Cardiologists are the specialists who diagnose, treat and prevent diseases that mainly affect the heart and blood vessels. They treat ongoing, long-term illnesses or will respond to emergency, potentially life-threatening situations. Some of the diseases include high blood pressure, angina, heart disease, heart failure, cardiac arrest and coronary heart disease. Cardiologists develop their role in areas of sub-specialty interest, such as: interventional, electrophysiology, transplant, cardiac imaging, and heart failure, pediatric