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Carhart’s notch – Ent Scholar
https://entscholar.wordpress.com/article/carharts-notch/
Audiogram in airconduction shows a decrease in air conduction at all frequencies. Carharts notch 2 is actually a decrease in bone conduction of 10-15 dB seen around 2 kHz frequency. Bone conduction actually means sensorineural reserve. After successful stapes surgery the carharts notch disappears when the conductive hearing improves.
What is the Carhart notch in Pure Tone Audiometry?
https://www.interacoustics.com/us/academy/faq/audiometry/what-is-the-carhart-notch-in-pure-tone-audiometry
Impairment of bone conducted vibrations, for example by stapes footplate fixation, results in raised thresholds by bone conduction. This effect arises across the frequency range and is related to the resonance properties of the ossicular chain. The result is a “notch” in the bone conduction audiogram which is more pronounced at 2 kHz as described by Carhart in 1950.
Carhart notch and electric bone-conduction audiometry
https://pubmed.ncbi.nlm.nih.gov/8085115/
The Carhart notch is a depression in the bone-conduction audiogram of patients with clinical otosclerosis. The middle frequencies from 0.5 to 2 kHz, which correspond to the resonance frequency of the middle ear, can be substantially improved following successful stapes surgery. Twenty-nine consecuti …. The Carhart notch is a depression in the bone-conduction audiogram …
Carhart Notch-A Prognostic Factor in Surgery for …
https://pubmed.ncbi.nlm.nih.gov/31558062/
Conclusion: (1) The presence of a refraction of the bone conduction curve with a depth of 10 to 20 dB at a frequency of 2000 Hz (the so-called Carhart notch) in the presurgical tonal audiogram is an unfavorable prognostic factor in relation to closing the cochlear reserve and improving bone conduction after the stapedotomy. (2) Regardless of the presence or absence of Carhart notch …
ENT Carhart Notch Audiogram Pure Tune Audiometry ...
https://www.youtube.com/watch?v=uwiZXm_8Pfo
#carhart #notch #otospongiosisDip at 2000Hz Bone Conduction frequencyPlaylist https://www.youtube.com/playlist?list=PLKKWBex6QaMCojCF2tDToiD …
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