“With the invention of the electrocardiogram in 1903, physicians were able to trace the messages carried by the heart’s conduction system of fibers, and they soon learned to interpret the tracings made by electrical changes taking place when the heart muscle is endangered by a decreased blood supply. Other diagnostic techniques were discovered apace, including the fact that injured myocardium releases certain chemicals or enzymes whose identifiable presence in the blood aids in detecting infarction.”
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