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Selecting the 'right' positive end-expiratory pressure level.

Luciano Gattinoni1, Eleonora Carlesso, Massimo Cressoni

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Selecting positive end-expiratory pressure (PEEP) for severe hypoxemia requires balancing oxygenation and lung opening. PEEP/inspiratory oxygen fraction tables offer tailored PEEP levels for varying patient recruitability, unlike other methods.

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Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Mechanical Ventilation

Background:

  • Positive end-expiratory pressure (PEEP) is crucial for managing severe hypoxemia and acute respiratory distress syndrome (ARDS).
  • Optimal PEEP selection remains debated, with strategies focusing on oxygenation or lung recruitment.
  • Recruitment maneuvers aim to open collapsed lung areas, but require adequate PEEP to maintain lung expansion.

Purpose of the Study:

  • To compare PEEP selection strategies targeting either oxygenation or full lung opening.
  • To evaluate the effectiveness of different PEEP titration methods in ARDS patients.

Main Methods:

  • Review of studies comparing PEEP selection based on oxygenation response, respiratory mechanics, and lung imaging.
  • Analysis of PEEP titration using the deflation limb of the pressure-volume curve.
  • Investigation of transpulmonary pressure estimation methods.
  • Assessment of PEEP calculation using computed tomography and chest wall elastance.

Main Results:

  • Increasing PEEP in severe hypoxemia improves outcomes if oxygenation response is significant.
  • Oxygenation response to recruitment maneuvers predicts better outcomes in ARDS, particularly with influenza A (H1N1).
  • Most PEEP selection methods yield similar values across patient groups, except for PEEP/inspiratory oxygen fraction tables.

Conclusions:

  • PEEP/inspiratory oxygen fraction tables are unique in providing lower PEEP for low recruiters and higher PEEP for high recruiters.
  • The choice between oxygenation and respiratory mechanics as the primary PEEP selection marker is still under investigation.
  • Consensus on transpulmonary pressure measurement methodology is lacking.