Different Local Anesthetic Volumes in Brachial Plexus Block

This prospective randomized study will be carried out on 75 patients in our university hospitals presented for shoulder arthroscopy under general anesthesia and ultrasound-guided interscalene brachial plexus block. All the patients will receive ultrasound-guided interscalene brachial plexus block with injection of local anesthetic volume according to the group of the patient * Group I (25 patients): patients will receive 5 ml levobupivacaine 0.25% ISPB * Group II (25 patients): patients will receive 10 ml levobupivacaine 0.25% ISPB * Group III (25 patients): patients will receive 15 ml levobupivacaine 0.25% ISPB After ensuring adequate sensory and motor blockade, general anesthesia will be carried out. The primary outcome measurement will be the incidence of diaphragmatic hemiparesis 30 minutes after performing the block detected by US assessment of diaphragmatic excursion and the secondary outcome will be the postoperative pain scores and opioid consumption.