When a robust man suddenly drops dead and the newspapers report "heart failure," the probability is that he died during an attack of angina pectoris. If he had gone to his doctor the day before, the doctor would probably have slapped him on the back and told him that his heart was as sound as a dollar. The underlying conditions which bring on an attack of angina pectoris usually exist in the arteries of the heart muscle. Yet the physician may not be able to detect them with a cardiograph or x-rays. In...
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