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Transcript
Skipping the Beat The “Beatless” Heart Tyler Blake Professor Ying Sun University of Rhode Island BME 281 “Wings that flap didn’t help mankind fly, so why must a substitute heart beat like a natural one? ‘Mother nature did the best she could’” ~Billy Cohn, researcher at Texas Heart Institute This past year a 55 year old man from Texas had the first beatless heart transplant saving him from a death doctors told him was 12 hours away; he had no pulse and was technically flat lined but was not dead. The normal human heart works on a system using cardiac muscles: • Electrical impulses tell cardiac muscles to squeeze • Blood pushes through each of the heart's four chambers • The pulse or “beat” allows for blood to circulate through the body efficiently Rather than using a “beating” mechanism that would mimic the body’s heart, Dr. Cohn and Dr. Frazier devised a system entirely different. • They interconnected two ventricular assist devices • The rotors in the devices work together to whirl around the blood in the device • The device propels the blood through the vascular system in a continuous flow Ventricular Assist Device • Ventricular assist devices were invented in 1980 • Recently Dick Cheney had one implanted to help with ventricular failure • This past year has been the first time a complete heart was created from two assisting devices. • These devices connect the ventricles to the aorta and so help each ventricle push the blood by push the blood by battery powered rotors. powered rotors.