Protective mechanical ventilation, why use it?

Area of Science:

• Critical Care Medicine
• Pulmonology
• Respiratory Physiology

Background:

• Mechanical ventilation (MV) strategies have evolved towards lower tidal volumes (VT).
• High VT use is common in patients without acute lung injury (ALI) or acute respiratory distress syndrome (ARDS).
• Retrospective studies link high VT to ventilator-induced lung injury (VILI).

Purpose of the Study:

• To review evidence guiding protective MV in healthy lungs.
• To suggest strategies for ventilating lungs with ALI/ARDS.
• To optimize mechanical ventilation practices.

Main Methods:

• Literature review of key articles on mechanical ventilation strategies.
• Analysis of studies focusing on tidal volume and lung protection.
• Synthesis of expert recommendations and current evidence.

Main Results:

• Evidence for optimal ventilation in healthy lungs remains limited.
• Protective MV strategies aim to minimize alveolar stress.
• Current recommendations suggest specific VT, PEEP, and plateau pressure targets.

Conclusions:

• Lowering VT (< 10 mL/kg) and using PEEP (≥ 5 cmH2O) with controlled plateau pressure (< 15-20 cmH2O) may prevent lung injury.
• These strategies aim to reduce alveolar stretching and inflammation.
• Further studies are needed to establish definitive guidelines for healthy lungs.