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Is the Carhart notch a predictive factor of hearing ...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7982757/#:~:text=The%20Carhart%20notch%20%28CN%29%20is%20a%20depression%20in,be%20substantially%20improved%20upon%20following%20successful%20stapes%20surgery.
Audiological Evaluation of the Patient with Otosclerosis ...
https://entokey.com/audiological-evaluation-of-the-patient-with-otosclerosis/
Note Carhart’s notch at 2000 Hz. (B) Pure tone audiogram of a patient who has a central perforation. There is no notch at 2000 Hz. (Adapted from Beales, PH. Otosclerosis . Bristol; John Wright and Sons: 1981. Used with permission.) Carhart’s notch is thought to be typical of otosclerosis (Carhart 1950, 1962). It is characterized by the elevation of bone …
Carhart Notch-A Prognostic Factor in Surgery for …
https://pubmed.ncbi.nlm.nih.gov/31558062/
Carhart Notch-A Prognostic Factor in Surgery for Otosclerosis. (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 ….
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 …
Is the Carhart notch a predictive factor of hearing ...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7982757/
The Carhart notch (CN) 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 upon following successful stapes surgery.
Carhart Notch—A Prognostic Factor in Surgery for …
https://journals.sagepub.com/doi/full/10.1177/0145561319864571
(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.
Audiological evaluation of the patient with otosclerosis
https://drchrisdesouza.com/ENT-surgeon/audiological-investigation-of-otosclerosis.htm
The audiological signature pattern of fenestral otosclerosis include the following: Conductive hearing loss with Carhart’s notch at 2KHz. Excellent speech discrimination scores ( Also seen in cochlear otosclerosis) Low compliance on Impedance (immitance) audiometry ( less than 0.3cc) Seen in fenestral as well as cochlear otosclerosis.
Why Does the Carhart Notch appear at 2000Hz? Diana C ...
https://www.audiologyonline.com/ask-the-experts/why-does-carhart-notch-appear-509
An audiometric finding characteristic of otosclerosis is an increase in bone conduction threshold with a peak at 2,000 Hz known as Carhart's notch (Carhart, 1950). Although the notch occurs at 2,000 Hz, a reduction in bone conduction sensitivity is seen from 500 to 4,000 Hz which is, on average, 5 dB at 500 Hz, 10 dB at 1000 Hz, 15 dB at 2000 Hz, and 5 dB at 4,000 …
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