The primary cardiac electrophysiologic effect of local anaesthetic agent is a decrease in the maximum rate of depolarization in the purkinjefibres and ventricular muscle. This is due to decrease in the availability of sodium channels. Bupivacaine decreases cardiac output by decreasing sympathetic tone, heart rate and venous return. It also decreases central venous pressure. Patients of age 6-12yrs, undergoing upper limb surgeries under Supraclavicular block with ASA-1 status were included in study. Patients with drug allergy or upper respiratory tract infections were excluded. Patients were randomly assigned into 2groups, Group SI and TI with 50 patients each. Study was carried out to assess success rate of block achieved based on changes in hemodynamic parameters. There was no statistical difference in hemodynamic variables seen in both groups. There were no complications seen.