Bilateral Ultrasound Guided ESP Block Versus TAP Block on Post-operative Analgesia After Total Abdominal Hysterectomy

In the lateral position, after skin sterilization, erector spinae plane block will be performed at the level of T9. Counting down from the spine of seventh cervical vertebrae, the spine of the nine thoracic vertebrae (T9). A linear low frequency ultrasound transducer (US) (3-5 MHz) will placed sagittal 3cm lateral to midline to visualize the muscles of the back, transverse process and simmering pleura in between transverse processes. A 22-gauge short bevel needle will be inserted in cranial-caudal direction towards transverse process (TP) in plane to the US transducer until needle touched the TP crossing all the muscles. The location of the needle tip will be confirmed by visible normal saline fluid separating erector spinae muscle off the bony shadow of the transverse process on ultrasound imaging. Then 20 ml of bupivacaine 0.375% plus plus 5ug/ml adrenaline (1:200000) will be injected. The procedure will be repeated following the same steps on the other side of the back.

in supine position and after skin sterilization. The linear high frequency transducer (6-13 MHz) will be placed in the transverse plane to the the lateral abdominal wall in the midaxillary line, between the lower costal margin and iliac crest. The three abdominal wall muscles (external oblique, internal oblique, and transversus abdominis) are visualized. The needle inserted in plane and advanced anterior to posterior under continual visualization until the tip between the internal oblique and the transversus abdominis muscle. After negative aspiration, a 20 ml of bupivacaine 0.375% plus 5ug/ml adrenaline (1:200000) will be injected. The success of the injection will be confirmed by separation of the internal oblique and transversus abdominis with a distinct pocket of local anesthetic in between. The procedure will be repeated following the same steps on the other side.