The children underwent tympanometry and ipsilateral acoustic reflex threshold assessments (middle ear analyzer: Interacoustics® AT235 h, Middelfart, Assens, Denmark). Pure-tone audiometry (air conduction) and a speech test (SRT–speech recognition threshold) were conducted using a GSI 61 audiometer GrasonStadler® (ANSI S3,6-1989; ANSI S3,43-1992; IEC 645-1,1992; IEC 645 – 2, 1993; ISO 389; UL 544) with testing frequencies ranging from 0.25 to 8 kHz, in octave intervals (headphones TDH 50P).
At235 h
Manufactured by Interacoustics
Sourced in Denmark
The AT235 h is a diagnostic audiometer designed for comprehensive hearing assessments. It provides a range of features to facilitate accurate and efficient evaluations of hearing function.
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Lab products found in correlation
5 protocols using at235 h
1
Middle Ear and Hearing Assessment
2
Comprehensive Audiological Evaluation Protocol
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Audiological tests were performed in a standard anechoic chamber with a pure-tone audiometer (Interacoustics AD229b; Interacoustics A/S DK-5610 Assens, Denmark) at frequencies ranging from 250 to 8000 Hz. Using an acoustic emmittance measurement apparatus (Interacoustics AT235h; Interacoustics A/S DK-5610 Assens), auditory brainstem response (ABR) was recorded ipsilaterally in response to click stimuli presented at 100 dBnHL (Interacoustics Eclipse EP2; Interacoustics A/S DK-5610 Assens). Additionally, a distortion product otoacoustic emissions system (DPOAE; 2f1–f2; Interacoustics DPOAE20 + TEb; Interacoustics A/S DK-5610 Assens Denmark) was used, where f2/f1 = 1.22; the level for f1 was 65 dB SPL, and the level for f2 was 50 dB SPL (DP S/N: 5 dB SPL). Ear endoscopy, computed tomography (CT) scans, and magnetic resonance imaging (MRI) were used to exclude deafness caused by anatomical abnormalities of the middle and inner ear.
3
Measuring Middle-Ear Muscle Reflex Thresholds
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As a control, the threshold of activation of the middle-ear muscle reflex (MEMR) was measured using a clinical middle-ear analyzer (Interacoustics AT235h). Middle-ear compliance for a probe tone of 226 Hz and 85 dB SPL was measured in the presence and in the absence of ipsilateral MEMR elicitor tones with frequencies 500, 1000, 2000, and 4000 Hz and levels 75 to 100 dB HL in 5-dB steps. The MEMR activation threshold was regarded as the lowest elicitor level that evoked a detectable change in middle-ear compliance (re the non-elicitor condition) minus 2.5 dB, that is, minus half the elicitor intensity step. Measured MEMR activation thresholds are shown in Table 1 .
4
Comprehensive Hearing Assessment Protocol
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Hearing thresholds were measured using air-conduction pure-tone audiometry (AC40, Interacoustics, Denmark). We calculated the pure tone average (PTA) for each ear by averaging hearing thresholds at 0.5, 1, 2 and 4 kHz frequencies. To discard conductive hearing loss, we also measured the external ear canal acoustic immittance in both ears with a clinical device (AT235H, Interacoustics, Denmark).
5
Comprehensive Audiological Evaluation Protocol
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Audiological tests were performed in a standard anechoic chamber with a pure-tone audiometer (Interacoustics, AD229b, Manufactured by Interacoustics A/S DK-5610 Assens Denmark) at frequencies ranging from 250–8000 Hz. Using an acoustic emmittance measurement apparatus (Interacoustics, AT235 h, Manufactured by Interacoustics A/S DK-5610 Assens Denmark), ABR was recorded ipsilaterally in response to click stimuli presented at 90 dBnHL (ABR, Interacoustics, Eclipse EP2, Manufactured by Interacoustics A/S DK-5610 Assens Denmark), and DPOAE (2f1–f2) (Interacoustics, DPOAE20+TEb, Manufactured by Interacoustics A/S DK-5610 Assens Denmark, f2/f1 = 1.22; the level for f1 was 65 dB spl and the level for f2 was 50 dB spl. DP S/N: 5 dB SPL) was used. Ear endoscopy, CT scans, and MRI were used to exclude deafness caused by anatomical abnormalities of the middle and inner ear.
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