The finding of diplacusis in a case of deafness is a valuable diagnostic aid in localizing the pathologic condition, since diplacusis can be caused only by a lesion of the organ of Corti.
This statement is based on theoretic considerations, which I shall discuss, and on clinical observations, which I shall describe. If it is true, some practical applications follow for the diagnosis and treatment of certain cases of deafness and of Ménière's syndrome.
Definition.—diplacusis is the hearing of one sound as two. There are three varieties of diplacusis: Diplacusis binauralis echotica, in which a sound is heard a fraction of a second later by one ear than by the other, as a distinct echo, is comparatively rare. I have observed it but once (case 8). Diplacusis monauralis dysharmonica, in which a pure tone is heard by the affected ear as a double tone of two different pitches,
SHAMBAUGH GE. DIPLACUSIS: A LOCALIZING SYMPTOM OF DISEASE OF THE ORGAN OF CORTI: THEORETIC CONSIDERATIONS, CLINICAL OBSERVATIONS AND PRACTICAL APPLICATION. Arch Otolaryngol. 1940;31(1):160–184. doi:10.1001/archotol.1940.00660010161016
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