BSIP DUCLOUX / SCIENCE PHOTO LIBRARY BSIP DUCLOUX / SCIENCE PHOTO LIBRARY
Heart attack ECG. Computer graphic showing the abnormal electrocardiogram (ECG) traces occurring during a myocardial infarction, or heart attack. An ECG measures the electrical activity of the heart muscle. The different wave patterns produced show the random beating of the heart. The ECG will determine whether it is the atria or ventricles of the heart, or even both, that are beating out of sequence. Heart attacks are caused by the death of heart tissue (necrosis) through lack of oxygen. This most commonly occurs when a clot (thrombus) cuts off the blood supply in a coronary artery that has already been narrowed by atherosclerosis.
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