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www.SCAI.org/Guidelines
Figure 10. Hemodynamic Effects of Acute Circulatory
Support Pumps
A: Intra-aortic balloon counterpulsation pumps (IABP) displace blood volume in the
aorta and have the primary effect of reducing LV end-systolic pressure without a major
change in arterial elastance (Ea) or LV volumes.
B: Percutaneous LV assist devices can directly unload the LV (Impella) or indirectly unload
the LV by creating a percutaneous le atrial to femoral artery bypass (pLA-FA) circuit.
Both pumps will reduce LV volume and pressure in the setting of cardiogenic shock.
C: Veno-arterial extracorporeal membrane oxygenation (VA-ECMO) will increase arterial
elastance (Ea) and LV endsystolic pressure without reducing LV volumes.
