This document discusses hemodynamic support devices used in the cath lab, including the Impella system. It outlines the types of indications for cath lab hemodynamic support, such as elective high-risk PCI, PCI for cardiogenic shock, and recent high-risk acute coronary syndrome. The document reviews evidence from the PROTECT II trial that demonstrates improved left ventricular function and NYHA class with the Impella system, as well as superior outcomes compared to intra-aortic balloon pumps. It concludes that the Impella system provides better hemodynamic support than intra-aortic balloon pumps, especially when placed pre-PCI, for high-risk PCI and cardiogenic shock patients.