Objective To investigate the effect of ultrasound-guided lumbar quadratus muscle plane block combined with general anesthesia on the analgesic effect during and after laparoscopic colon cancer radical surgery in elderly patients. Methods A prospective study was conducted on 61 elderly patients who underwent radical colon cancer surgery at the Changsha Central Hospital Affiliated to South China University from May 2022 to February 2023, with American Society of Anesthesiologist (ASA) grades II to HI. They were randomly divided into SA and GA gro...