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Gerhardt's sign
Also known as:
Gerhardts Schallwechsel (German)
Gerhardt-Biermer change of note
Biermer’s change of note
Associated persons:
Michael Anton Biermer
Carl Jakob Adolf Christian Gerhardt
Description:
Perkutory phenomenon in larger longitudinal or oval lung caverns containing fluids. Because the secrete mirror is always horisontal, there is a change of percussion note when the patient changes position.
Several authors describe this as being identical to Biermer’s sign, but that is strictly not correct.
Bibliography:
- C. J. A. C. Gerhardt:
Lehrbuch der Auscultation und Percussion.
3rd edition, 1876.
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