The Science Journal of the American Association for Respiratory Care

2009 OPEN FORUM Abstracts

EVALUATION OF A NEW GRAPHICAL INTERFACE FOR MECHANICAL VENTILATION

Rory Mullin, Shannon E. Cook, Robert L. Chatburn; Respiratory Institute, Cleveland Clinic, Cleveland,OH

BACKGROUND: Graphical interfaces are becoming more advanced with each new mechancial ventilator platform. However, accuracy and ease of use, based on ventilator graphics, are rarely studied (J Am Med Inform Assoc. 2006; 13: 635 and Resp Care. 2008; 53: 329). Hamilton Medical Inc. has developed a display that represents resistance and compliance graphically as a lung silhouette and key ventilatory parameters as a bar graph. We hypothesized that when using this newly developed ventilator display, compared to a conventional display, clinician volunteers would (1) require less time to make a diagnoses of current state, adverse event, and weaning status; (2) make diagnoses and evaluations of adverse events and weaning status more accurately, and; (3) report decreased subjective workloads while interpreting the simulated respiratory events. METHODS: The study was approved by the Cleveland Clinic Institutional Review board. Eleven clinicians participated and were asked to identify: normal, restrictive and obstructive lungs; occluded ET tube, right main stem intubation, pre spontaneous breathing trial (SBT), SBT in progress, and post-SBT. Both conventional and new graphic displays were represented using the Hamilton G5 ventilator simulation software (http://www.hamilton-medical.com/HAMILTON-G5.648.0.html). Mean values were compared with t-tests or Mann-Whitney Rank Sum tests; P < 0.05 considered significant. RESULTS: Results are shown in the Figure (bars = means, wiskers = standard deviations). There was no difference in diagnosis accuracy (58% ± 21% vs 72% ± 18% seconds) but the % correct identification of SBT was higher with the new display (P = 0.009). The time to correct diagnosis, across scenarios, was less with the new display (52 ± 19 vs 32 ± 17 seconds). There was no difference in task load index. CONCLUSIONS: Our results suggest that a larger sample size may reveal important differences in accuracy and timing of ventilation events between standard and new ventilator display options. However, even using the standard display the overall accuracy across scenarios was less than could be desired. These data may provide benchmarks for future educational initiatives and technological advancements. Sponsored Research - None

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