An mTLIP Block for Analgesia Management After Lumbar Spinal Surgery.

In group T, the block was performed bilaterally under aseptic conditions using the US device with a high-frequency 12-MHz linear US probe. The probe was covered with a sterile sheath and placed vertically at the L3 vertebrae level. After visualizing the hyperechoic shadow of the spinous process and interspinous muscles as an anatomical guide point, the probe was moved forward in a lateral direction to visualize the longissimus and iliocostal muscles. Using the in-plane technique, a 22-G, 50-mm block needle was inserted between the muscles in a medial-to-lateral direction in the interfascial plane. Once the needle tip was placed within the interfacial plane and after careful aspiration to rule out intravascular needle placement, 2 ml of saline was injected to confirm the accuracy of the injection site. A dose of 0.25% bupivacaine (20 ml) was then injected in each side (total 40 ml).

In group W, a dose of 0.5% bupivacaine (20 ml) was injected for wound infiltration into the surgery site.