Interscalene Block Versus Infraclavicular Block Plus Suprascapular Nerve Block

Despite their reliability and efficacy for shoulder surgery analgesia, above clavicle brachial plexus blocks are related with phrenic nerve palsy and diaphragm paralysis that may not be tolerated in patients with chronic pulmonary disease. This RCT will compare the classic Interscalene block with combined infraclavicular block plus suprascapular nerve block in patients going for arthroscopic shoulder surgery. Main outcome is static pain in the recovery room measured with NRS. Secondary outcomes are pain at 12 and 24 hrs and incidence of diaphragmatic paralysis.