Biomedical subjects

K Burian

Publications and source records attributed to K Burian.

At least 55 records · Page 3Linked to original sources

PubMed1979

Investigations towards an artificial cochlea.

Two versions of multichannel cochlear stimulators have been implanted, one allowing stimulation against a common distributed ground within the cochlea and the other allowing bipolar stimulation. The results obtained indicate that with both versions sufficiently discrete stimulation of the auditory nerve is possible in order to be able to make use of tonotopy for the processing of speech. The bipolar stimulation, however, besides of being characterized by higher thresholds than unipolar stimulation, also leads to a very narrow range of stimulus frequency within which perceived pitch is influenced by stimulus frequency. Surprisingly different psychophysical behaviours are exhibited by the two subjects considered, one being a case of prelingual, the other of acquired deafness. This indicates the marked influence which etiology of deafness might have on design considerations for auditory prostheses.

Acoustic Stimulation↗

PubMed1976

[The actual stage of objective audiometry (ERA) (author's transl)].

Evoked Response Audiometry (ERA) comprises a few electrophysiological tests utilizing acoustic evoked potentials as a audiometric criterion. Some potentials with different latencies (early, late and very late potentials) which are mainly used in routine audiometry are reviewed, the practical procedure of the tests (Electrocochleography, Cortical Audiometry and CNV-Audiometry) as well as their results are discussed. Today objective audiometry should be a clinical routine examination which can provide additional and more information than conventional audiometry.

Audiometry↗

PubMed1976

[Hemangioma simplex of the larynx in an infant (author's transl)].

Symptoms of inspiratory stridor, dyspnoa and cyanosis appeared in a four month old boy. After the direct laryngoscopy and biopsy a hemangioma simples of the larynx was diagnosed. The tumor itself was successfully treated by cryosurgery. The advantages of this therapy were pointed out and the cryosurgery can be recommended in cases of larynxangioma.

Cryosurgery↗

PubMed1975

[Comparison of two different recording sites in electrocochleography: promontory and external mastoid position (author's transl)].

One possible evaluation of the functional unit: hair-cell/afferent neurit is the recording of an action-potential (AP) from the acoustic nerve. The authors report their experience in recording the AP from an external position on the mastoid planum and from a transtympanic position on the promontory. The promontory site is prefered because of the higher electrical response amplitude and because of its relatively reduced sensitivity against myogenic potentials. Characteristic findings in normal ears and in some pathological conditions are to be demonstrated.

Action Potentials↗

PubMed1975