The term heart disease actually applies to a number of illnesses that affect the circulatory system, which consists of heart and blood vessels. It is intended to deal here only with the condition commonly called "Heart Attack" and the factors, which lead to such condition.
Heart attack is the popular term for sudden pain in chest with breathing difficulty arising out of certain heart conditions. Heart attacks can be suddenly fatal, but the great majority- an estimated 85 percent are not. The patient recovers under proper treatment and goes on to live many useful years.
Like all muscles and organs of the body, the heart also needs nourishment and food which it gets thorough its own arterial system. The arteries, which supply blood to the heart muscle, may lead to impairment of its function. The sudden narrowing of the artery may result in the sudden stoppage of blood supply to the heart muscle. Such attacks of narrowing of arteries are called angina. If the damage takes place it is called infarction.
Infarction can also occur because of a blood clot, big enough to interfere with blood supply, is formed in the coronary artery. This formation of blood clot is called trombosis and the clot itself is known a thrombus. The term coronary heart disease is usually applied to diseases of the heart secondary to defective or interrupted supply of blood to the heart muscles through the coronary arteries.
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