Laparoscopic cholecystectomy surgeries cause moderate/severe pain and thus can result in shallow breathing, atelectasis and increased opioid consumption in the early postoperative period which in turn cause a longer hospital stay. Erector spinae plane block has been shown to decrease lower thoracic pain after laparoscopic cholecystectomy surgeries. This study aims to investigate the effect of erector spinae plane block on opioid consumption and diaphragma movement after laparoscopic cholecystectomy surgeries.

Inclusion Criteria:

• Ages between 18 and 65
• Patients in American Society of Anesthesiologists Classification I or II
• Elective laparoscopic cholecystectomy surgery performed under general anesthesia

Exclusion Criteria:

• Patient refusal
• Patients who can not provide informed consent or with a known psychiatric disease
• Patients with a known allergy to study drugs
• Patients using anticoagulants and corticosteroids
• Patients with diaphragma hernia, chronic obstructive pulmonary disease, lung cancer
• Patients who are not able to use a patient controlled analgesia device