Hemi-diaphragmatic Paresis and Erector Spinae Plane Block

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)