Quadratus lumborum block; after the patient was lying in the lateral decubitus position and skin asepsis of the posterior abdominal wall was provided with 10% polyvinylpyrrolidone-iodine, the ultrasound probe was moved from the level of the iliac crest to the 4th lumbar vertebra and the quadratus lumborum muscle was visualized on the transverse process of the 4th lumbar vertebra at the point where the anterior abdominal wall muscles end. The needle was advanced in-plane between the quadratus lumborum muscle and the erector spinae-latissimus dorsi muscles (QLB2) located on the posterior-superior side of this muscle, and 0.15 ml/kg 0.25% bupivacaine was injected under the thoracolumbar fascia located between these two muscles. Then, the needle was advanced towards the quadratus lumborum and the psoas major (QLB3) muscle located on the anterior-inferior side, and 0.15 ml/kg 0.25% bupivacaine was injected between these two muscles.This procedure was applied to the patient bilaterally.

Transversus abdominis plane block was performed with the patient lying in the supine position via an oblique subcostal approach from the anterior abdominal wall. After skin asepsis of the anterior abdominal wall was provided with 10% polyvinylpyrrolidone-iodine, the linear ultrasound probe was placed parallel to the subcostal border at the level of the xiphoid bone and the subcutaneous fat tissue, rectus abdominis muscle and transversus abdominis muscle were visualized, respectively. A 10 cm 20G needle (BRAUN Stimuplex Ultra 360, GERMANY) was advanced towards the transversus abdominis muscle fascia with the in-plane technique and 0.3 ml/kg 0.25% bupivacaine was injected into this area.This procedure was performed bilaterally.

Transversus abdominis plane block was performed with the patient lying in the supine position via an oblique subcostal approach from the anterior abdominal wall. After skin asepsis of the anterior abdominal wall was provided with 10% polyvinylpyrrolidone-iodine, the linear ultrasound probe was placed parallel to the subcostal border at the level of the xiphoid bone and the subcutaneous fat tissue, rectus abdominis muscle and transversus abdominis muscle were visualized, respectively. A 10 cm 20G needle (BRAUN Stimuplex Ultra 360, GERMANY) was advanced towards the transversus abdominis muscle fascia with the in-plane technique and 0.3 ml/kg 0.25% bupivacaine was injected into this area.This procedure was performed bilaterally.

All patients were extubated after the block was performed. All patients were given 1 mg bolus 10 min lock time IV morphine (Morphine Hydrochloride, OSEL Drug) connected to the PCA device (BodyGuard 575i Pain Manager, TARMED). If the morphine given with the PCA device was not sufficient as an analgesic, patients were given 1 gr IV paracetamol infusion (the dose was adjusted so that the paracetamol dose did not exceed a maximum of 4 grams per day). If the VAS was still >4 at 1 hour after paracetamol, the patient was administered 50 mg IV dexketoprofen (NSAID) (the dexketoprofen dose was adjusted to a maximum of 150 milligrams per day).he amount of opioids used and requested by the patients was recorded as the amount of PCA medication at the 15th minute, 2nd, 4th, 8th, 12th, 16th and 24th hours, as how much opioids they requested or used at the specified time intervals. For example, the amount of opioid used between the 15th minute and the 2nd hour was recorded at the 2nd hour.