Nonpulsatile blood pumps are mechanical devices useful especially in postoperative cardiac failure. Cardiac failure after myocardial infarction is another indication, which should be considered more frequently. Some of the pumps can be used in ECMO or in assisting a part of the circulation during repair of abdominoor abdominothoracic aneurysms. Different devices are available for clinical use, including impeller, aortic, and spindle-designed devices. Limitations are embolization and hemolysis from the pump.