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Validation of respiratory mechanics software in microprocessor-controlled ventilators
R J Korst1, R Orlando, N S Yeston
1Department of Surgery, Hartford Hospital, CT 06115.
Critical Care Medicine
|August 11, 1992
Summary
This study validates ventilator software for measuring airway resistance and lung compliance. The automated measurements closely correlate with manual calculations, suggesting clinical utility for monitoring patient response during mechanical ventilation.
Area of Science:
- Respiratory Mechanics
- Medical Device Technology
- Clinical Engineering
Background:
- Microprocessor-controlled ventilators often include software for real-time airway resistance and lung compliance measurements.
- The clinical validity of these automated measurements requires thorough investigation.
Purpose of the Study:
- To assess the accuracy of airway resistance and lung compliance measurements from software packages on three different microprocessor-controlled ventilators.
- To compare automated ventilator-derived values against manually calculated parameters.
Main Methods:
- An artificial lung-patient circuit was established using a test lung and endotracheal tube.
- Airway pressure and flow data were collected, and manual calculations of static lung compliance and airway resistance were performed.
- Automated measurements were obtained from three ventilator models (Puritan-Bennett 7200a, Bear 5, Veolar) with varied clinical parameters.
Main Results:
- High correlation coefficients were observed between automated and manual measurements for both airway resistance (r² = 0.94–0.98) and lung compliance (r² = 0.93–0.97) across all tested ventilators.
- While not in absolute agreement, the differences between automated and manual values were ventilator-specific and predictable.
Conclusions:
- The respiratory mechanics software packages demonstrate strong correlation and agreement with manual methods, indicating potential clinical utility for trend monitoring and treatment response assessment.
- These findings are specific to controlled mechanical ventilation modes; further validation is needed for spontaneous breathing modes.
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