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The effects of ventilator working pressure during pressure support ventilation
I L Cohen1, Z Bilen, S Krishnamurthy
1Department of Surgery, Albany Medical College, New York 12208.
Chest
|February 1, 1993
Summary
Altering ventilator working pressure significantly impacts airway pressure and flow during pressure support ventilation (PSV). Individualizing working pressure is crucial for optimal patient-ventilator interaction and lung mechanics.
Area of Science:
- Mechanical Ventilation
- Respiratory Physiology
Background:
- Pressure support ventilation (PSV) is a common mode of mechanical ventilation.
- Understanding lung-ventilator interaction is critical for patient outcomes.
Purpose of the Study:
- To investigate how changes in ventilator working pressure affect airway pressure and flow dynamics during PSV.
- To quantify the impact of working pressure on lung-ventilator interaction.
Main Methods:
- Utilized a Siemens Servo 900C ventilator and a single lung simulator.
- Collected graphic readouts at various settings of PSV, working pressure, compliance, and resistance.
- Performed multiple regression analyses to determine the influence of independent variables on dependent variables.
Main Results:
- Working pressure's impact on airway pressure and flow varies with lung and airway characteristics.
- Excessive working pressure led to increased flow rates, circuit overshoot, reduced tidal volume, inspiratory time, and airway pressure curve area.
Conclusions:
- Ventilator working pressure significantly and quantifiably affects lung-ventilator interaction.
- Individualizing working pressure and initial flow rate is essential for optimizing airway mechanics and patient ventilation.