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.
If the tests find that you do have mild bradycardia and you donât have symptoms, your doctor will keep an eye on your condition, but you may not need treatment. What Causes Bradycardia. Your heart has a built-in pacemaker called the sinoatrial (SA) node that tells your heart how quickly to beat. As you age, the sinoatrial node can slow down, and that slows down your heart beat rate. Another cause of bradycardia is when the atrioventricular (AV) node stops working well and leads to a slower heart rate, Moss says.