ecrin-mdr-crcClinical2020Colorectal cancerColorectal CancerInterventionalhttps://newmdr.ecrin.org/Study/2701154China12ECRIN MDRRecruitingfalseEfficacy and safety of low-dose ketamine combined with sufentanil for postoperative analgesia in laparoscopic radical resection of colorectal cancerInterventions: Two groups:A small dose of estroketamine was added Primary outcome(s): Pain score Study Design: Parallel2020-12-152701154ChiCTR2000040965