Computer simulation allows goal-oriented mechanical ventilation in acute respiratory distress syndrome

Area of Science:

• Critical Care Medicine
• Respiratory Physiology
• Biomedical Engineering

Background:

• Acute respiratory distress syndrome (ARDS) necessitates lung-protective ventilation strategies to prevent further damage.
• Strategies include low tidal volume (VT), moderate positive end-expiratory pressure, and low airway pressure.
• Aspiration of dead space (ASPIDS) is a technique to reduce VT by eliminating tracheal dead space.

Purpose of the Study:

• To investigate the efficacy of goal-oriented mechanical ventilation guided by computer simulation in reducing VT in ARDS.
• To assess if VT can be significantly reduced using high respiratory rates and ASPIDS without compromising gas exchange or increasing airway pressure.

Main Methods:

• ARDS was induced in pigs via surfactant perturbation and ventilator-induced lung injury.
• Ventilator settings were adjusted using computer simulation, targeting minimal VT, plateau pressure of 30 cmH2O, and isocapnia.
• Ventilation was optimized first by increasing respiratory rate, then by incorporating ASPIDS.

Main Results:

• VT was reduced from 7.2 ml/kg to 6.6 ml/kg with increased respiratory rate and further to 4.0 ml/kg with ASPIDS.
• Arterial carbon dioxide tension remained close to predicted values throughout the study.
• Positive end-expiratory pressure and plateau pressures were managed effectively, being slightly higher without ASPIDS and lower with ASPIDS than predicted.

Conclusions:

• Computer simulation shows potential for guiding goal-oriented ventilation in ARDS patients.
• Further research is required to evaluate the long-term benefits and limitations of this approach.