Laparoscopic vs Ultrasound Guided TAP Block in Colorectal Surgery. A Randomised Controlled Study.

A randomized clinical trial aiming to compare two different techniques of performing a nerve blockage of the abdominal wall. When performing surgery on the colon and rectum surgeons often use a minimal invasive technique called Laparoscopic surgery. In this technique small incisions in the abdominal wall are used to put special ports trough into the abdomen so that surgical instrument can be inserted. To minimize the pain caused by these port-holes, a so-called Transversus Abdominus Plane (TAP) nerve block is performed directly after the surgery before the patient wakes up from narcosis. This procedure is normally performed by the anesthesiologist using ultrasound to guide a needle to the right depth or "plane" in the abdominal wall where the nerves are gathered. When in the right position a local anesthetic is injected that will block the nerves and thereby anaesthetizing the abdominal wall for the first post-operative day. Recently an alternative way of guiding the needle to the right position has been presented. By using a laparoscopic camera the surgeon can easily guide the needle and inject the local anesthetics during surgery. This way of performing the TAP block may save valuable time compared to the more cumbersome ultrasound guided technique while also not needing an extra anesthesiologist in the operating theater. In this study we aim to include participants selected for elective minimal invasive surgery of the colon or rectum, where a TAP block is normally performed. The participant will be randomized to either a TAP block performed by the surgeon using laparoscopic guidance or by an anesthesiologist using ultrasound guidance. The intended surgery in itself will not be altered. During surgery we will measure TAP procedure time, total surgical time, total duration of anesthesia and total time spent in the operating theater. The following 2 postoperative days we will measure experienced pain using a validated pain-score (VAS) and measure the total consu