American Society of Anaesthesiologist physical status I-II, aged between 18-65, 40 patients
which underwent lumbar spinal surgery will recruited to this study. These subjects will
Ultrasound (USG) guided erector spinae block will perform at T10 level (bilaterally) to the
all patient under general anaesthesia. 15 ml bupivacaine %0.5 and 5 ml lidocaine %2 will use
for USG guided ESP block. 0.1 microgram/kg morphine will apply intravenously and diclofenac
Na 75 mg intramuscularly will apply at last 30 minutes of surgery postoperative analgesia to
all patients. Postoperative pain assessment will perform with 11-point numerical rating
scale.