Evaluation of an enhanced pulse oximeter auditory display: a simulaion study

Br J Anaesth. 2020 Nov;125(5):826-834. doi: 10.1016/j.bja.2020.05.038. Epub 2020 Jul 15.

Abstract

Background: We compared anaesthetists' ability to identify haemoglobin oxygen saturation (SpO2) levels using two auditory displays: one based on a standard pulse oximeter display (varying pitch plus alarm) and the other enhanced with additional sound properties (varying pitch plus tremolo and acoustic brightness) to differentiate SpO2 ranges.

Methods: In a counter-balanced crossover study in a simulator, 20 experienced anaesthetists supervised a junior colleague (an actor) managing two airway surgery scenarios: once while using the enhanced auditory display and once while using a standard auditory display. Participants were distracted with other tasks such as paperwork and workplace interruptions, but were required to identify when SpO2 transitioned between pre-set ranges (target, low, critical) and when other vital signs transitioned out of a target range. They also identified the range once a transition had occurred. Visual displays were available for all monitored vital signs, but the numerical value for SpO2 was excluded.

Results: Participants were more accurate and faster at detecting transitions to and from the target SpO2 range when using the enhanced display (100.0%, 3.3 s) than when using the standard display plus alarm (73.2%, 27.4 s) (P<0.001 and P=0.004, respectively). They were also more accurate at identifying the SpO2 range once a transition had occurred when using the enhanced display (100.0%) than when using the standard display plus alarm (57.1%; P<0.001).

Conclusions: The enhanced auditory display helps anaesthetists judge SpO2 levels more effectively than current auditory displays and may facilitate 'eyes-free' monitoring.

Keywords: auditory perception; data display; multitasking; operating theatre; oxygen saturation; patient monitoring; patient safety; pulse oximetry; sonification.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acoustic Stimulation
  • Adult
  • Anesthesiologists
  • Clinical Alarms
  • Cross-Over Studies
  • Data Display*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Operating Rooms / organization & administration
  • Oximetry / instrumentation*
  • Oxygen / blood
  • Surveys and Questionnaires
  • Vital Signs

Substances

  • Oxygen