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Biomedical subjects

B Koefoed-Nielsen

Publications and source records attributed to B Koefoed-Nielsen.

8 recordsLinked to original sources
PubMed2000

[Results and experiences with 55 cochlear implantations].

INTRODUCTION: The etiology of deafness in deaf people is defects in the cochlea hair cells. Cochlear implant treatment gives deaf born and patients with acquired deafness the possibility to reestablish or obtain hearing by electric stimulation of the cochlear nerve. In this paper the results of treatment of 35 adults and 20 children are reported. METHOD: The candidates for cochlear implant treatment are extensively investigated before the decision is made to operate. The operative treatment takes place under general anaesthesia and the operative technique is outlined. In the treatment of the deaf, different types of implants and stimulation strategies have been used. The effect of treatment is considered by hearing test and evaluation of speech. RESULTS: Nine of the adults obtained a hearing quality that made using a telephone possible. Almost all adults can by the combination of cochlear implant and lip reading perform a normal conversation. The results in the deaf born children are obtained slowly as the deaf born have to develop hearing and speech from zero. All the treated children have improved possibilities of communication. DISCUSSION: Cochlear implant treatment of deaf people now seems well established both internationally and nationally in Denmark. Cochlear implant equipment has improved considerably throughout the past years and that it today is possible to establish hearing in deaf born or patients with acquired deafness can be considered as one of the greatest developments in otology, maybe the greatest.

Adolescent↗
PubMed2000

Results and experience of 50 cochlear implant operations.

Cochlear implantation (CI) is a relatively new type of treatment that aims to re-establish hearing in deaf people. This paper reports on the results from CI operations on 34 adults and 17 children. All patients benefited from the treatment. The adults' communication with other people improved. Almost all patients use their implant 16 h a day and some of them are able to communicate by telephone. Among children the results show that the treatment is safe, as no complications have developed. Hearing and speech improved in all children, and thus also their ability to communicate. The results obtained are dependent on the individual patient's condition, the time of operation in relation to the development of deafness, and the type of CI used. CI treatment of deaf people may be considered to be one of the greatest advances in otology.

Adolescent↗
PubMed1993

Allergy caused by light-cured ear-moulds.

This investigation was conducted after the occurrence of allergic contact dermatitis in three laboratory technicians all engaged in the production of UV-light-cured acrylate ear-moulds. Ninety patients fitted with such moulds claimed discomfort to the same extent as patients with traditionally made acryl moulds. Of thirteen patients seen for clinical examination, seven were tested for allergy in the same way as the technicians and four were found to be sensitized to monomere metacrylates in the wax. The handling of the base materials in the laboratory as well as the UV-light-curing procedure needs further investigation.

Acrylates↗
PubMedDate not supplied

Mechanics of the middle ear system: age-related changes in viscoelastic properties.

Morphological studies of age-related changes in the tympanic membrane have suggested a decreased elasticity for increasing age, whereas age-related changes in admittance measured by tympanometry have revealed inconsistent results. In this study we report on the viscoelastic properties of the middle ear system by means of a new method in two different age groups. This method measures hysteresis (microJ), which describes the viscous properties of the system, and compliance (mm(3)/kPa) reflecting its elasticity. Moreover, P(ec0) (kPa) was recorded, which corresponds to middle ear pressure measured by tympanometry. Recordings were made in a group of 30 older normal subjects (mean age 77 years) and results were compared to previous findings in a group of 39 younger normal subjects (mean age 29). Hysteresis was markedly decreased in the older normal group compared to the younger one (p = 0.057). This may reflect morphological changes previously reported in the tympanic membrane and can be related to theoretical considerations on tympanic membrane rupture pressures. Compliance and P(ec0) were not influenced by variation in age (p = 0.645 and 0.966).

Acoustic Impedance Tests↗