Comparison of the Effects of Thoracolumbar Interfascial Plane Block and Quadro Iliac Plane Block on Postoperative Opioid Consumption After Lumbar Microsurgery: A Randomized Controlled Trial

Lumbar microdiscectomy is a widely performed surgical procedure for the treatment of lumbar disc herniation. Ensuring optimal analgesia during the postoperative period is crucial for promoting functional recovery and early mobilization. Inadequate control of postoperative pain may delay the healing process, increase the risk of opioid dependence, and lead to respiratory complications.

Although opioid analgesics are effective in alleviating pain during the postoperative period, they can cause adverse effects such as nausea, vomiting, respiratory depression, and an increased risk of dependence. Therefore, the implementation of non-opioid analgesic strategies is essential for maintaining patient safety and comfort. In recent years, regional anesthesia techniques, including the Thoracolumbar Interfascial Plane block and the Quadro Iliac Plane Block, have been utilized for postoperative pain management in lumbar surgeries. However, there is insufficient evidence directly comparing the effectiveness of these two methods.

Purpose of the Study: The primary objective of this study is to evaluate the impact of ultrasound-guided Thoracolumbar Interfascial Plane and Quadro Iliac Plane Blocks on postoperative opioid consumption following lumbar microsurgery. Additionally, the secondary objective is to compare the incidence of opioid-related side effects (such as nausea, vomiting, and respiratory depression) and patients' postoperative pain scores, measured using the Numeric Rating Scale, between the two groups.