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Patient visibility and ICU mortality: a conceptual replication.

Yi Lu1, Michelle M Ossmann, David E Leaf

  • 1CORRESPONDING AUTHOR: Yi Lu, PhD, Division of Building Science and Technology, City University of Hong Kong; Yi.Lu@cityu.edu.hk; (+852) 3442-7615.

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Summary

Objective visibility measures in intensive care units (ICUs) reveal subtle differences in patient room visibility impact clinical outcomes. Enhanced analysis shows field of view significantly predicts mortality in critically ill patients.

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Area of Science:

  • Critical care medicine
  • Healthcare facility design
  • Patient outcomes research

Background:

  • Previous studies linked vague patient room visibility to healthcare outcomes.
  • Leaf et al. (2010) first associated patient mortality with room visibility, but lacked precise measures.
  • The concept of 'visibility' in healthcare settings requires objective definition.

Purpose of the Study:

  • To reanalyze the relationship between intensive care unit (ICU) design and patient mortality using objective visibility metrics.
  • To develop and apply precise, computer-based measures of patient room visibility.
  • To investigate the impact of specific visibility parameters on mortality rates in critically ill patients.

Main Methods:

  • Reanalysis of a dataset of 664 patients across 12 medical ICU rooms.
  • Utilized computer-based visibility measures: patient head visibility, patient room visibility, and field of view to the nursing station.
  • Defined visibility metrics based on the percentage of area visible from the nursing station and viewing angles.

Main Results:

  • Field of view explained 33.5% of the variance in ICU mortality for the sickest patients (APACHE II > 30).
  • A statistically significant association (p = 0.049) was found between field of view and mortality in this subgroup.
  • Objective visibility measures provided quantifiable insights into patient outcomes.

Conclusions:

  • Precise, objective measures of patient room visibility are crucial for understanding clinical outcomes.
  • Even minor variations in ICU room visibility can significantly influence patient mortality.
  • This study underscores the importance of incorporating objective design metrics in critical care environments.