This paper is intended to be a supplement to an essay "On Variations of Pitch in Percussion and Respiratory Sounds, and their application to Physical Diagnosis," to which was awarded a prize by the American Medical Association in 1852. The introduction to that essay was as follows: "Very little attention has hitherto been paid to variations in the pitch of the sounds heard in the practice of percussion and pulmonary auscultation. The sibilant and sonorous râles, it is true, are distinguished from each other chiefly by a contrast in pitch, but as respects the remainder of the physical signs pertaining to pulmonary disease, they appear not to have been much studied in this aspect, and even the facts that have arrested notice do not seem to have been applied, plied, save in a very limited degree, to physical diagnosis. By most writers on physical exploration, pitch modifications, except in the
FLINT A. ON THE DIFFERENTIATION, BY MEANS OF THE PITCH OF SOUND, OF PULMONARY SIGNS OBTAINED BY AUSCULTATION AND PERCUSSION. JAMA. 1885;IV(25):673–677. doi:10.1001/jama.1885.02391000001001
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