• Hilde Strand, Ann Charlott Elshaug, Øyvind Bernersen, and Randi Ballangrud.
• Department of Anesthesiology, Innlandet Hospital Trust, Sykehuset Lillehammer, Anders Sandvigs gate 17, 2609, Lillehammer, Norway. hilde.strand@sykehuset-innlandet.no.
• BMC Anesthesiol. 2022 Feb 28; 22 (1): 57.

BackgroundAssessment of appropriate anesthetic depth is crucial to prevent harm to patients. Unnecessary deep anesthesia can be harmful, potentially causing acute renal failure, myocardial injury, delirium, and an increased mortality rate. Conversely, too light anesthesia combined with muscle relaxants can result in intraoperative patient awareness and lead to serious psychological trauma. This trial aimed to ascertain the effectiveness of the advisory display SmartPilot® View (SPV), as a supplemental measure in the assessment of anesthetic depth in low risk gynecological surgery patients. The hypothesis was that the use of the SPV would increase the precision of assessment, and result in a higher mean arterial pressure.MethodsThis trial used a randomized, controlled, single-blind design with a homogeneous sample. Patients undergoing minor, low risk gynecological surgery were randomly assigned to two groups: a test group wherein current standards were supplemented with the advisory display SPV and a control group assessed using only the current standards. Female patients aged between 18 and 75 years with American Society of Anesthesiologists Physical Status Classification System scores of 1-3 undergoing planned general anesthesia using the total intravenous anesthetic method, combining propofol and remifentanil, were included. The exclusion criteria included a body mass index ≥ 35 kg/m2, a history of alcoholism, drug intake affecting propofol and remifentanil dynamics, and inability to consent. The independent sample t-test and chi-square test or Fisher's exact test were used to assess the statistical significance of differences between the two groups.ResultsA total of 114 patients were included in the analysis (test group n = 58, control group n = 56). No significant differences in the mean arterial pressure, heart rate, bispectral index, extubation delay, or post-anesthesia care unit stay were found between groups.ConclusionsThe addition of the advisory display SmartPilot® View to current standards in the evaluation of anesthetic depth had no significant effect on the outcome.Trial RegistrationThe trial was registered on January 16th 2019 with ClinicalTrials.gov (ref: NCT03807271 ).© 2022. The Author(s).

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