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.
Severe, prolonged untreated bradycardia can cause: 1  Heart failure. 2  Syncope (loss of consciousness; fainting) 3  Angina pectoris (chest pain) 4  Low blood pressure or hypotension. 5  High blood pressure or hypertension.