Severe Lung Dysfunction and Pulmonary Blood Flow during Extracorporeal Membrane Oxygenation

Area of Science:

• Critical Care Medicine
• Cardiology
• Pulmonology

Background:

• Extracorporeal membrane oxygenation (ECMO) is a life-support measure for severe respiratory or circulatory failure.
• Computed tomography (CT) is the standard imaging for pulmonary damage during ECMO.
• Assessing lung viability and predicting recovery remain challenges in prolonged ECMO.

Purpose of the Study:

• To determine if echocardiography-derived pulmonary blood flow (PBF) can assess pulmonary damage during ECMO.
• To investigate the association between echocardiography, CT findings, and patient outcomes.
• To evaluate CT's effectiveness in visualizing lung parenchyma during ECMO.

Main Methods:

• Retrospective, single-center study of patients (>15 years) on ECMO for pulmonary septic shock (>28 days).
• Screened 277 patients, identifying 9 with consecutive CT and echocardiography.
• Analyzed PBF, CT findings, and outcomes in survivors and non-survivors.

Main Results:

• CT did not differentiate viable lung parenchyma between survivors and non-survivors.
• Initial PBF was similar in survivors and non-survivors.
• Survivors maintained stable PBF, while non-survivors showed significant PBF deterioration (p=0.029).
• Non-survivors had significantly lower tidal volumes over time (p=0.047).

Conclusions:

• CT is ineffective for evaluating pulmonary viability or recovery in prolonged ECMO for septic shock.
• Echocardiography-assessed PBF shows potential for predicting pulmonary recovery during ECMO.
• This study supports echocardiography as a valuable tool for monitoring lung status in ECMO patients.