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At least 487 records · Page 27Linked to original sources
PubMed1979

Impedance audiometry in a young population. The effect of age, sex, and tympanogram abnormalities.

Static compliance, and acoustic reflex thresholds, were studied retrospectively in 883 subjects, aged one to 20 years. Age was a factor in both measurements. In 523 subjects with normal middle ear fuction, static compliance increased as a function of age. Acoustic reflex thresholds for pure tone signals improved with age, while acoustic reflex thresholds for broad band noise (BBN) tended to decrease. Minor tympanogram abnormalities exerted a distinct influence on static compliance and acoustic reflex thresholds. Static compliance was increased, and highly variable, in 93 subjects with A-deep tympanograms. In 212 subjects with either A-deep tympanograms, or slight negative pressure (i.e. -50 to -100 mm H2O), acoustic reflex thresholds were elevated for both pure tone, and BBN signals. In 132 sensorineural impaired subjects, the sensitivity loss differentially affected acoustic reflex thresholds for pure tone vs BBN signals. In view of the potential influence of age, and, especially, minor middle ear abnormalities, on static compliance and acoustic reflex measures, these factors should be seriously considered when interpreting impedance audiometry findings in children.

Acoustic Impedance Tests↗
PubMed1982

Volume measurement of middle ear and mastoid air cell system with impedance audiometry on patients with eardrum perforations.

The usefulness of the electroacoustic impedance bridge with a probe tone frequency of 0.22 kHz in the determination of the middle ear and mastoid volumes was evaluated in patients with dry eardrum perforations. The values obtained were compared with the volumes determined by an aspiration technique utilizing the gas laws. Also, a comparison was made between the impedance volumes and the size of the mastoid air cell system as measured on x-ray film in a lateral projection. A significant agreement between the two methods of direct volume determination was found. A good relationship was found between the impedance volume and the mastoid air cell area. The impedance audiometry enables a rapid and valuable estimation of the air reservoir in the middle ear in patients with eardrum perforations.

Acoustic Impedance Tests↗
PubMed1995

[Effect of linguistic competence on speech audiometry results using the Basel Sentence Test].

Linguistic competence, such as a mental lexicon knowledge of syntactic rules of the language and the use of semantic constraints, may impact central speech processing and play an important role in speech recognition. The influence of linguistic ability on speech understanding was investigated using the Basel Sentence Understanding Test. The subject's linguistic ability was determined based upon educational background (elementary school, high school and or university) and intelligence quotients (IQ) based on the reduced version of the Hamburg-Wechsler Intelligence Test. Forty normally-hearing subjects listened to five test forms of the Basel Sentence Understanding Test. Each test form comprised a fraction of 15 low-predictable (LP) test items and 15 high-predictable (HP) test items based on the amount of contextual information in the phrases. No effect of educational background and IQ-value could be demonstrated on the scores of LP sentences. However, there was a small but significant influence of educational background and IQ-value on the scores of HP sentences. The implications of these findings on clinical speech audiometry are discussed.

Adult↗
PubMedDate not supplied

[Topographic diagnosis of hearing loss in patients with ischemic heart disease. Use of high-rate brain stem evoked response audiometry].

Hearing loss in patients with ischemic heart disease traditionally has been attributed to atheromatous cerebral vascular disease. In this study, the site of the auditory lesion was sought in patients with ischemic heart disease and perceptive hearing loss. Standard brainstem evoked response audiometry (BSER) with increased stimulation rate (ISR) were performed. Sixty-seven patients admitted for coronary artery disease were examined. Fifty-seven recordings were complete and evaluable. All the cases of hearing loss were endocochlear. In 4 patients. BSER and ISR detected subclinical retrocochlear lesions that were compatible with ischemic disease. The results suggest that selective early cochlear ischemia can occur in young persons with heart disease. The sensitivity of BSER with ISR for detecting ischemic brainstem lesions was confirmed.

Adult↗
PubMed1977

[Quantitative studies on recruitment in objective audiometry with evoked potentials and the relationship to Fowler's loudness test].

Recruitment of loudness in patients with unilateral sensorineural hearing loss--an abnormal subjective sensation-is quantitatively measurable by means of objective audiometry with auditory evoked potentials without patients' help. Recruitment measure subjectively and objectively corresponds quantitatively. The only diminution of the latency of the evoked potential in comparison to the latency of a standard group is not proof of an existing recruitment.

Auditory Perception↗
PubMed1985

Low-frequency sensorineural hearing loss. Brainstem response, speech and high-frequency audiometry.

Four cases of acquired, unilateral sensorineural hearing loss are presented. The low-frequency octave threshold changes are considered compatible with the low-frequency tails of neurons with characteristic frequencies of 2, 4 and 9 kHz. Zero speech discrimination was found in two patients with high-frequency threshold preservation at and above 4 kHz. Normal auditory brainstem responses were obtained in the two patients with low-frequency hearing loss confined to the frequency bands below 2 and 4 kHz respectively. Only wave I could be reliably identified in the two patients with single frequency threshold preservation at 2 and 9 kHz, while both presented a second, low amplitude wave with latency corresponding to our normative values for wave V. The latter may represent a delayed and pathological wave III.

Adolescent↗
PubMed1980

Speech, impedance, and auditory brainstem response audiometry in brainstem tumors. Importance of a multiple-test strategy.

Speech, impedance, and auditory brainstem response audiometric data were determined for four patients with intracranial tumor. Although the results of any individual measure may be ambiguous, consideration of the overall pattern of results on all three measures, in combination with audiometric sensitivity level, can lead to relatively precise site localization of brainstem auditory disorders.

Acoustic Impedance Tests↗