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DH10 - Summative Usability Assessment to verify Ergonomic Design of Ventilator Central Monitoring System UI

SessionPoster Presentations and Reception

DescriptionAccording to data from Johns Hokins Coronavirus resource center, the global pandemic of COVID-19 has resulted in 676,609,955 confirmed cases and 6,881,955 deaths as of March 10, 2023. Although the current situation is said to have improved, the world has realized the stress of causing large damage to the global medical system as enormous medical personnel and resources are invested to prevent and treat severe patients when an unexpected epidemic of infectious diseases occurs. In this situation, the need for a central monitoring system that can monitor multiple patients with ventilators was highlighted as a way to solve various problems in the process of entering patient-room, including a lack of medical personnel to continuously monitor the condition of patients. The ventilator central monitoring system is an IoT-based medical software system that can monitor and manage patients with ventilators remotely from the center. Since medical device software is closely related to human life, ensuring their safety and satisfaction is important before their actual deployment in the field. Therefore, application of ergonomic design should be confirmed through usability summative evalution. In this usability summative evaluation, a total of 21 participants, consisting of 6 respiratory physians and 15 nurses, conducted usability test according to the use scenarios in the simulated use environment. Nine use scenarios with 37 tasks were conducted to derive an average task success rate and opinions on user interface were collected through five-point Likert scale satisfaction evaluation and questionnaire. After that, based on existing studies, the threshold values of task success rate and user satisfaction for each scenario, which could indicate that it is a medical device with usability, were derived and applied to the analysis of the results. Participants conducted a total of nine use scenario tasks with an average success rate of 93% and a five-point Likert scale satisfaction survey showed a high satisfaction result of 4.7 points on average. In addition, the questionnaire suggested that overall, it is intuitive, easy to collect data, and very convenient to monitor and control ventilators centrally. Meanwhile, there were opinions about use errors and need of design improvement to increase convenience. However, at the same time, there were opinions that there would be no difficult thing if they were familiar with how to use the device. It was judged as an opinion derive because the participants used the evaluation device itself for the first time. Overall, users evaluated that the ventilator central monitoring system would be useful for effectively managing a large number of patients with ventilators. However, even medical devices with ergonomic designs that have sufficient safety and efficiency cannot guarantee absolute safety, so it is considered necessary to continuously evaluate user feedback even after introducing them to the actual site.

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Poster Presentation