Carhart Valley
The Carhart depression or Carhart depression (English Carhart's notch ), named after the otologist Raymond Carhart , describes a drop in the bone conduction curve in the tone audiogram at approx. 2000 Hz . The cause is the stiffening of the ossicular chain due to otosclerosis . The Carhart depression is caused by the resonance frequency of the eardrum / ossicular apparatus, which is 2 kHz, and regresses after a successful stapesplasty .
literature
- Hans-Georg Boenninghaus and Thomas Lenarz : ear, nose and throat medicine . 12th edition. Springer, Heidelberg 2004, ISBN 978-3-540-21969-9 , pp. 35 .
Web links
- Diana C. Emanuel: Carhart's Notch - New Research Findings. Audiology Online, June 8, 2009, accessed November 3, 2013 .
