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PubMed1984

[Limits of brain-stem audiometry in pedaudiology].

The limitations of BERA in paedaudiology are demonstrated in the light of some own observations, without depreciating the importance of the BERA. On the one hand there are simple faults in the interpretation, on the other great difficulties exist in the diagnosis of hearing loss above 1000 cps and hypoacusis of a higher degree. In the latter case, BERA cannot be used to differentiate it from anacusis. Disturbances in the processing of ultra-short sounds and of sounds with a too short stimulation interval can also cause an incorrect interpretation of the results obtained via BERA.

Age Factors↗
PubMed1983

[Data telecommunication in electric response audiometry (ERA)].

Telephone-lines suit for the transmission also of digital data along long distances. In ERA this technique is favourable. --because the application of a computer is necessary anyway and the primarily analogous data have to be transformed to digital ones anyhow and --because the expenses for purchase, maintainance and operation of the complete equipment stress practices and small hospitals disproportionately. To test "ERA via telephone" we established outstations, the peripheral measuring equipment of which was composed of commercially available devices (Digital Equ. Corp.); only the computer controlled stimulator originated from our own construction. The communication software between central and peripheral station was written in a way that the realtime feature of the registration was preserved and, therefore, only about 30 min are necessary to obtain the intensity-latency time-function (P6/JV) of both ears.

Audiometry↗
PubMed1981

CPA tumors with normal routine audiometry and positive reflex and BSER tests.

Recently, in a ten-day-period, three patients whose hearing was within normal limits with good speech discrimination were found to have large cerebellopontine angle tumors. There were neurologic symptoms in only one patient. In these three cases, stapedius reflexes were absent with the affected ear stimulated. Brain stem evoked responses (BSER) were clearly abnormal in the three cases. Postoperative brain stem testing showed essentially no change in the nonoperated ear owing to brain stem manipulation. In two cases hearing was preserved. In one patient, the brain stem recordings returned to near-normal after surgery. In another, brain stem responses remained the same and the stapedius reflexes returned to normal. It appears that stapedius reflex testing and the BSER are highly useful tools that can be used to diagnose an acoustic neuroma before it grossly affects hearing.

Adult↗
PubMed1982

Frequency specificity and on-effect in brainstem electric response audiometry.

Auditory brainstem responses recorded with tone bursts (1, 2, 3, 4 kHz; 70, 50, 30 dB SL) are compared with the recordings obtained with merely the first period of these bursts. No significant differences are found. The initial cycle of a tone burst is apparently the effective stimulus for the brainstem potential. This illustrates how the brainstem electric response is an on-effect. Measurements of the frequency spectra of the first period stimuli indicate better the real frequency specificity of the tone burst method. As duration is irrelevant for evoking the auditory brainstem response, single sine stimuli seem to offer the maximum frequency specificity that can be obtained with tonal stimuli.

Audiometry↗
PubMed1981

High-frequency Bekesy audiometry: III. Reliability and validity revisited.

Normal-hearing young adults (N: 30) produced 3 fixed-frequency monaural audiograms by Bekesy tracking on a Grason-Stadler E-800 audiometer (modified for high frequencies) for pulsed pure tones in 2-kc/s steps progressively from 7-19 kc/s. The earphone was not moved between one pair of audiograms but was removed and replaced between another pair. After 1 mo, 16 Ss returned for retest on the HF E-800 audiometer and on a similar audiometer using the conventional Method of Limits. Maximum group mean retest HTL differences approximated 5 db. Statistical analysis indicated that the arrays of HTLs within and across sessions were equivalent. Reliability and validity coefficients were high and significantly different from zero. It was concluded that the HF E-800 could with such Ss be used with some confidence to assess high-frequency sensitivity.

Adult↗