Cardiology is a branch of medicine that specializes in studying disorders of the heart and blood vessels. What diseases are treated and when do you need to see a cardiologist? Check out the explanation below. In practice, cardiology is the science of diagnosing and treating various cardiovascular diseases such as coronary heart disease, heart rhythm abnormalities (arrhythmias), heart failure, heart valve disease, and congenital heart defects. Doctors who specialize in cardiology are called cardiologists, cardiologists and blood vessels, or cardiologists. The cardiologist is in charge of treating patients who have conditions such as: Angina, chest pain caused by narrowing of the arteries of the heart or coronary heart disease. Arrhythmia, irregular heartbeat, too slow, or too fast. Heart murmurs (whistling sounds made by turbulent blood near or inside the heart). Heart murmurs can be heard by doctors using a stethoscope. Heart attack. Cardiac arrest. Heart valve disease. Cardi