Hemodynamic monitoring during ECMO

Area of Science:

• Cardiopulmonary Physiology
• Critical Care Medicine
• Hemodynamic Monitoring

Background:

• Extracorporeal membrane oxygenation (ECMO) is vital for acute respiratory distress syndrome and cardiogenic shock.
• ECMO significantly alters cardiopulmonary physiology, complicating standard hemodynamic monitoring.
• Conventional monitoring methods often lose validity or require reinterpretation during ECMO.

Purpose of the Study:

• To review current evidence on hemodynamic monitoring during venovenous (VV) and venoarterial (VA) ECMO.
• To critically evaluate commonly used monitoring modalities and their limitations.
• To propose a framework for physiology-guided, multimodal hemodynamic monitoring in ECMO patients.

Main Methods:

• Literature review of hemodynamic monitoring techniques during VV- and VA-ECMO.
• Critical evaluation of echocardiography, arterial pressure monitoring, thermodilution, pulmonary artery catheterization, and microcirculatory monitoring.
• Analysis of pathophysiology, limitations, and misinterpretations specific to ECMO configurations.

Main Results:

• Standard monitoring techniques like pressure-derived methods have limited validity during ECMO.
• VA-ECMO presents unique challenges due to parallel circulation and flow mixing.
• Dissociation between systemic targets and tissue perfusion, and occult shock, are significant concerns.

Conclusions:

• No single monitoring modality is sufficient for ECMO patients.
• A multimodal monitoring framework integrating pressure, flow, volumetric, and microcirculatory data is crucial.
• Longitudinal trends and complementary parameter interpretation guide individualized clinical decisions, preventing delayed recognition of complications.