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About Egophony FREE TO VIEW

Joseph D. Sapira
Author and Funding Information

From St. Louis University and the DVAMC, St. Louis


1995 BY THE AMERICAN COLLEGE OF CHEST PHYSICIANS


Chest. 1995;108(3):865-867. doi:10.1378/chest.108.3.865
Text Size: A A A
Published online

Abstract

Egophony is a change in timbre (Ee to A) but not pitch or volume. It is due to a decrease in the amplitude and an increase in the intensity of the second formant, produced by solid (including compressed lung) interposed between the resonator and the stethoscope head. This explains certain difficulties in learning this valuable but currently neglected sign as well as in understanding certain physiologic false-positive occurrences.


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  • CHEST Journal
    Print ISSN: 0012-3692
    Online ISSN: 1931-3543