Which mechanical circulatory support device provides flow that supports tissue perfusion and oxygenation?

• A. IABP
• B. LVAD
• C. V-A ECMO
• D. V-V ECMO

Answer: (C)

The device that provides flow to sustain tissue perfusion while also delivering oxygenated blood to the body's tissues is the venous-arterial ECMO. It draws deoxygenated blood from the venous system, oxygenates it, and returns it to the arterial circulation, effectively bypassing both the failing heart and lungs. This combination ensures there is enough forward flow to perfuse organs and enough oxygen content in that blood to meet tissue needs.

Other devices have limitations in one or both areas. An intra-aortic balloon pump mainly augments coronary perfusion and reduces afterload without providing significant systemic oxygen delivery. A left ventricular assist device increases forward flow from the left ventricle but does not oxygenate blood. Venous-venous ECMO oxygenates blood but relies on the heart to provide adequate systemic perfusion, which may be insufficient if cardiac function is severely impaired.