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Master Thesis

Étude de l’effet squelch chez les malades opérés d’une otospongiose unilatérale : une étude de la compréhension dans le bruit avant-après chirurgie : étude CBOU

Abstract : Otosclerosis is a disease that causes conductive hearing loss.This clinical study evaluated the benefit of binaural hearing recovery after surgical treatment in unilateral otoslerosis studying the squelch effect, the head shadow effect avec the binaural redundancy.The CBOU prospective study enrolled 25 patients with an unilateral clinical otosclerosis operated of stapedectomy. All subjects underwent free field audiometric french MATRIX test. With the speech source in front of the patient, three conditions were studied : noise in front of the patient (S0N0 situation), on the normal hearing side (S0N+90 situation), and on the operated side (S0N-90 situation). Audiometry was thus performed before, 3 months and 9 months after surgery. The study of the speech reception threshold (SRT) allowed to calculated Squelch effet : difference of post/pre-operative S0N+90 condition; Head shadow effect : absolute value of the difference of the S0N+90 and S0N-90 conditions; Binaural redundancy :difference of post/pre-operative S0N0 condition.The squelch effect associated with the benefit of the recovery of binaural hearing is 3,2 dB SNR in early post-operative and 4,0 dB SNR in late post-operative. The head shadow effect decrease from 2,3 dB SNR in pre-operative to 1,3 dB SNR 3 months and 1,1 dB SNR 9 months after surgery. The binaural redundancy shows a benefit of 1,4 dB SNR at 3 months and of 1,6 dB SNR at 9 months after surgery.The stapedectomy for subjects with unilateral otosclerosis restores the squelch effect and the binaural redundancy. The head shadow effect seems to be associated with the asymetric auditory threshold between the two ears before surgery and decrease after surgery.
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Master Thesis
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Submitted on : Tuesday, October 8, 2019 - 5:10:04 PM
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Ashley Baguant. Étude de l’effet squelch chez les malades opérés d’une otospongiose unilatérale : une étude de la compréhension dans le bruit avant-après chirurgie : étude CBOU. Médecine humaine et pathologie. 2019. ⟨dumas-02308797⟩

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