Comparison Between Erector Spinae Plane Block and Spinal as Surgical Anesthesia and Analgesia in Percutaneous Nephrolithotomy Patient : Conversion to General Anesthesia, Interleukin-6, Postoperative Pain and Opioid Consumption

Thirty subjects (who meet all inclusion criteria and do not have exclusion criteria) are given informed consent before enrolling the study and randomized into two groups: erector spinae plane block and spinal. Non-invasive blood pressure monitor, electrocardiogram (ECG), and pulse-oxymetry will be set on the subjects in the operation room. Peripheral venous blood samples will be taken for IL-6 examination. All patients will be sedated using Target Controlled Infusion with propofol (Schnider model, effect site) to obtain mild-moderate sedation prior to the block. On Erector Spinae Plane group, single-shot ultrasound guided block will be performed on the operated side with stimuplex 100 mm needle and 25 ml of isobaric bupivacaine 0.5% with epinephrine 1:200.000 will be administered at level Th 9. On the Spinal group, spinal anesthesia will be performed on lateral decubitus position at the level of L3-L4 or L4-L5 and hyperbaric bupivacaine 0.5% 16-18 mg will be given as regimen. Prior to urethral manipulation, all subjects will be given fentanyl iv 50 mcg and sedation with TCI Propofol will be maintained throughout the procedure. Sensory loss was evaluated by performing skin clamping with a scalpel at the level of the incision before the surgery. The ESP block was considered successful in providing surgical anaesthesia when there was no movement and significant changes in vital signs during skin clamping and throughout the surgery.