Objectives: Otoacoustic emissions (OAEs) are sounds that originate in cochlea and are measured in external auditory canal and provide a simple, efficient and non-invasive objective indicator of healthy cochlear function. Olivo cochlear bundle (OCB) or auditory efferent system is a neural feedback pathway which originated from brain stem and terminated in the inner ear and can be evaluated non-i...

OBJECTIVE To investigate functional magnetic resonance imaging (fMRI) in pediatric cochlear implantation candidates with residual hearing who are under sedation for evaluation of auditory function. DESIGN During fMRI, subjects heard a random sequence of tones (250-4000 Hz) presented 10 dB above hearing thresholds. Tones were interleaved with silence in a block-periodic fMRI design with 30-sec...

primary and secondary malignant central nervous system (cns) tumors are devastating invasive tumors able to give rise to many kinds of differentiated tumor cells. glioblastoma multiform (gbm), is the most malignant brain tumor, in which its growth and persistence depend on cancer stem cells with enhanced dna damage repair program that also induces recurrence and resists current chemo- and radio...

A systematic evaluation of the influence of different averaging methods on the quality of recorded auditory brain stem responses is performed on a single sweep basis, i.e., on a post-hoc analysis of all unaveraged single epochs. The question of an optimal averaging method is addressed. Single sweeps of auditory brain stem responses were recorded to monaural and binaural click stimuli at levels ...

To test the hypothesis that there would be a positive correlation between the interpeak wave (I-V) interval as measured by auditory brain stem evoked response and the ratio of umbilical cord blood arterial to venous lignocaine concentrations in infants born after maternal epidural anaesthesia, 10 normal infants born at full term by elective caesarean section were studied. Umbilical cord arteria...

Background: Bilateral hearing impairment is rare in vertebrobasilar occlusive disease. Summary ofComment: Between 1986 and 1991, we encountered seven patients (four men, three women; median age, 61 years; range, 46-71 years) who had sudden bilateral hearing impairment among 503 patients with vertebrobasilar occlusive disease. The main initial neurological symptoms were sudden bilateral hearing ...

OBJECTIVE To assess the diagnostic efficiency and costs of protocols used for investigating patients with suspected lesions of the cerebellopontine angle. DESIGN Prospective evaluation of tests of auditory brain stem responses and acoustic reflex thresholds, electronystagmography, and calorics. Positive test results were confirmed or refuted by high resolution computed tomography with intrave...