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Results for “Audiometry”

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At least 55 records · Page 3Linked to original sources
PubMed1991

High-frequency audiometry. Accelerometric findings with electric bone-conduction audiometry.

The skull vibrations induced by an electrical high-frequency audiometer (Audimax 500) were measured with a sensitive accelerometer in 5 subjects. The measurements included the maximum output levels, the equivalent threshold force level (ETFL) decreases, the distortions over the whole frequency range (0.5-20 kHz) of the audiometer and the effect of different electrode positions. The results showed that there is a real bone-conduction effect with this audiometer throughout the high-frequency range with the different electrode positions. The mean maximum output level ranged between 60 and 70 dB ETFL in the high-frequency range. The ETFL decrease was of the same order, irrespective of the frequency, but the differences in the maximum output levels at different frequencies necessitate a frequency-dependent additive correction so that the equal hearing level at each frequency can be achieved. When the electrodes were placed on both mastoids, the second harmonic distortions were found only at signal frequencies of 2 and 4 kHz. At the other electrode positions the distortions were increased, however, not being audible.

Adult↗
PubMed1992

High-frequency audiometry. Masking in electric bone-conduction audiometry.

Recently, the 'electric bone-conduction' (EBC) audiometer (Audimax 500) has been used to measure high-frequency (HF) hearing. With this audiometer stimulation is binaural. No commercial masking method was available. In this study, white noise from a Madsen OB822 audiometer and presented via Sony MDR-V4 dynamic earphones, was used for masking. The masking and cross-hearing effect was measured in 8 unilaterally deaf subjects and the masking procedure was tested with 104 young normal-hearing subjects. The results showed that the EBC signals can be masked with air-conduction signals, and thus, the EBC measurements reflect monaural thresholds. The minimum masking level was 50-60 dB SPL in the HF range. There were no cross-hearing problems in the HF range with the earphones used. At the frequencies 0.5-14 kHz, the better ear's masked EBC thresholds were on the average 2.6 dB (range 0-4.5 dB) poorer, compared with the binaural EBC thresholds, indicating a binaural summation effect.

Acoustic Stimulation↗
PubMed1994

Audiometry in industry.

Pure tone audiometry is the most common method of screening for hearing loss. The test itself is straightforward and the equipment readily available, so it forms part of the hearing conservation programmes of many industries. Whilst the test itself is straightforward, because of individual variability in response, interpretation of the results may be difficult. There has therefore been considerable debate on the role of audiometry in hearing conservation. The last official publication dealing with audiometry was a Health and Safety Executive discussion document 'Audiometry in Industry' published in 1978: no current recommendations are available. This article is a critical review of the advice given in that document, which aims to clarify the role that audiometry may play in the conservation of hearing. It was concluded that audiometry in the individual may perform poorly in strict cost benefit terms when used serially to detect a deterioration in hearing of an individual, but as the only form of biological monitoring it should be available to all employees who are advised to wear hearing protection at work. A distinction between audiometry in the individual and group audiometry is then made: the analysis of the hearing of a group may be useful in assessing risk to hearing. Graphical methods of analysis are shown, and more formal methods of statistical analysis discussed.

Audiometry, Pure-Tone↗
PubMed1993

A possible masking effect of tinnitus. Evaluation of CNV audiometry.

To determine whether tinnitus has a masking effect similar to that of general external sounds, the hearing threshold shift when the tinnitus was changed by intravenous administration of lidocaine was measured by contingent negative variation (CNV) audiometry. In a preliminary study, the reliability of CNV audiometry was evaluated in 12 patients with tinnitus. The reproducibility of CNV audiometry was confirmed, based on repeated measurements of CNV audiometry at the tinnitus frequency. The threshold difference between CNV audiometry and pure tone audiometry was -0.76 +/- 1.35 dB, and a high statistical correlation between the threshold of CNV audiometry and pure tone audiometry was evident. The CNV threshold shift at tinnitus frequency after lidocaine injection was measured in 89 ears. In the tinnitus-decreased group, the CNV threshold decreased (4-6 dB) in 22% of cases; however, in the tinnitus-unchanged group, the CNV threshold was little changed. These findings suggest that tinnitus may have a masking effect as is the case with external sounds.

Audiometry, Evoked Response↗
PubMed2000

Influence of age, type of audiometry and child's concentration on hearing thresholds.

Surprisingly little evidence is available in children between the ages of 3 and 7 years on the effect on hearing thresholds of the method of audiometry and of the developmental ability to concentrate and to respond. The Trial of Alternative Regimens in Glue Ear Treatment (TARGET) is a large, national, multi-centre trial of surgical intervention in children with otitis media with effusion (OME) that offers an opportunity to study these effects. Of 1517 children, aged between 3.25 and 6.75 years, reaching the selection stage, 4.5% were unable to give reliable air-conduction thresholds. A further 3% (i.e. 7.5% in all) could not give reliable bone-conduction thresholds. This inability was greatest in the youngest children. During air-conduction testing, a significantly greater proportion (p <0.005) of children were recorded as having only 'fair' or 'poor' concentration on conventional audiometry than with play audiometry. On the other hand, the magnitude of the effect of poor concentration, as rated 'fair/poor' versus 'good', was slightly greater on play as opposed to conventional audiometry (+5 dB versus +3 dB). Although statistically significant, the age of the child had only a very small effect on the air- or bone-conduction thresholds, once the type of audiometry, concentration and the presence of OME had been controlled for. It is concluded that adequately informative thresholds are usually obtainable by conventional audiometry in this age group, even if the concentration is recorded as 'fair' or 'poor'. However, when conventional audiometry is not feasible, play audiometry should be attempted in the 3-5-year-old age group.

Acoustic Impedance Tests↗
PubMed1979

Microprocessor, self-recording and manual audiometry.

AC HTLs were measured on 12 normal-hearing young adults by (a) standardized manual, (b) self-recording (Bekesy), and (c) microprocessor audiometry stimulating standard manual procedure, to determine how threshold measurements would be affected by the 3 methods of testing when utilized in industrial hearing conservation programs for compliance with federal agency recommendations. Self-recording audiometry resulted in mean thresholds lower than standard manual audiometry by from 1-9 db; microprocessor audiometry resulted in thresholds higher than standard manual audiometry by from 0.2-4.4 db except at 4 kc/s where the microprocessor mean threshold was 3.8 db lower. Thus microprocessor audiometry more closely approximated audiometry by standard manual procedure. All 3 methods required 7-8 min per S for a 7-frequency audiogram on both ears.

Adult↗
PubMed1991

[Hearing loss among premature and full-term infants in Rinköbing county. Results of tone and speech audiometry].

A material of 101 out of 111 premature infants admitted with gestational ages less than or equal to 35 weeks and birth weights less than or equal to 2,000 g to the Paediatric Department, Herning Central Hospital during the years 1977-1980 and 101 infants born at term and matched for age and sex were investigated with pure-tone audiometry in quiet surroundings and speech-audiometry in noisy surroundings in the Ringkøbing County Audiological Department in Holstebro. Where all frequencies were concerned, we found slightly more children from the premature group with hearing thresholds greater than 15 dB HL. One premature child had been equipped with a hearing aid (HA) at the age of 6 1/2 years on account of a hearing threshold in the best ear of 55 dB HL for all frequencies. Two children in the premature group had unrecognized hearing loss in the best ear between 30-40 dB HL for the average of the frequencies 500, 1,000 and 2,000 Hz. One of these children was equipped with a hearing aid. None of the children in the control group had hearing loss justifying a hearing aid. Good agreement was found between speech audiometry in noisy surroundings carried out with the Danish test material "Dantale" and pure-tone audiometry. In this group, speech-audiometry did not provide further information as compared with pure-tone audiometry. Although only few children with severe hearing defects were found, it is important that these are detected as soon as possible in view of their intellectual development. Premature infants constitute a risk group for defective hearing.

Audiometry, Pure-Tone↗
PubMed2004

Psychosomatic status affects the relationship between subjective hearing difficulties and the results of audiometry.

OBJECTIVE: Subjective hearing difficulties are often used as a surrogate to audiometry in health check-up, although its effectiveness has not been tested in healthy workers. We conducted a study to test the usefulness of self-reported hearing difficulties for screening hearing impairment among healthy workers by comparing the results with those of audiometry. STUDY DESIGN AND SETTING: This was a cross-sectional observational study. A sample of 12,495 healthy workers in Japan without excess noise exposure was recruited at regular health check-up. Audiometry was conducted after self-administered questionnaire asking symptoms including hearing difficulties. The results were compared to those of audiometry as the gold standard. RESULTS: Overall prevalence of hearing impairment was 4.6% among the population. Subjective hearing difficulties showed 0.21 of sensitivity, 0.95 of specificity, and 0.93 of accordance against audiometry. When limited to those with more than two psychosomatic symptoms, however, the corresponding numbers were 0.43, 0.85, and 0.83. CONCLUSION: The assessment of subjective hearing difficulty may not be able to replace audiometry, but may be useful to detect psychosocial problems of hearing in the workplace.

Adolescent↗