Biomedical subjects

C Haferkamp

Publications and source records attributed to C Haferkamp.

6 recordsLinked to original sources

PubMed2000

[Angiosarcoma of the frontal sinus. Case report and review of the literature].

Angiosarcomas are very rare but highly malignant soft tissue tumors derived from the vascular endothelium. The tumor is most commonly found in the skin. The cancer is known to cause early and widespread metastases leading to a very poor prognosis of less than 24 months. The therapy of choice is radical surgery followed by adjuvant radiation. In this case study, we report on a patient with a very unusual localization of angiosarcoma in the frontal sinus. Based on this case, we discuss important aspects of tumor biology, diagnostic procedures, and histologic features as well as therapeutic options. We conclude that angiosarcoma has to be considered by a differential diagnosis in all head and neck neoplasias with uncertain histology.

Adult↗

PubMed2000

[Hybrid 3D visualization and virtual endoscopy in cochlear implants].

PURPOSE: The aim of this study was to demonstrate on a complex anatomical structure the possibilities and the advantages of a superimposition of a color-coded surface and volume rendering (hybrid rendering) method with the possibility of the performance of a virtual endoscopy. MATERIAL AND METHOD: In 6 patients with cochlear implants a high-resolution spiral computed tomography of the petrous bone was performed. The cochlear implants, the middle and inner ear structures were visualized using a color-coded surface rendering method, either shaded or as a grid. The petrous bone was visualized using a transparent volume rendering method. RESULTS: The hybrid 3D visualization uses the advantages of both the color-coded 3D surface and volume rendering method. In comparison to the axial source images, the hybrid 3D visualization thus facilitates a clearer representation and better assessment of the complex topographical relationship without loss of diagnostic information. The virtual endoscopy facilitates an intraluminal visualization and inspection of all color-coded 3D surface- and volume rendered structures. CONCLUSIONS: The hybrid rendering and virtual endoscopy make the morphological assessment of cochlear implants easier by the simultaneous visualization of the surrounding structures and thereby support the diagnostic imaging methods. This image processing method can be used pre-operatively for the individual planning, simulation, training and further development of surgical procedures and interventions and post-operatively for the control of the position and further developments of implants.

Adolescent↗

PubMed1999

[Cochlear prosthesis implantation in superficial leptomeningeal hemosiderosis].

Superficial leptomeningeal hemosiderosis is a rare disease of the central nervous system. Chronic bleeding into the subarachnoid space causes deposition of hemosiderin in glial cells and subsequent damage to adjacent brain tissue. There is a characteristic predilection for the cerebellum and eighth cranial nerve. Accordingly, among a variety of symptoms, cerebellar ataxia and sensorineural hearing loss progressing to total deafness commonly occur. To date, the hearing loss has been believed to be purely neural. We present a case of superficial hemosiderosis in a patient with total deafness who was successfully provided with a cochlear implant. Audiometry demonstrated total bilateral cochlear hearing losses but with preserved function of the eighth cranial nerve. These findings make us conclude that in contrast to current opinion, superficial hemosiderosis can initially damage the cochlea alone. Thus, patients with total deafness due to this disorder may benefit from cochlear implantation. All patients require careful audiometric assessment, including promontory stimulation.

Adult↗

PubMed1997

Rheumatoid arthritis: autoreactive T cells recognising a novel 68k autoantigen.

OBJECTIVE: A 68k autoantigen has been identified by specific antibodies from patients with rheumatoid arthritis (RA). This study considered whether or not this antigen is a target for T cells and thus may play a part in T cell mediated immunopathology of active RA. METHODS: The 68k antigen was isolated and used in a nitrocellulose bound form to stimulate T cells. Proliferation of T lymphocytes of peripheral blood as well as synovial fluid was measured. RESULTS: Peripheral blood T cells specifically proliferating against the 68k antigen were detected in 19 of 27 patients with RA (70%). For T cells isolated from peripheral blood, proliferation peaked on day 10. When T cells were isolated from actively inflamed synovial fluid, the proliferation kinetics shifted to a peak on day 3. Blockade of HLA class II antigens resulted in an increase of proliferation in the case of HLA-DP. Applying HLA-DP specific antibodies capable of inhibiting antigen presentation mediated by this molecule, T cells of 17 of 27 RA patients (63%) proliferated to a higher extent than with the 68k antigen alone. The phenomenon that an increased proliferation occurred upon blockade of a particular HLA class II family member was also demonstrated for DQ and DR: the 68k antigen likewise stimulated T cells restricted for DP or DQ, respectively. CONCLUSIONS: The novel 68k antigen is a target of both T and B cellular immune responses and as such could play a part in the immune dysfunction of RA. The finding that blocking of certain HLA class II molecules functioning in antigen presentation (for example, via HLA-DQ) results in a higher instead of lower proliferation in vitro, may argue for the presence of antigen specific suppressive T cells.

Adult↗

PubMed1975

[Granulocyte dysfunction. I. Inborn defects (author's transl)].

The insight in the function and dysfunction of granulocytes lately arouses more and more interest. This report summarises our present knowledge. In the first of two chapters the authors review the molecular basis of granulocyte function and the inborn defects of chemotaxis, opsonisation, phagocytosis and intracellular killing of bacteria and fungi.

Agranulocytosis↗

PubMedDate not supplied

Comparison of the TEMPO+ ear-level speech processor and the cis pro+ body-worn processor in adult MED-EL cochlear implant users.

A study was conducted to compare the new MED-EL TEMPO+ ear-level speech processor with the CIS PRO+ body-worn processor in the COMBI 40/COMBI 40+ implant system. Speech tests were performed in 46 experienced subjects in two test sessions approximately 4 weeks apart. Subjects were switched over from the CIS PRO+ to the TEMPO+ in the first session and used only the TEMPO+ in the time between the two sessions. Speech tests included monosyllabic word tests and sentence tests via the telephone. An adaptive noise method was used to adjust each subject's scores to approximately 50%. Additionally, subjects had to complete a questionnaire based on their 4 weeks of experience with the TEMPO+. The speech test results showed a statistically significant improvement in the monosyllabic word scores with the TEMPO+. In addition, in the second session, subjects showed a significant improvement when using the telephone with the TEMPO+, indicating some learning in this task. In the questionnaire, the vast majority of subjects found that the TEMPO+ allows equal or better speech understanding and rated the sound quality of the TEMPO+ higher. All these objective and subjective results indicate the superiority of the TEMPO+ and are mainly attributed to a new coding strategy called CIS+ and its implementation in the TEMPO+. In other words, based on the results of this study, it appears that after switching over from the CIS PRO+ to the TEMPO+, subjects are able to maintain or even improve their own speech understanding capability.

Adult↗