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Clinical evaluation of a computer-controlled pressure support mode.
1Institut National de la Santé et de la Recherche Médicale (INSERM) U 492, Département de Physiologie, and Service de Réanimation Médicale, Hôpital Henri Mondor, AP-HP, Université Paris 12, Créteil, France.
American Journal of Respiratory and Critical Care Medicine
|April 14, 2000
Summary
A new computerized system for pressure support ventilation (PSV) significantly improved patient ventilation quality. This automatic PSV maintained target respiratory rates and tidal volumes more effectively than manual control.
Area of Science:
- Critical Care Medicine
- Biomedical Engineering
- Respiratory Physiology
Background:
- Mechanical ventilation, particularly pressure support ventilation (PSV), is crucial for respiratory support.
- Optimizing PSV levels is challenging, often leading to suboptimal ventilation parameters and increased patient workload.
- Current methods for PSV management rely on manual adjustments by clinicians, which can be time-consuming and variable.
Purpose of the Study:
- To develop and evaluate a computerized system for closed-loop, automatic control of PSV.
- To determine if automatic PSV can maintain ventilation within acceptable physiological ranges more effectively than standard physician-controlled PSV.
- To assess the impact of automatic PSV on patient workload, estimated by occlusion pressure (P(0.1)).
Main Methods:
- A novel computerized system was designed to automatically adjust PSV levels.
- The system aimed to maintain respiratory rate (RR), tidal volume (VT), and end-tidal CO2 pressure (PET(CO2)) within predefined acceptable limits.
- Ten patients underwent a crossover study comparing 24-hour periods of automatic PSV with 24-hour periods of standard physician-controlled PSV. Occlusion pressure (P(0.1)) was continuously monitored.
Main Results:
- Patients spent significantly more time with acceptable ventilation parameters under automatic PSV (93% +/- 8%) compared to standard PSV (66% +/- 24%) (p < 0.05).
- The PSV levels used were comparable between the two modes (automatic: 19 +/- 6 cm H2O; standard: 17 +/- 4 cm H2O).
- Automatic PSV significantly reduced the time spent with high workload (P(0.1) > 4 cm H2O), decreasing it to 11% +/- 17% from 34% +/- 35% during standard PSV (p < 0.01).
Conclusions:
- Computerized closed-loop control of PSV effectively improves the maintenance of target ventilation parameters.
- Automatic PSV enhances ventilation quality by increasing time within acceptable ranges and reducing periods of excessive patient respiratory effort.
- This technology shows promise for optimizing mechanical ventilation management in critical care settings.