Electrical impedance tomography to set positive end-expiratory pressure

Area of Science:

• Critical Care Medicine
• Respiratory Physiology
• Medical Imaging

Background:

• Positive end-expiratory pressure (PEEP) management is crucial in mechanical ventilation.
• Traditional PEEP setting relies on global respiratory mechanics and oxygenation.
• Limitations exist in optimizing PEEP for individual patient needs and regional lung status.

Purpose of the Study:

• To review the rationale and concepts for setting PEEP using electrical impedance tomography (EIT).
• To summarize the effects of EIT-based PEEP on cardiopulmonary function.
• To highlight EIT's role in individualized PEEP optimization.

Main Methods:

• Electrical impedance tomography (EIT) provides regional lung assessment.
• The overdistension and collapse (OD-CL) method is a primary EIT-based approach for PEEP setting.
• Studies in ARDS patients and porcine models were analyzed.

Main Results:

• EIT enables patient-specific assessment of PEEP effects on lung recruitability and overdistension.
• The OD-CL method identifies PEEP levels associated with low overdistension and collapse.
• EIT-guided PEEP demonstrated improved lung mechanics, adequate hemodynamics, and sufficient gas exchange in ARDS.
• A meta-analysis indicated potential outcome improvements with EIT-based PEEP.

Conclusions:

• EIT is a valuable tool for guiding individualized PEEP settings.
• EIT provides cardiopulmonary information beyond traditional respiratory mechanics and oxygenation.
• EIT facilitates PEEP optimization for improved patient management.