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The heart is complicated, and hard-working organ (Heart Attack, 2003), and is the only kind of muscle that can contract regularly without tiring; while other muscles require periods of rest (Ray Chu-Jeng Chui, 2001). There are several types of cardiac dysfunction, but heart attacks and the condition called angina are not diseases of the heart itself (Heart Attack, 2003). A heart attack, or cardiac arrest, is the abrupt cessation of normal circulation of the blood due to failure of the heart to contract. It is a medical emergency that, in certain cases patients, is potentially reversible if treated early enough. When unexpected cardiac arrest leads to death, it is called sudden cardiac arrest, often referred to as SCD (Cardiac Arrest, 2007).
The study of cardiology has evolved throughout the centuries. We have solved many medical mysteries due to this progression in medicine. Peter Safar, Robert Jarvik, and Ray Chu-Jeng Chiu are three medical inventors that have contributed to the significant progression of medicine in the past century. Even today, their simple inventions save the lives of millions.
