A design approach is a general philosophy that may or may not include a guide for specific methods. Some are to guide the overall goal of the design. Other approaches are to guide the tendencies of the designer. A combination of approaches may be used if they don't conflict.
Bradycardia can be caused by: 1  Changes in the heart that are the result of aging. 2  Diseases that damage the heart's electrical system. These include coronary artery disease, heart attack, and infections such as endocarditis and myocarditis. 3  Conditions that can slow electrical impulses through the heart.
More commonly, we just call this a heart attack. When the blood supply is cut off to the heart, the heart muscle doesn't receive oxygen, resulting in injury. So, just like an injured athlete slows down, so too does an injured heart. Another cause of bradycardia is hypertension, or high blood pressure. High blood pressure makes it very difficult for your heart to push blood out into circulation and causes a reflex in your body (called reflex bradycardia) that slows down the heart in order to try and lower the blood pressure.