Those physicians who are at all skilful in methods of physical diagnosis are wont, whenever they come to a case of cardiac or pulmonary disease requiring examination, to listen carefully at the second right costal cartilage for the purpose of determining the character of what is known as the aortic second sound, and in conditions of cardiac and pulmonary diseases which interfere with the circulation between the right and left heart, they are in che habit of studying the quality of the pulmonary second sound, for which they usually listen at the second left costal cartilage. As a matter of fact, the pulmonary second sound is usually better heard in the neighborhood of the third left costal cartilage than the second, although, on the other hand, the aortic sound is usually best heard at the second right costal cartilage. This fact is largely dependent on the relative position of the
RELATIVE CHARACTERISTICS OF THE AORTIC AND PULMONARY SECOND SOUNDS.. JAMA. 1900;XXXIV(9):567. doi:10.1001/jama.1900.02460090053021
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