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In page Extracorporeal membrane oxygenation:

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For those with respiratory failure, improvements in radiographic appearance, pulmonary compliance, and arterial oxyhemoglobin saturation indicate that the person may be ready to be taken off ECMO support. For those with cardiac failure, enhanced aortic pulsatility correlates with improved left ventricular output and indicates that they may be ready to be taken off ECMO support. If all markers are in good status, the blood flows on the ECMO will be slowly decreased and the patients parameters will be observed during this time to ensure that the patient can tolerate the changes. When the flows are below 2 liters per minute, permanent removal is attempted and the patient is continued to be monitored during this time until the cannulae can be removed.[1]