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Results for “VESTIBULAR FUNCTION TESTS”

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PubMedDate not supplied

Electrocochleography used as a clinical hearing test in difficult-to-test children.

Thirty difficult-to-test children have been tested with transtympanic ECoG. When possible, informal hearing tests and/or free-field testing were performed. Children in whom no action potential (AP) could be recorded were submitted to conventional radiography of the inner ear, and vestibular tests. The correlation between free-field test thresholds and AP "thresholds" was good, especially in subjects with relatively good hearing. Response amplitude increased, and latency decreased, with increasing frequency of the stimulus implying that different parts of the basilar membrane are stimulated according to the frequency of the stimulus. Input-output curves of response amplitude and latency were plotted, and three different types were distinguished. ECoG can contribute to the evaluation of peripheral hearing in difficult-to-test children, and vestibular tests should always be performed on a child with suspected deafness or sensorineural hearing loss. Conventional radiography of the inner ear, however, seems to be of little value.

Action Potentials↗
PubMed1995

Hyperactive VOR and hyperventilation after whiplash injury.

Otoneurological and respiratory tests were performed on 32 patients after whiplash injury caused by a rear-end car collision. Oculomotor and cervico-ocular test results were generally normal. In a significantly large number of case, the vestibulo-ocular reflex (VOR) was hyperactive (n = 17; 53%) and the respiratory test results were typical of the hyperventilation syndrome (HVS) (n = 12; 38%). Hyperactive VOR and the HVS occurred significantly more often in combination (n = 7; 22%) than could be accounted for by combined false positivity. Most of the significant findings were due to high relative frequencies in the women. The hyperactive VOR might have been the result of plastic adaptation to limited head mobility secondary to neck pain. Behavioural and emotional distress might offer alternative explanations for both the hyperactive VOR and HVS.

Adult↗
PubMed1978

[Audiogram-analogue representation of the vestibular reaction to caloric stimulation (author's transl)].

A new diagram with audiogram-like presentation of the vestibular reaction to caloric stimulation is proposed, which facilitates the identification of typical vestibular disorders. Spontaneous nystagmus with the relevant parameters is entered in the chart. The diagram can be used for any parameter of the reaction, such as frequency, slow phase velocity or total amplitude in a defined period of time, e.g. 30 sec of maximal reaction.

Adult↗
PubMed1985

Vestibular responses to different caloric stimulus intensities.

Data are presented concerning stimulus response relationships to weak (44 degrees C) and strong (0 degrees C) caloric stimuli. In clinically hypoactive ears the response to the strong stimulus is not equivalent to the response to the weak stimulus for evaluating hypoactivity when using the usual percentage formula. The ratio of responses to strong and weak stimuli in the hypoactive ear is greater than in the better ear. The absolute differences in mean eye speed response to strong and weak stimuli are the same for hypoactive and better ears as for hypoactive and probably normal groups. A hypothetical schema is described to explain these relationships involving alteration of tonic balance between the two ears in the presence of central compensation. The effect of directional preponderance on stimulus response relationships is described. It is suggested that differences in absolute mean eye speed values in group analysis are the true measure of gain due to the stronger stimulus and are more valid for determining stimulus response relationships between stimuli of differing intensities than the ratio of these means. Using this criterion, no evidence of recruitment was found in the ears described. The concept of vestibular recruitment and decruitment in terms of caloric test characteristics is discussed and the appropriateness of these terms is questioned.

Caloric Tests↗