Erector Spina Plane Block Volume Comparison

ESP block is a method used to provide postoperative analgesia by injecting local anesthetic between the erector spinae muscle and the transverse process of the vertebra under ultrasound guidance, targeting the dorsal and ventral rami of thoracic and abdominal spinal nerves. The aim of this randomized controlled study is to observe whether there is a difference in tramadol consumption within 24 hours after surgery between patients who undergo RIRS operations at T11 level with different volumes of ESP blocks performed under ultrasound guidance before general anesthesia induction.