best cardiologist in bangalore Heart attack Heart attack is a commonly known term as it is a cause for a huge number of deaths every year around the world. In medical terms, this emergency is called myocardial infarction. A heart attack is a result of the narrowing of the coronary artery. The coronary arteries in a human body are the carriers of the oxygenated or pure bold. These arteries do the function of taking this pure or oxygenated bold to the heart, which then pumps it back. When a coronary artery narrows or in case there is a blocking, the artery fails to supply blood in an effective manner. Many a times, because of this blocking, the blood supply gets cut off completely, due to which the heart muscle goes into shock and causes a heart attack.