Effect of adding different doses of magnesium sulphate as adjuvant to ropivacaine on the duration of analgesia in upper limb surgeries under supraclavicular brachial plexus blockade-A Randomized controlled study

A total of 120 patients belonging to age group 18 years to 65years , ASA class I and II scheduled for upper limb orthopaedic surgeries will be prospectively studied. In this double-blinded randomized control trial, Patients will be randomly allocated into three equal study groups each containing 40 patients.  Group (A) received 24 ml of 0.5 % Ropivacaine+ 1ml Magnesium Sulphate 50 mg (control group)  **Group (B)**received 24 ml of 0.5 % Ropivacaine + 1ml Magnesium Sulphate 100 mg  Group (C) received 24 ml of 0.5% Ropivacaine +1 ml Magnesium Sulphate 150 mg

Usg guided supraclavicular brachial plexus block will be given under usg guidance before surgery

All patients will be assessed for- Onset of sensory and motor blockade, total duration of analgesia, time of first rescue analgesia, postoperative analgesic requirement, and complications due to the technique,  will be recorded.   Data collection will be done by observation and measurement of various parameters