Abstract
This review provides insights into the management of mechanical ventilation during venovenous extracorporeal membrane oxygenation (VV-ECMO) for severe acute respiratory distress syndrome (ARDS). It focuses on strategies to minimize ventilator-induced lung injury (VILI) by employing ultra-lung-protective ventilation, exploring key parameters like tidal volume, plateau pressure, and driving pressure.
Key Points
- Lung Rest Strategy: VV-ECMO enables a significant reduction in tidal volume (≤4 mL/kg), respiratory rate, and plateau pressure, facilitating ultra-lung-protective ventilation to minimize VILI.
- Ventilation in Landmark Trials: The CESAR and EOLIA trials demonstrated reduced mortality with ECMO, highlighting ultra-protective ventilation strategies but emphasizing the need for individualized care.
- Driving Pressure and Mortality: Driving pressure (ΔP) >14 cmH₂O is strongly associated with increased mortality, making it a critical parameter for adjustment during VV-ECMO.
- PEEP Optimization: Proper positive end-expiratory pressure (PEEP) management is crucial to prevent lung derecruitment and overdistension, with patient-specific adjustments often required.
- Mechanical Power: The energy delivered to the lungs by the ventilator (mechanical power) is a key determinant of VILI. Ultra-protective strategies aim to maintain mechanical power ≤10 J/min.
- Role of Spontaneous Breathing: Allowing spontaneous breathing can preserve diaphragmatic function but risks patient self-inflicted lung injury (P-SILI) if not carefully managed.
- Prone Positioning: Combining VV-ECMO with prone positioning enhances oxygenation and facilitates ECMO weaning, though implementation remains limited due to logistical challenges.
- Apneic Ventilation: Near-apneic ventilation, involving minimal tidal volume and driving pressure, shows promise in reducing VILI but requires further validation.
- Advanced Monitoring Tools: Techniques like electrical impedance tomography (EIT) and transpulmonary pressure monitoring aid in optimizing PEEP and ventilation strategies.
- Weaning from ECMO: Transitioning from ECMO to mechanical ventilation requires careful monitoring of tidal volumes, respiratory efforts, and gas exchange to ensure patient stability.
