The invention relates to a cardiopulmonary bypass pump that can be used with medication to put the heart into asystole or near asystolic status. The patent describes equipment used in conjunction with medication to temporarily replace the function of the heart and to allow the heart to survive with minimal oxygen supply for hours or days, and for the heart to recover from ischemic or other insult or other damage without being subjected to a heavy working load. The invention provides a means to stop blood flow to the heart for a relatively long period of time, thereby allowing the performance of certain procedures that require coronary artery blockade. It also allows the heart to stop contracting, which may result in safer and easier performance of some procedures. A medication is given to the patient while the device is in use in order to stop the heart or slow the heart rate to a minimal level to decrease cardiac oxygen requirements without significant hemostasis in the pulmonary circulation.