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Results for “Recruitment Detection, Audiologic”

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PubMed1986

[Dynamics of the recruitment phenomenon in chemical industry workers].

The state of auditory function, the changes in the over-threshold tests for recruitment phenomenon respectively, characteristic for the affection of the sound-receiving links of the auditory analyzer, have dynamically been observed (at interval of 3 to 6 months) among 100 workers from chemical industry. In addition of the otorhinolaryngological examination and acoumetric study of hearing acuity, some tonal threshold and over-threshold audiometric examinations have been performed. A definite correlation has been established between the changes in the hearing function and the length of service of the workers. The data about the over-threshold studies reveal that the tests for recruitment phenomenon become more often positive in the workers, being organic solvents, paints and varnishes. The auditory disorders were observed in the region of high frequencies, being with sound-receiving character. The test of Carhardt became positive rather early, interpreted as early disorder of the processes of adaptation. The approaches of the early diagnostics of hearing disorders are presented as a result from the study.

Adult↗
PubMed1985

Ménière's syndrome.

A patient complaining of dizziness, deafness, and tinnitus often brings a feeling of despondency to the doctor. Together the symptoms may arise from Ménière's syndrome, a condition that eludes firm diagnosis, is without known cause, and cannot yet be cured. Consequently, discussion and disagreement about the disease is common and some of these aspects are outlined here.

Audiometry, Evoked Response↗
PubMed1979

[Objective diagnosis of recruitment by brainstem audiometry (author's transl)].

The differential diagnosis in cochlear damage with brainstem potentials is easily done by looking for normal latencies that coincide with substantial hearing loss. Further validation can now be achieved with methods representing Fowler and SISI test equivalents. Amplitudes of brainstem potential were compared in 28 patients with marked differences of hearing loss in either ear. Amplitudes are balanced at the stimulus intensity corresponding to subjective loudness balance (Fig. 3). Intersubject comparison of input/output function steepness is not advisable because of the greater interindividual variation of amplitudes (Fig. 2). Amplitude modulation by short Gauss-shaped increments (Fig. 1) or by decrements of a continuous tone evokes clear brainstem potentials at thresholds of about 5dB above subjective detection, but it also depends upon stimulus duration or steepness (Fib. 4), frequency (Fig. 5) and the degree of modulation (Fig. 6). With a cochlear hearing loss of more than 40dB, a 1 dB increment evokes potentials for continuous tone intensities higher than 20 dB above subjective thresholds (Fig. 7). This test is mainly useful for children with retarded language development and lacking a stapedius reflex, for adults, who cannot sufficiently cooperate, and where there is a prolonged latency due to middle ear damage or a steep high frequency loss.

Audiometry↗
PubMed1979

Reflex modulation and loudness recruitment.

Eyeblink reflexes to airpuffs to the orbit are inhibited by preliminary tones even of low intensity, and the amount of inhibition or "reflex modulation" (RM) is correlated with tone loudness. Brief pure tones were presented 100 msec prior to an airpuff to the eye and eyeblink amplitude was recorded in 7 normal-hearing adults. Tones of several levels were either in quiet or in a white noise of 73.5 dbC. As tones increased in intensity, RM increased faster to stimulation in the masked than in the unmasked ear, simulating the classical "pseudo-recruitment" in the noise-masked ear. In addition, very rapid growth of RM was found at 4 kc/s in a patient with sensorineural impairment of 70 db at that frequency as compared with the RM from a frequency with normal HTL. These data confirm the potential of RM in the objective quantification of loudness recruitment.

Acoustic Stimulation↗
PubMed1980

[Binaural summation of the ipsilateral and contralateral acoustic stapedius reflex (author's transl)].

The binaural summation of the simultaneous contra- and ipsilateral acoustic stapedius reflexes was examined in 20 normal-hearing patients. In these patients, the effect of summation was most pronounced with subthreshold intensities. A contralateral reflex was increased by ipsilateral intensities 8 db below threshold. A reflex could also be elicited by binaural intensities which were contra- and ipsilaterally 4 db below threshold. As a result of our studies, we recommend a revision of the definition of a positive Metz-recruitment. Because of possible binaural summation effects, the absolute value of the contralateral stapedius reflex threshold should not exceed 105 db HL in spite of possible sensorineural hearing loss.

Acoustic Impedance Tests↗
PubMed1983

[Is there noise-induced hearing loss in the low and middle tone frequencies?].

Statistical material was collected on over 1000 patients with noise-induced hearing loss (expert opinions on these patients). All those patients were excluded who showed any other cause for their hearing loss i.e. head trauma, mumps, ototoxic medication, family history of hearing disease, or other causes. 200 patients showed loss of hearing at 250 Hz and 500 Hz of 20 dB or more and at 1000 Hz a hearing loss of at least 30 dB. Several matched-pair investigations with great variability of hearing loss are given. There is substantial evidence to prove that noise may damage the lower and medium frequencies as well as the higher frequencies.

Adult↗