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Continuous Non-Invasive Eye Tracking In Intensive Care.

Ahmed Al-Hindawi, Marcela P Vizcaychipi, Yiannis Demiris

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 11, 2021
    PubMed
    Summary

    Diagnosing delirium in intensive care units (ICUs) is crucial. A new, non-invasive eye-tracking system was developed and tested, showing high accuracy and ease of use for monitoring this acute confusional state.

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    Area of Science:

    • Medical Technology
    • Intensive Care Medicine
    • Ophthalmology

    Background:

    • Delirium is a frequent and serious complication in Intensive Care Units (ICUs), associated with poorer patient outcomes.
    • Current diagnostic methods for delirium have limitations, necessitating novel approaches.
    • Eye-tracking has been proposed as a potential tool for diagnosing delirium by assessing inattention.

    Purpose of the Study:

    • To define the requirements for an eye-tracking system suitable for adult ICU environments.
    • To develop and evaluate a non-invasive, calibration-free eye-tracking system for delirium monitoring.
    • To assess the feasibility and acceptability of the developed system in a clinical setting.

    Main Methods:

    • Measurements were conducted at Chelsea & Westminster Hospital NHS Foundation Trust to establish system requirements.

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  • A non-invasive eye-tracking system was engineered using patient-facing RGB and scene-facing RGBD cameras.
  • System performance was validated in a laboratory setting with healthy volunteers and subsequently in a clinical feasibility study (CONfuSED) with 5 patients.

    • Main Results:

    • The developed eye-tracking system demonstrated accuracy and precision exceeding clinical requirements.
    • The system proved to be non-invasive and calibration-free, simplifying its application.
    • Aggregated data from 5 patients in the CONfuSED study were collected, and the system's acceptability to nursing staff was assessed.

    Conclusions:

    • The developed eye-tracking system is the first of its kind deployed in an ICU for delirium monitoring.
    • The system shows promise as an accurate, non-invasive, and user-friendly tool for detecting delirium.
    • Further clinical studies are warranted to confirm the utility of this technology in improving delirium diagnosis and patient outcomes.