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Biomedical subjects

P Feblot

Publications and source records attributed to P Feblot.

17 recordsLinked to original sources
PubMed1985

[Early brain stem auditory evoked potentials in brain death].

Brain-stem auditory evoked potentials (BAEPs) are realized after the first flat EEG in 50 patients. BAEPs were absent in 70% of the patients. In 22% of the patients, one- or two-sided peak I persists. In 8% the peaks I, II and IV exist after the first flat EEG. BAEP evolution with the course of time is realized. A complete disappearance is established after 24 h. The useful advantage of BAEPs in the early diagnosis of brain death is discussed.

Adolescent↗
PubMed1981

[Rapid derived auditory evoked potentials].

Brain stem auditory-evoked responses to a 70 dB SL click masked by high-passed noises were recorded in 12 normal hearing subjects. By applying the technique of derived potentials, the contribution of one-octave-wide frequency bands are assessed. Summation of these derived potentials gives a pattern similar to the unmasked-response waveform. Waves I and III show a strong predominance of high-frequency responses, whereas wave V is discernible down to low-frequency responses.

Adult↗
PubMedDate not supplied

[Objective audiometry by recording of early and middle-latency auditory evoked potentials using an external method].

The bio-electric potentials induced by a stimulus in the cochlea and the various structures of the auditory pathways of the brain stem and the primary auditory cortex may be collected using an external method. The authors frequently emply in clinical practice early components, which correspond to the cochlea response in the cochlear nucleus of the medulla, in the olive of the pons and the posterior quadrigeminal tubercle, and middle latency components, sub-cortico-cortical potentials generated in the thalamus and the primary auditory cortex. Combined use of early and middle latency components makes it possible, without preparation and with simple sedation in the child, to obtain an objective determination of threshold. In oto-neurology, this examination provides appraciable information concerning lesions in the auditory pathways: acoustic neuroma, brain stem tumour, multiple sclerosis, central deafness in patients with cerebral motor insufficiency.

Acoustic Stimulation↗
PubMedDate not supplied

[Using brainstem auditory evoked potentials in cerebellopontine angle tumors (author's transl)].

The brainstem electric responses on acoustic stimulation are recorded on 37 patients with verified cerebellopontine angle tumors. These responses are compared with those of 101 normal hearing young adults and those of 47 patients with cochlear hearing loss. The Interval between the latency of the first wawe (acoustic nerve) and the fifth (midbrain) or I-V delay is related to the lesion location. The I-V delay is increased in retro-cochlear hearing loss and not different of the normal in cochlear hearing loss. The delay variation is best seen by comparing the I-V delay for the two ears. The interaural I-V delay difference (ITI-V) is normally less than 0,3 msec and is greater than or equal to 0,35 ms in the tumor group. The use of ITI-V increases the reliability of the test. We have neither false positive nor false negative findings. We now use brainstem electric responses as a routine part of our office practice of neuro-otology.

Adult↗