Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The human heart is one of the most crucial organs in the human body, providing a continuous blood circulation via the cardiac cycle. It is divided into four chambers which are separated by valves. Diseases, age-related factors and congenital defects are endangering the normal functions of both, the heart and its valves, leading to serious health consequences and even death. Recently, a new type of artificial heart valve, designed for people who aren’t healthy enough to undergo a more invasive open-heart surgery, is rising concerns amongst US FDA officials about its effectiveness and benefits. Learn more about the artificial heart valve and its subtypes in this book.