Systems Design Engineering

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This is the collection for the University of Waterloo's Department of Systems Design Engineering.

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Browsing Systems Design Engineering by Author "Schaef, Laura Kathleen"

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    Ecological Interface Design in Neuro-Critical Care
    (University of Waterloo, 2023-05-02) Schaef, Laura Kathleen
    Neuro-critical care is a data-intensive environment that requires physicians to integrate information across multiple screens, sources, and software. Despite the advances in neuromonitoring techniques, interfaces that allow for viewing and analyzing of historic data are not common. However, historical data is critical to identify patterns important for patient care. Instead, physicians view the trends of a patient’s neurophysiological variables by continuously watching the bedside monitor or they rely on checking the paper (or digital) charts for a patient where variables have been recorded periodically (usually once an hour). In neuro-critical care, physicians need to understand the historic and current state as well as predict the future state of intracranial pressure (ICP). ICP is the most monitored brain-specific physiologic variable in the Intensive Care Unit (ICU) and is considered a biomarker for secondary brain injury. As a result, ICP would benefit greatly from showing key patterns important to patient state and care. The ICU is a stressful, dynamic, and time-sensitive environment where the performance of physicians and their ability to correctly diagnose and manage patient treatment has a significant impact on patient outcomes. Physicians rely on the bedside physiologic monitor to detect changes in physiologic variables. The monitor must provide the information required to understand the patient’s condition so physicians can determine the optimal treatment plan. With the high cognitive demands and complex sociotechnical environment of the ICU, an opportunity exists for improved neuro-critical care monitoring to support physicians’ decision-making. Ecological Interface Design (EID) is an approach to interface design that has proven effective for complex, sociotechnical, real-time, and dynamic systems. Research suggests that an EID approach combined with user-centered design has a positive impact on performance, especially in unfamiliar scenarios. The objective of this research is to explore an EID design approach combined with user-centered design to enhance the bedside physiologic monitor through the addition of visualizations that help support physicians' understanding of complex relationships and concepts in neuro-critical care. The hope is that providing more-advanced visualizations on the bedside physiologic monitor will lead to improved situation awareness, decreased mental workload, and expertise development acceleration of novice clinicians in the neuro-ICU. The work presented in this thesis builds on the Cognitive Work Analysis (CWA) and observations in the ICU already completed by Uereten et al (2020). The design of the visualizations for use on the bedside physiologic monitor was highly iterative and involved the inputs from the CWA and observations as well as ongoing feedback and focus areas provided by Dr. Victoria McCredie, our clinical collaborator and critical care physician at Toronto Western Hospital. The visualizations were evaluated and validated in semi-structured interviews with trainees (fellows) and experts (staff physicians) in neuro-critical care. The semi-structured interviews with trainees were used as a preliminary usability assessment of the visualizations and the interviews with staff physicians were used to iterate and refine the designs. The results from both sets of interviews were used to create a final design prototype that is currently being tested in a usability study with trainee physicians (January-March 2023).