2/19/2023 0 Comments Advanced displays![]() ![]() Continuous sound may move into focal awareness if it signals an unexpected state but recede into peripheral awareness if it signals an expected state. Auditory displays can reduce competition for the anesthesiologist's visual attention, letting him or her monitor patient vital signs in the background. 14 Most research on patient monitoring ignores the potential for auditory displays to inform rather than to alert or alarm. Whether a display is visual or auditory may have a strong impact on monitor effectiveness. 8–13 In the simulator study to be reported, we investigated advantages and disadvantages of advanced auditory displays versus HMDs for helping anesthesiologists maintain awareness of patient status and detect potentially adverse events when distracted from normal visual scanning. 2–7 Further researchers have noted that lightweight head-mounted displays (HMDs) of vital signs could also keep anesthesiologists continuously informed about the patient's state. Recognizing the unique alerting ability of the auditory modality, several researchers have suggested that the advantages of the continuous variable-tone pulse oximetry signal could be extended to other vital signs. The Anesthesia Patient Safety Foundation's alarm summit in 2004 1 emphasized that the variable-pitch pulse oximeter tone and the capnography auditory alarm must be on and audible if they are to prevent patient incidents. Further studies should test these findings in other intraoperative contexts. CONCLUSIONS:Īdvanced auditory displays help the distracted anesthesiologist maintain peripheral awareness of a simulated patient's status, whereas a HMD does not significantly improve performance. Participants self-rated monitoring as easier in the HMD, Audio and Both conditions and their responding as faster in the HMD and Both conditions than in the Visual condition. For events detected, there was no difference in detection times across display conditions. Participants detected significantly more events with Audio (mean = 90%, median = 100%, P < 0.02) and Both (mean = 92%, median = 100%, P < 0.05) but not with HMD (mean = 75%, median = 67%, ns) compared with the Visual condition (mean = 52%, median = 50%). Displays were presented in a counterbalanced order that varied across participants and included: (1) Visual (visual monitor with variable-tone pulse oximetry), (2) HMD (Visual plus HMD), (3) Audio (Visual plus auditory displays for respiratory rate, tidal volume, end-tidal CO 2, and noninvasive arterial blood pressure), and (4) Both (Visual plus HMD plus Audio). Participants completed four 22-min anesthesia scenarios. If participants detected an event that could eventually harm the simulated patient, they told the resident, pressed a button on the computer screen, and/or informed a nearby experimenter. While performing a reading-based distractor task, participants supervised the activities of a resident (an actor) who they were told was junior to them. Participants were 16 residents and attendings. In a full-scale anesthesia simulator study we examined the relative effectiveness of advanced auditory displays for respiratory and blood pressure monitoring and of head-mounted displays (HMDs) as supplements to standard intraoperative monitoring. Reprints will not be available from the author.Īddress correspondence to Penelope Sanderson, ARC Key Centre for Human Factors The University of Queensland, St Lucia, QLD 4072, Australia. The blood pressure earcons are the subject of PCT/AU2003/001622 (inventor Watson). The respiratory sonification used in this study is the subject of US Patent 7070570 (inventors Sanderson and Watson). Liu.ĭepartment and Institution to which the work should be attributed School of ITEE, School of Psychology, and School of Medicine, The University of Queensland. Russell, and by University of Adelaide to D. ![]() Supported by Australian Research Council Discovery Project grant ARC DP0559504 to P. This article has supplementary material on the Web site: Accepted for publication February 20, 2008. Lucia, Queensland †School of Medicine, The University of Queensland, St Lucia, Queensland, Australia ‡Department of Anaesthesia, Pain Medicine and Hyperbaric Medicine, Royal Adelaide Hospital, South Australia, and University of Adelaide §Royal Adelaide Hospital and University of Adelaide, Adelaide, Australia ∥School of Information Technology and Electrical Engineering, The University of Queensland, St Lucia, Queensland, Australia ♭epartment of Anaesthesia, Princess Alexandra Hospital, Brisbane, Australia and The University of Queensland #Royal Adelaide Hospital, Adelaide, Australia **Cognitive Engineering Research Group, The University of Queensland, St Lucia, Australia and ††School of Psychology, The University of Queensland, St Lucia, Australia. From the *ARC Key Centre for Human Factors and School of Medicine, The University of Queensland, St.
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