• Chest · Sep 1995

    Biography Historical Article

    About egophony.

    • J D Sapira.
    • St. Louis University, Missouri, USA.
    • Chest. 1995 Sep 1;108(3):865-7.

    AbstractEgophony 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 frequency [corrected] 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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