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Case Study

Case Study. Medical Monitoring Devices Based on work done at Hewlett-Packard Patient Monitoring Division Circa 1993. Introduction. HP Patient Monitoring Division (PMD), Andover MA, 1992 – 1995

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Case Study

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  1. Case Study Medical Monitoring Devices Based on work done at Hewlett-Packard Patient Monitoring Division Circa 1993

  2. Introduction • HP Patient Monitoring Division (PMD), Andover MA, 1992 – 1995 • Division developed various devices for use in hospitals (ICU, CCU) to help improve patient outcomes • HP Medical later spun to Agilent, then sold to Philips

  3. Project “Griffin” • Develop a “next generation central station”, a monitoring device that resides at the nurse’s desk and displays data from individual bedside monitors

  4. Usability Measures • Time to learn: minimal, but training time acceptable • Speed of performance: fast, must be easy to locate critical data • Rate of errors: very low • Retention over time: high • Subjective satisfaction: not required, but good enough to maintain level of alertness over long periods of time

  5. System Users • Users are entirely clinicians: • Doctors, nurses • Highly trained professionals, high degree of area knowledge • Not necessarily computer savvy • Have critical tasks to perform, system plays an assistive role

  6. Interaction Styles • For this system, the environment drop the style as much as the users: • Minimal desk space, smaller footprint of trackball as pointing device • Potentially noisy / chaotic • Required high degree of accuracy

  7. Interaction Styles • Direct manipulation: usable for selecting targets and issuing commands (buttons) • Menu selection: short learning curve, reduced keystrokes, error handling • Forms: slow, too high a risk of errors • Command language: too much training, lots of error handling • Natural language: far too many keystrokes

  8. Monitoring Tasks • Real world object • Patients • Vital signs • Actions applied to objects • Display vital signs • Raise alarms if vitals go outside acceptable ranges • Set ranges

  9. Interface Objects • Patient • Name • Vital signs • Vital signs • Name (heart rate, blood pressure) • Value (beats per minute) • Acceptable range of value

  10. Interface Representations • Heart rate • Display metaphor: waveform • Long history in the medical community • Display color • Alarm levels • Alarm colors • Alarm sounds

  11. Interface Actions • Display vital signs • Set acceptable ranges • Inform users of alarms (visual, audio) • Silence alarms

  12. Final Interface

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