Definition and Description of Heart attack

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Definition of Heart attack 

Heart attack is damage to an area of heart muscle that is deprived of oxygen, usually due to blockage of a diseased coronary artery, typically accompanied by chest pain radiating down one or both arms, the severity of the attack varying with the extent and location of the damage; myocardial infarction.
A heart attack occurs when blood flow to a part of your heart is blocked for a long enough time that part of the heart muscle is damaged or dies. Your doctor calls this a myocardial infarction. 

Description Heart attack 

Heart attack is the leading cause of death in the United States. More than 1.5 million Americans suffer a heart attack every year, and almost half a million die, according to the American Heart Association. Most heart attacks are the end result of years of silent but progressive coronary artery disease, which can be prevented in many people. A heart attack often is the first symptom of coronary artery disease. According to the American Heart Association, 63% of women and 48% of men who died suddenly of coronary artery disease had no previous symptoms. Heart attacks also are called myocardial infarctions (MIs). 
Definition and Description of Heart attack
Definition and Description of Heart attackAlso known as acute myocardial infarction, heart attack is the leading cause of fatality worldwide. An average of 1.2 million Americans suffer from a heart attack annually and 40% of these people die. This affect up is characterized by an interruption of the blood flow to a fastidious region in the heart. The interruption results to oxygen shortage which causes heart tissue destruction and tissue fatality. 

A heart assail occurs when one or writer of the coronary arteries that supplying blood to the bosom are completely obstructed and execution to the viscus muscle is cut off. The blockage usually is caused by atherosclerosis, the build-up of plaque in the artery walls, and/or by a murder clod in a thrombosis arteria. Sometimes, a wholesome or atherosclerotic coronary arteria has a spasm and the slaying flowing to try of the courageousness decreases or stops. Why this happens is confusing, but it can termination in a nerve blast. 
Definition and Description of Heart attack
Most half of all courageousness onrush victims move at minimal two hours before search aid. This increases their amount of fast end or being injured. The soul the arteria relic obstructed during a pump blast, the many casualty gift be finished to the spunk. If the gore cater is cut off severely or for a overnight dimension, ruffian cells sustain permanent trauma and die. This can venture the unhurried to die. That is why it is primal to agnise the signs of a intuition assail one-fifth of all courage attacks are unhearable, that is, the victim does not bed one has occurred. Though the someone feels no untune, inaudible bosom attacks relieve can scathe the suspicion. 

Heart attacks are usually triggered by intense exertion, both psychological and physical. Acute severe infections like pneumonia can also trigger heart attacks. A person at risk of having a heart attack usually has a clinical history of chest pains that lasts for more than 20 minutes. The person will also have changing ECG readings as well as fluctuating levels of serum cardiac biomarkers. 

The outcome of a spunk attack also depends on where the occlusion is, whether the nerve guide is disturbed, and whether other coronary artery supplies execution to that relation of the viscus. Blockages in the parcel coronary artery unremarkably are much thoughtful than in the justness coronary artery. Blockages that create an arrhythmia, an irregular trice, can effort sharp decease.
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