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Biomedical subjects

A Karczag

Publications and source records attributed to A Karczag.

13 recordsLinked to original sources
PubMed1988

Unanswered questions concerning the indication for cochlear implant.

In a discussion of the function of cochlear implant (CI), the following criteria should be mentioned: (1) If possible, all deaf persons (including the prelingually deaf and children) should benefit from CI. (2) Since the number of patients with late deafness is doubtlessly decreasing with better prevention and medical care (elimination of ototoxic damage, decrease of iatrogenic deafness), the percentage distribution of the deaf will be displaced in favor of the prelingually deaf. At present, the ratio of cases of late deafness to those of prelingual deafness among our CI candidates is 1:3. (3) The objective of CI must be to provide the advantage of the procedure to children as early as possible. This means that under certain circumstances a technique that is as low in risks as possible and with a handy implement should already have been used in patients at the age of 3 to 4 years.

Adaptation, Psychological↗
PubMed1986

Extracochlear sixteen-channel electrode system.

This article summarizes 10 years of work by the Cologne-Düren Research Group. The purpose of our research was to develop a noninvasive operation technique and to avoid opening the inner ear cavities (extracochlear technique). On the basis of empiric experience, a 16-channel electrode system was developed. The electrodes were fixed on a "hedgehog" contact plate with an arrangement corresponding to the projection of the cochlea. A microprocessor, which enables individual programmability in the different groups of deaf persons (prelingual, postlingual deafness), was integrated into the speech processor. Experience to date was summarized in statistical data. Not only the results of the psychoacoustic tests, but also the applicability of the cochlear implant as seen by the patients were considered. We next plan to miniaturize the system.

Adolescent↗
PubMed1985

Extracochlear eight-channel electrode system.

The Cologne-Düren research group has developed a new extracochlear eight-channel electrode system. The first observations on six cases have shown encouraging psychoacoustic results.

Acoustic Impedance Tests↗
PubMed1984

Cochlear implants. Selection of patients.

Apart from detailed clinical ENT investigations on the indication for cochlear implant, we considered the following conditions and corresponding preliminary investigations to be indispensable: (1) confirmation of diagnosis of complete deafness, (2) the detection of sufficiently functional auditory nerve fibers, (3) clarification of the sociocultural conditions of the patient, (3.1) family conditions; possibility of auditory training at home, (3.2) psychological state, motivation for auditory training, and (3.3) degree of intelligence. Individual points are explained in accordance with our statistical data.

Adolescent↗
PubMed1984

Cochlear implants. Clinical results: the rehabilitation.

In principle, an acoustic contact with the environment can be achieved in all cochlear implant patients. However, the results vary greatly in our 37 surgically treated cases. On average, our patients can (1) perceive background noises, (2) recognize different human voices, (3) differentiate differences in pitch, (4) improve lip reading and (5) improve pronunciation appreciably. (6) In addition, closed speech is largely understood. Apart from these average values, we were able to observe a beginning of open speech in 20% of the cases (simple sentences from everyday speech). A precise statistical documentation is presented with an evaluation table we have elaborated. The results of comparison between the pre-lingual and post-lingual patients are analyzed statistically. The special significance of subjective evaluation of the advantages of cochlear implant on the part of the patients is pointed out. The lower age limit in our patient material is 10 years.

Auditory Perception↗
PubMed1982

[Contribution with regard to the standardization of the terminology, the data and the rehabilitation program in cochlear implant research].

In the Field of Cochlear Implant Research the new terms are presented in a number of different ways. Further the achieved results have been based on varying data, making a comparison extremely difficult when not impossible. The contributors to this publication attempt to standardize the terminology, electrical data, and the evaluation of the hearing result, in order to achieve an objective comparison.

Audiometry↗