Nitroglycerin has long been famous for its relief of angina pectoris attacks but ruled out for heart attacks on the theory that it harmfully lowers blood pressure and increases heart rate. A heart attack, unlike an angina attack, always involves some localized, fairly rapid heart muscle death, or myocardial infarction. This acute emergency happens when the art eriosclerotic occlusive process in one of the coronary arterial branches culminates so suddenly and completely that the local myocardium—the
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