Which of the following statements describes an arteriovenous CO2 removal system?
A. Oxygenation can be fully supported with this device.
B. Blood flow through the system is driven by a mechanical pump.
C. Nearly all the CO2 can be removed.
D. Approximately, 50% of the cardiac output is shunted.
ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: A novel ECLS technique that does not require a pump is an arteriovenous CO2 removal (AVCO2R) system. With this technique an arteriovenous shunt routes approximately 20% of the cardiac output through a gas exchange device. Blood flow is driven only by the patient's blood pressure. The current design requires 12 to 16 Fr percutaneous catheters and can provide nearly total CO2 removal. Oxygenation cannot be fully supported with this device, and thus some level of respiratory system support is required.
D. Incorrect response: See explanation C.
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