NARCOTREND index (NI) is based on studies of normal human brain electrical data. It uses an ordinary electrode to collect and analysis brain electrical signals immediately at any position of the head

to display the state of consciousness and depth of anesthesia of patients on the touch screen after automatic analysis and classification

so as to guide dose adjustment of anesthetics. NI may make the consciousness and depth of anesthesia monitoring safe

simple

accurate

and economic. It is important that NI is more accurate than classical electroencephalographic variables.1 Weber et al2 believed that the NI was an objective and true index in the evaluation of propofol sedation in children.