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An adaptive lung ventilation controller

T P Laubscher1, W Heinrichs, N Weiler

  • 1Hamilton Bonaduz AG, Switzerland.

IEEE Transactions on Bio-Medical Engineering
|January 1, 1994
PubMed
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Adaptive Lung Ventilation (ALV) offers closed-loop control for mechanical ventilation, adjusting settings based on patient lung mechanics. This new approach improves ventilation control for both paralyzed and spontaneously breathing patients.

Area of Science:

  • Mechanical Ventilation
  • Pulmonary Physiology
  • Control Systems Engineering

Background:

  • Traditional closed-loop ventilation control relies on CO2 levels, neglecting patient-specific factors like size and lung mechanics.
  • Existing ventilation modes are often unsuitable for spontaneously breathing individuals.

Purpose of the Study:

  • Introduce and evaluate Adaptive Lung Ventilation (ALV), a novel pressure-controlled ventilation approach.
  • Assess ALV's ability to achieve target alveolar ventilation by adjusting mechanical rate and inspiratory pressure.
  • Validate ALV's performance across various lung pathologies and in clinical settings.

Main Methods:

  • ALV utilizes patient lung mechanics and dead space measurements for automatic control adjustments.
  • The controller was tested on a physical lung model simulating restrictive, normal, and obstructive lung diseases.

Related Experiment Videos

  • Feasibility was assessed in six patients under total intravenous anesthesia during surgical procedures.

    • Main Results:

    • The ALV controller demonstrated response times between 48 and 81 seconds in model studies.
    • Overshoot was observed between 5.5% and 7.9% of the setpoint following step changes.
    • Performance metrics like rise time, overshoot, and steady-state error were evaluated across simulated lung conditions.

    Conclusions:

    • Adaptive Lung Ventilation (ALV) presents a promising new method for closed-loop ventilation control.
    • ALV's ability to adapt to patient-specific lung mechanics enhances its suitability for diverse clinical scenarios.
    • Further validation is warranted, but ALV shows potential for improved patient ventilation management.