Effect of Different VV ECMO Flows on Lung Perfusion Monitored by EIT

Study Overview
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Brief Summary
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The purpose of this study is to investigate the feasibility of using electric impedance tomography (EIT) to monitor lung perfusion during veno-venous (VV) extracopreal membrane oxygenation (ECMO) support, as well as the effect of different ECMO flows on lung perfusion monitored by EIT.

Detailed Description
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This is a monocentric obsevensional study that uses EIT to monitor lung perfusion during VV ECMO support and the effect of different ECMO flows on lung perfusion as measured by EIT. Patients on VV ECMO who meet the withdrawal criteria as determined by clinical experts will have their ECMO flow gradually reduced. EIT lung ventilation and perfusion monitoring were performed at various ECMO flows.

Official Title
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Effect of Different VV ECMO Flows on Lung Perfusion Monitored by EIT: an Observational Study

Conditions
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Critical Illness

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients aged ≥ 18 and ≤ 70 years； Patients supported with VV ECMO for respiratory failure； Patients are intubated and mechanically ventilated. Exclusion Criteria: EIT contraindications such as chest wound dressing, pacemaker installation, defibrillator, etc; Patients who did not sign the informed consent form; Pulmonary embolism; Pneumothorax; Medium to plenty of chest water; Atrial fibrillation or other malignant arrhythmia leads to a decrease in cardiac output; Refractory shock; Severe chronic heart and lung disease has existed in the past; BMI>35 kg/m2; Intra-abdominal pressure >20mmHg.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Lung perfusion at different VV ECMO flows | Effect of Different VV ECMO Flows (ECMO flow at 4.5L,3.5L,2.5L,1.5L, and after ECMO withdrawal) on lung perfusion distribution Monitored by EIT | up to 24hour | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Lung ventilation at different VV ECMO flows | Effect of Different VV ECMO Flows (ECMO flow at 4.5L,3.5L,2.5L,1.5L, and after ECMO withdrawal) on lung ventilation distribution monitored by EIT | up to 24hour | 
| Lung deadspace region at different VV ECMO flows | Effect of Different VV ECMO Flows (ECMO flow at 4.5L,3.5L,2.5L,1.5L, and after ECMO withdrawal) on lung deadspace region monitored by EIT | up to 24hour | 
| Lung shunt region at different VV ECMO flows | Effect of Different VV ECMO Flows (ECMO flow at 4.5L,3.5L,2.5L,1.5L, and after ECMO withdrawal) on lung shunt region monitored by EIT | up to 24hour | 
| Lung ventilation/perfusion matching at different VV ECMO flows | Effect of Different VV ECMO Flows (ECMO flow at 4.5L,3.5L,2.5L,1.5L, and after ECMO withdrawal) on lung ventilation/perfusion matching monitored by EIT | up to 24hour | 
| Recirculation at different VV ECMO flows | Recirculation at different VV ECMO flows (ECMO flow at 4.5L,3.5L,2.5L,and1.5L) | up to 24hour | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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VV ECMO, EIT, Lung perfusion