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Biomedical subjects

F E Musiek

Publications and source records attributed to F E Musiek.

At least 55 records · Page 3Linked to original sources
PubMed1990

Canal electrode electrocochleography in patients with absent wave I ABRs.

Fifteen patients (23 ears) who demonstrated no recordable wave I at the time of clinical auditory brainstem response testing were subsequently retested under three auditory brainstem response-electrocochleography conditions. One condition was the traditional auditory brainstem response, another was the auditory brainstem response with electrocochleography filtering, and the third was an electrocochleographic condition using a canal electrode (Tiptrode). The electrocochleographic recording condition provided more readable wave I responses than the other conditions. In addition, the electrocochleographic condition provided wave I amplitudes that were greater than those of the traditional auditory brainstem response. The later waves of the auditory brainstem response (III and V) were similar in wave presence amplitudes and latencies for all three test conditions.

Adult↗
PubMed1990

Duration pattern recognition in normal subjects and patients with cerebral and cochlear lesions.

Three groups of subjects were tested on a duration pattern recognition task. The groups included normal subjects, subjects with cochlear hearing loss, and subjects with lesions involving but not limited to the auditory areas of the cerebrum. Results indicated no significant difference in pattern recognition between the normal subjects and subjects with cochlear hearing loss. However, the subjects with cerebral lesions performed significantly more poorly than either the normal subjects or those with cochlear hearing loss. In comparing pattern recognition performance for the ears ipsilateral and contralateral to the lesioned hemispheres no differences were noted. Rather, when a central lesion was present, both ears generally yielded abnormal scores.

Adult↗
PubMed1990

Improvement of central auditory function after partial temporal lobectomy in a patient with seizure disorder.

This case study reports the auditory findings in one patient with left temporal lobectomy. Behavioral and electrophysiologic central auditory tests were administered just before and 1 week after surgical removal of the left anterior temporal lobe, including the amygdala and portions of the hippocampus. The dichotic digits test and late auditory evoked potentials with P-300 showed marked improvement postoperatively, consistent with improved central auditory function. Postoperative behavioral results on the dichotic digits test are consistent with anatomic evidence that there are few, if any, auditory connections to the anterior temporal lobe. Although electrophysiologic recordings improved postoperatively, they are still considered abnormal. This case study illustrates the use of both behavioral and electrophysiologic procedures for monitoring central auditory function.

Adult↗
PubMed1990

Asymmetries of the auditory areas of the cerebrum.

A total of 29 human cadaver brains were examined for asymmetries of the left and right Sylvian fissure, Heschl's gyri, and planum temporale. The mean lengths of these structures were all significantly greater on the left side than on the right. There was considerable morphologic variability in these structures as evidenced by the number of Heschl's gyri that ranged from one to three per hemisphere in different brains, although there was no significant asymmetry in the number of Heschl's gyri in individual brains. Asymmetry of the Sylvian fissure was correlated with the greater length of the planum temporale on the left side. Although it is well known that the planum temporale is larger in the left hemisphere than in the right, little has been reported on Heschl's gyri in this regard. It is possible that asymmetries in higher auditory and language function may be attributable to anatomic asymmetries of not only the planum temporale but also Heschl's gyri.

Aged↗
PubMed1990

Objective tinnitus of vascular origin with hearing improvement after treatment.

Objective tinnitus occurs as a result of muscular contraction or vascular pulsations. The literature is reviewed and we present two case reports of vascular objective tinnitus and its diagnostic and therapeutic modalities. One patient was treated with embolization alone; the other, with embolization and surgical ligation. Both patients achieved an improvement in sensorineural hearing thresholds in their affected ears; one patient experienced an improvement in speech reception threshold of 30 decibels. Measures useful to diagnosis and evaluation of therapy and reasons for the observed improved hearing thresholds are discussed.

Adult↗
PubMed1989

The dichotic rhyme task: results in split-brain patients.

Monosyllabic rhyme words were dichotically presented to normal and complete split-brain subjects. In the normal adult population, only one of the words in the dichotic condition was identified. Hence, normal performance was about 50%, with a small but significant right-ear advantage. The split-brain patients yielded the expected marked left deficit, as seen on other dichotic speech tests, and demonstrated a right-ear enhancement, producing a large interear difference. This right-ear enhancement on the dichotic rhyme task (DRT) may suggest a release from central auditory competition in the left hemisphere. The dichotic rhyme task's normative data results and sensitivity to lack of callosal transmission make it worthy of further clinical and basic research.

Adolescent↗
PubMed1989

The auditory brain stem response interaural latency difference (ILD) in patients with brain stem lesions.

The ABR interaural latency difference (ILD) from 15 patients with brain stem lesions was compared to the ILDs from patients with VIIIth nerve tumors, cochlear pathology, and a normal control group. All patients in the study had to meet the criteria of bilaterally symmetrical hearing for pure-tone thresholds in order to offset the effect of hearing loss on the ILD. Although the ILDs for the brain stem lesion group were larger than for the cochlear or normal groups, they were significantly smaller than for the VIIIth nerve tumor group. It appears that the ILD is not as sensitive a measure for detecting brain stem involvement as VIIIth nerve tumors.

Adult↗
PubMed1989

Electrophysiologic and behavioral auditory findings in multiple sclerosis.

An auditory test battery composed of seven behavioral and electrophysiologic measures, in addition to pure tone testing, was administered to 33 subjects with definite multiple sclerosis. More than 40% of the subjects with normal peripheral hearing presented with subjective complaints of hearing difficulties. Auditory brainstem response (ABR) was found to be the most sensitive individual test in detecting central auditory dysfunction. Further analyses suggested that the combination of ABR and masking level difference (MLD) tests was essentially as effective as the entire test battery in detecting dysfunction in these subjects. Dichotic speech measures, unlike other tests, showed a definite laterality effect with the left ear consistently poorer, possibly reflecting interhemispheric involvement.

Adult↗
PubMed1988

Current concepts on the use of ABR and auditory psychophysical tests in the evaluation of brain stem lesions.

Since the inception of the auditory brain stem response (ABR) as a test of brain stem integrity in the mid-1970s, much has been learned about its advantages and limitations. Although ABR remains perhaps the best audiologic test for brain stem disorders, its sensitivity is dependent on the type and various characteristics of the lesion. Behavioral tests, especially interaural timing procedures, also appear to have reasonable sensitivity to brain stem involvement. Results from this type of procedure seem to correlate with certain ABR findings from patients with brain stem lesions. There is support for the concept that carefully selected behavioral tests can complement the ABR and provide increased overall sensitivity for the detection of brain stem dysfunction.

Adult↗
PubMed1988

Correlation of ABR and medical imaging in patients with cerebellopontine angle tumors.

In this retrospective study, 100 recently operated acoustic nerve tumors were reviewed to determine the success of the use of auditory brain stem response (ABR) as cross-check of the medical imaging studies. When the patient had sufficient hearing to obtain a diagnostic ABR (93 patients), the initial ABR was abnormal in 96.7%. However, the initial medical imaging procedure (enhanced computerized axial tomography or magnetic resonance imaging) was positive in 69% of the patients. Thus, it is recommended that the ABR be included in the evaluation of patients suspected of having acoustic nerve tumors to help in the determination of the need for additional studies. This use of the cross-check may speed the time it takes to reach a diagnosis.

Adult↗
PubMed1988

Topographic mapping of brain electrical activity in the assessment of central auditory nervous system pathology.

Topographic mapping of brain electrical activity is a method of converting electrical measurements of brain activity (evoked potential and EEG) into quantitative data that then can be displayed as colored visual maps. In this article, we review the basic principles underlying the procedures involved and then discuss their use in the assessment of central auditory nervous system (CANS) pathology. Finally, we highlight some of the limitations of the procedures as presently used.

Adult↗
PubMed1987

Audiologic and other clinical findings in a case of basilar artery aneurysm.

A patient with a large, right-sided basilar artery aneurysm was evaluated. Major symptoms included progressive hearing loss, facial numbness, occipital headaches, dizziness, and diplopia of less than a year's duration. Audiologic results indicated a low-frequency sensorineural hearing loss with marked discrepancies between ascending and descending pure-tone thresholds for the ear ipsilateral to the lesion. Auditory brain-stem response demonstrated bilateral abnormalities, but the early waves were normal. Contralateral acoustic reflexes were absent on the right and elevated on the left. Electronystagmography results showed bilaterally absent caloric responses as well as gaze nystagmus and abnormal pursuit movements. Additional audiologic results as well as radiologic and medical findings are also presented.

Aneurysm↗
PubMed1987

Central auditory assessment: thirty years of challenge and change.

In this paper we discuss some of the major developments that have occurred in the field of central auditory assessment over the past 30 years. We discuss both the psychophysical and the electrophysiological procedures that have been used for either research and/or clinical purposes. Case illustrations from our own clinical experience are also provided. Finally, we conclude by suggesting directions for future research.

Auditory Diseases, Central↗
PubMed1987

Frequency patterns in cochlear, brainstem, and cerebral lesions.

Three groups of patients with different pathologies (cerebral, brainstem, and cochlear lesions) were tested and compared for performance on frequency patterns. Results indicated that the frequency pattern test was highly sensitive to cerebral lesions (83%), but not as sensitive to brainstem lesions (45%). There was very little overlap between results of subjects with cochlear hearing loss and those with cerebral lesions. The specificity of frequency patterns for detecting cerebral lesions (the number of true negative results divided by the number of cochlear subjects) was 88.2%.

Adolescent↗
PubMed1986

Auditory brain-stem response in patients with acoustic neuromas. Wave presence and absence.

Auditory brain-stem response (ABR) waveforms from 61 patients with eighth nerve or cerebellopontine angle tumors were analyzed for wave presence or absence. Eighteen patients yielded ABRs lacking any readable waves; 27 patients revealed ABRs in which waves were partially present (ie, one or two waves present); and 16 patients demonstrated ABRs with all waves (I, III, and V) present. In the partially present ABR group, waves I and V were most prevalent. The group lacking waves (absent ABR group) had significantly poorer hearing sensitivity and larger tumors than the partial ABR group. Various additional group comparisons for hearing sensitivity and tumor size did not yield any significant differences among the three groups.

Adult↗
PubMed1986

Auditory brain stem response--interwave measurements in acoustic neuromas.

Auditory brain stem responses (ABR) of 61 patients with tumors of the VIIIth nerve or cerebellopontine angle were analyzed for latency of the I-III, III-V, and I-V interwave intervals. Of the 61 patients, 16 yielded ABR records with repeated waves I, III, and V so that interwave intervals could be measured. Results indicate that not only is the I-III interval often abnormal, but in almost 50% of the cases the III-V interval is also extended. Additional analysis included comparing a group of subjects with cochlear lesions with the 16 patients with VIIIth nerve tumors. These findings indicated a higher degree of specificity than sensitivity for the ABR interwave measurement. These findings, as well as additional analyses, are discussed.

Adult↗
PubMed1986

Neuroanatomy, neurophysiology, and central auditory assessment. Part I: Brain stem.

This paper is the first in a series of three that address neuroanatomical and neurophysiological aspects of central auditory assessment. The focus of this article is the "auditory" brain stem. Pictures of the auditory structures in the human brain stem in normal and pathological states are shown. Physiological evidence of neural coding of acoustic stimuli is discussed. Relationships between brain stem anatomy/physiology and clinical test results and their interpretation are highlighted.

Auditory Pathways↗