Selective Trunk Block: A Study to Evaluate Block Dynamics, Effects and Efficacy for Upper Limb Surgery

It is one type of peripheral nerve blocks for upper extremity surgery. In this study, the block will be done under the ultrasound guidance and the local anesthetic agent (a mixture of 2% Xylocaine with 1:200,000 adrenaline and 0.5% Chirocaine in a total of 25ml) will be injected at the trunks of the brachial plexus in order to produce the surgical anesthesia of the whole upper extremity of the patients scheduled for upper limb surgeries.