Enhancing postoperative pain control by surgically-initiated rectus sheath block in abdominal aortic aneurysm open repair: A case report

Figure 4 Rectus sheath block technique: A detailed cross-sectional diagram of the abdominal wall illustrating the technique for rectus sheath block. A: The needle target; B: The transverse section of the anterior abdominal wall depicting needle position and local anesthetic injection; C: The placement of the rectus sheath catheter; D: The catheter-over-needle assembly being inserted in a cephalad-to-caudad direction, with intra-abdominal hand placement to feel for needle advancement.