After the surgical procedure was completed in patients who underwent general anesthesia, the necessary sterility was provided for the ESPB procedure while the patient was in the lateral position. 1mg/kg 0.5% bupivacaine + 1mg/kg 2% lidocaine was drawn into the same syringe and the volume was completed to 20 ml with normal saline. A linear 10-18 MHz USG probe was placed at the thoracic 7 level (Esaote MyLab 30, Geneva, Italy) in the paramedian plane between two transverse processes. The prepared local anesthetic drug was administered under the guidance of USG.

For patients in the PCA group, 200 mg of tramadol was placed in 100cc of 0.9% NaCl. Set to PCA device. A 50mg loading dose was administered 10 minutes before the patient was extubated. After extubating, a bolus dose of 20 mg was started, with a 30-minute lock-in time, and an infusion dose of 5mg/hour. The 4-hour maximum limit was set to 200 mg.

In patients who underwent general anesthesia, after the surgical procedure was completed, after sterility was ensured for the ESP group while the patient was in the lateral position for the ESPB procedure, the linear 10-18 MHz USG probe (Esaote MyLab 30, Geneva, Italy) was placed between two transverse processes in the paramedian plane and increased from 1mg/kg to %1 at the T7 level. 20 ml of 0.5 bupivacaine (Buvasin®, Vem, Istanbul, Turkey) + 2% arrhythmic residual SF from 1mg/kg was administered. For patients in the PCA group, 200 mg of tramadol was placed in 100cc of 0.9% NaCl. Set to PCA device. A 50mg loading dose was administered 10 minutes before the patient was extubated. After extubating, a bolus dose of 20 mg was started, with a 30-minute lock-in time, and an infusion dose of 5mg/hour. The 4-hour maximum limit was set to 200 mg.

Visual Analog Scale score were recorded at the post operative 30 minutes, 1st, 3rd, 6th and 12th hours after the operation. High VAS score was interpreted as severe pain in patients. When the VAS score was 4 and above, additional analgesic (15 mg/kg paracetamol) was given intravenously.

When the VAS score was 4 and above, 15 mg/kg paracetamol was given intravenously. Additional analgesic drug (Paracetamol) was recorded in milligrams.

Patient satisfaction was recorded using a Likert scale at the 30th minute, 1st, 3rd, 6th and 12th hours after the operation.

Patient satisfaction was scored between 1 and 5 using a Likert scale at the 30th minute, 1st, 3rd, 6th and 12th hours postoperatively. 1 point not satisfied at all, 2 points dissatisfied, 3 points not sure, 4 points satisfied, 5 points very satisfied.

Mobilization status was checked and recorded at the 30th minute, 1st, 3rd, 6th and 12th hours after the surgery. We accepted the extubation time as the postoperative 0th hour. We determined the time when the patients started walking for the first time after the surgery accordingly.