Effects of a standardized distraction on caregivers’ perceptive performance with avatar-based and conventional patient monitoring: a multicenter comparative study


Patient monitoring requires constant attention and may be particularly vulnerable to distractions, which frequently occur during perioperative work. In this study, we compared anesthesia providers’ perceptive performance and perceived workload under distraction for conventional and avatar-based monitoring, a situation awareness-based technology that displays patient status as an animated patient model. In this prospective, multicenter study with a within-subject design, 38 participants evaluated scenarios of 3- and 10-s durations using conventional and avatar-based monitoring, under standardized distraction in the form of a simple calculation task. We quantified perceptual performance as the number of vital signs correctly remembered out of the total of 11 vital signs shown. We quantified perceived workload using the National Aeronautics and Space Administration Task Load Index score. Anesthesia providers remembered more vital signs under distraction using the avatar monitoring technology in the 3-s scenario: 6 (interquartile range [IQR] 5–7) vs. 3 (IQR 2–4), p < 0.001, mean of differences (MoD): 3 (95% confidence interval [95% CI] 1 to 4), and in the 10-s monitoring task: 6 (IQR 5–8) vs. 4 (IQR 2–7), p = 0.028, MoD: 1 (95% CI 0.2 to 3). Participants rated perceived workload lower under distraction with the avatar in the 3-s scenario: 65 (IQR 40–79) vs. 75 (IQR 51–88), p = 0.007, MoD: 9 (95% CI 3 to 15), and in the 10-s scenario: 68 (IQR 50–80) vs. 75 (IQR 65–86), p = 0.019, MoD: 10 (95% CI 2 to 18). Avatar-based monitoring improved anesthesia providers’ perceptive performance under distraction and reduced perceived workload. This technology could help to improve caregivers’ situation awareness, especially in high-workload situations.

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CO2 :

Carbon dioxide


Paced auditory serial additions test


National Aeronautics and Space Administration


Task Load Index


Mean of differences

95% CI:

95% Confidence interval


Interquartile range


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Institute of Anesthesiology, University, and University Hospital Zurich: institutional funding. Institute of Anesthesiology and Pain Therapy, Cantonal Hospital Winterthur: institutional funding. University of Zurich: Proof of concept funding (UZ16/288POC). University of Zurich: DWT career development grant.

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JP: helped design the study, collect the data, analyze the data, write the article and approved the final version. MTG: helped collect the data, write the article and approved the final version. DRS: helped design the study, write the article and approved the final version. CBN: helped design the study, collect the data, analyze the data, write the article and approved the final version. DWT: helped design the study, collect the data, analyze the data, write the article and approved the final version.

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Correspondence to David W. Tscholl.

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The University of Zurich and Koninklijke Philips N.V., Amsterdam entered a joint development and licensing agreement to develop an avatar-based product. As part of this agreement, the authors DWT and CBN may receive royalties.

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Pfarr, J., Ganter, M.T., Spahn, D.R. et al. Effects of a standardized distraction on caregivers’ perceptive performance with avatar-based and conventional patient monitoring: a multicenter comparative study. J Clin Monit Comput 34, 1369–1378 (2020). https://doi.org/10.1007/s10877-019-00429-2

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  • Situation awareness
  • Patient monitoring
  • Computer-assisted diagnosis
  • Visual patient