Inclusion Criteria:  18 - 85 years American Society of Anesthesiology (ASA) I-III elective shoulder surgery  Exclusion Criteria:  patient's refusal under 18 years of age or over 65 years of age ASA IV and above known allergy to local anaesthetic drugs the block cannot be applied due to bleeding disorders or localized skin infection at the injection site history of neurological and/or neuromucular disease history of severe bronchopulmonary disease a moderate to severe decrease in preoperative pulmonary function, or abnormality in preoperative chest radiography data (pleural effusion, pneumothorax, or hemidiaphragm elevation)