ecrin-mdr-crcClinical2022colorectal cancerColorectal CancerInterventionalhttps://newmdr.ecrin.org/Study/2725942China2ECRIN MDRRecruitingfalseAutomated Titration Guided by Wavelet Index: A Randomized Multicenter StudyInterventions: Two groups:anesthesia surgery Primary outcome(s): the does of norepinephrine Study Design: Parallel2022-02-152725942ChiCTR2100049859