Fig. 2. Intraoperative mean arterial pressure is decreased in patients who underwent a lumbar plexus block (plexus). Values are mean ± SD. On time scale, B refers to baseline mean arterial pressure recorded before induction of anesthesia, and 0 marks the beginning of surgery. *P ≤ 0.005 for differences between groups; #P = 0.01; and +P = 0.03.