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Cognitive Ergonomics and Informatory Load in Anesthesia

The anesthesia workplace can be regarded as a complex human-machine-system (HMS). In this information-intensive “cockpit” the operator has to handle several devices. Not only visual but also auditory cues have to be integrated in the action-control-loop. It ́s obvious that in some stressful and complex situations, a perceptual and cognitive overloading of the anesthetist could occur and therefor inhibit an efficient and save interaction. The design of the interfaces and the form of information presentation has a significant impact on these aspects. The contribution presents the possibilities of the new methodical approach “iFlow Analysis” (information-flow) to observe cognitive ergonomics and informatory load in such HMS. In our exemplary observation we used an eyetrackingsystem to evaluate the user interactions in a simulated scenario and in a field (thyroidectomy and exploratory laparotomy) situation. All incoming visual and auditory signals were observed during the procedure of anesthetic guidance. The interactions have been integrated in the so called iFlow Chart to evaluate the density of information presentation. In addition informatory load has been measured by the dynamic changes of pupil size.