not get to increase as double of plasma ionized calcium concentration. 2) Plasma ionized calcium concentration was increased to the highest level on 1 minute after intravenous administration with each dosage and after increasing to highest level was show to be decreased gradually during 30 minutes after injection. 3) Heart rate was decreased until 30 minute after injection with each dosage of 10% calcium gluconate with statistically significancy (p<0.05) but when 3% calcium chloride were used, the change of heart rate following increase of calcium concentration have not any statistically signi- ficancy. 4) When 3% calcium chloride and 10% calcium gluconate were used, mean arterial pressure (MAP) and increasing of plasma ionized calcium concentration have not any statistically signi- ficancy. 5) Changing of cardiac index (CI) following plasma ionized calcium concentration, have only statistically significancy after each dosage of 10% calcium gluconate was injected but each dosage of 3% calcium chloride have not any statistically significancy respectively. With the above results, equivalent dosage of 3% calcium chloride and 10% calcium gluconate were increased as similar change of plasma ionized calcium concentration but 10% calcium gluconate 14 mg/kg, 28 mg/kg are only have statistically significany between the change of PR, CI and increasing plasma ionized calcium concentration (p<0.05).