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Biomedical subjects

K Unger

Publications and source records attributed to K Unger.

At least 19 recordsLinked to original sources

RET rearrangements in post-Chernobyl papillary thyroid carcinomas with a short latency analysed by interphase FISH.

Tissue samples from 13 post-Chernobyl childhood thyroid tumours that occurred within a short period of time (4-8 years) after the Chernobyl accident have been investigated by interphase FISH analysis for rearrangements of RET. In all, 77% of cases showed RET/PTC rearrangements and a distinct intratumoural genetic heterogeneity. The data were compared to findings on 32 post-Chernobyl PTCs that occurred after a longer period of time (9-12 years) after the accident. In none of the cases from either group were 100% of cells positive for RET rearrangement. In addition, the pattern of RET-positive cells was different in the two groups (short vs longer latency). A significant clustering of aberrant cells could be detected in the long-latency subgroup, whereas the aberrant cells were more homogeneously distributed among the short-latency tumours. The findings suggest that oligoclonal tumour development occurs in post-Chernobyl PTCs. This pattern of different clones within the tumour appears to become more discrete in cases with longer latencies, suggesting either outgrowth of individual clones or development of later subclones with time.

Adolescent↗

Micellar electrokinetic capillary chromatography for therapeutic drug monitoring of carbamazepine and its main metabolites.

In carbamazepine (CBZ) therapy the concomitant monitoring of concentrations of CBZ and its metabolites is strictly recommended, primarily to avoid toxic side effects. Currently, clinical routine monitoring of CBZ is accomplished by high-performance liquid chromatography or immunological methods. In this study a micellar electrokinetic capillary chromatographic (MECC) method was developed for routine drug monitoring of CBZ and its main metabolites, carbamazepine 10,11-diol and carbamazepine 10,11-epoxide, in human serum or plasma samples. The MECC method enabled baseline separation of all analytes within 2.5 min. The assay revealed sufficient precision and sensitivity and the results of either an automated HPLC or the MECC chromatography assay were in good agreement (r=-0.97). The maximum deviation for CBZ was 0.26 microM.

Anticonvulsants↗

Tunica vaginalis blanket wrap to prevent urethrocutaneous fistula: an 8-year experience.

An 8-year review of hypospadias repair in patients with a meatus proximal to the coronal margin is reported. Fistula rates were compared among 4 groups: 1) loupe magnification, 2) tunica vaginalis blanket wrap tissue interposition with loupe magnification, 3) operating microscope magnification and 4) tunica vaginalis blanket wrap tissue interposition in conjunction with operating microscope magnification. Rate of fistula formation with loupe magnification alone was 20%, microscope magnification alone was 12% and tunica vaginalis blanket wrap interposition with loupes was 9%. When tunica vaginalis blanket wrap tissue interposition was used in conjunction with intraoperative microscopy no fistulas resulted.

Child↗

Inflammatory pseudotumor of the anterior orbit. A symptom in allergic granulomatous angiitis (Churg-Strauss syndrome).

Allergic granulomatosis accompanied by angiitis (Churg-Strauss syndrome) constitutes an unusual disorder which is characterized clinically by bronchial asthma and hypereosinophilia, accompanied by systemic symptoms of histopathologically and by necrotizing vasculitis, extravascular granulomas and tissue infiltration by eosinophils. We report a case of a 4 year-old child presenting with acute pneumonia and deteriorated general condition. The biopsy of an inflammatory pseudotumor of the right anterior orbit revealed necrotizing vasculitis, extravascular epitheloid granuloma and eosinophilic tissue infiltration. These are characteristic changes of allergic granulomatous vasculitis (Churg-Strauss syndrome. Laboratory findings were characterized by blood eosinophilia, increased IgE value and the presence of antineutrophil cytoplasmic ant antibodies (p-ANCA). Local and systemic manifestations quickly regressed after parenteral application of corticosteroids. Two exacerbations of inflammatory pseudotumor occurred after reduction of the corticosteroid dosage. Systemic vasculitic syndromes are rare in childhood. Orbital manifestations in Churg-Strauss syndrome in childhood have never been reported.

Biopsy↗

Preparation and use of polyphosphate-modified zirconia for purification of nucleic acids and proteins.

Polyphosphates of chain lengths between 3 and 100 were coupled to porous zirconia particles and used for affinity chromatography of nucleic acids and proteins. It is demonstrated that single-stranded RNA and DNA are strongly retained on the polyphosphate-modified zirconia support, while double-stranded DNA is only weakly bound if at all. Protein separation on this packing can be performed by applying both high-performance liquid chromatography and batch procedures. The results show that polyphosphate-modified zirconia is a useful affinity packing for immobilization and purification of biomacromolecules.

Alkaline Phosphatase↗

Functional morphology of the nictitating membrane in the domestic cat.

Morphological differences between the corneal and palpebral surfaces of the nictitating membrane of the domestic cat were examined using histology, histochemistry and the scanning electron microscope. Both surfaces are covered by one or two layers of epithelial cells. The epithelium contains numerous goblet cells, particularly on the palpebral side. These cells revealed binding sites for six lectins as well as positive PAS reactivity, and alcianophilia at both pH 2.5 and pH 3.5. Numerous lymph follicles located on the corneal side make the epithelium look like lymphoepithelial tissue. Accumulations of lymphatic tissue may also be found on the palpebral side. Scanning electron micrographs showed microvilli on the epithelial surfaces. The function of the cat nictitating membrane is discussed on the basis of our findings and those of other authors. Movements of the nictitating membrane alternate between active and passive phases of gliding. The membrane as a whole effectively protects the nasal portion of the bulb from dust, dehydration and pathogens.

Animals↗

[Cockayne-Touraine epidermolysis bullosa dystrophica. A case report].

We report about a new-born child with a nearly generalized bullous epidermolysis. The diagnosis Epidermolysis bullosa dystrophica (Cockayne-Touraine) was determined by repeated investigations with electron microscopy. Differnetialdiagnosis and therapeutic possibilities are discussed.

Diagnosis, Differential↗

[Our approach to the care of chronic instability of the knee joint].

Chronic instability of the knee joint is a serious problem for the affected patient and the attending physician. Diagnosis must reveal which structures of the soft knee are insufficient. We use as a basis in particular a detailed clinical examination which frequently must be made under short-term general anaesthesia. As to auxiliary examination methods, we recommend X-rays in forced positions, possibly arthroscopy. Defects of the cruciate ligaments can be evaluated well also by means of computed tomography. Operation should be indicated carefully. We consider the extent of the patient's complaints, the ability of dynamic compensation of the instability, the presence of exudates, haematomas, signs of arthritis, locomotor restrictions and, last not least, also the assumed ability of the patient to cooperate in rehabilitation. In surgical treatment of instabilities it is necessary to respect carefully biomechanical principles of the function of the knee joint. In prostheses of the cruciate ligaments we prefer direct reconstruction with an autologous graft to extraarticular operations. It seems that in older patients also reconstruction with synthetic ligaments will be feasible.

Adult↗

[Concepts in the treatment of injuries of the thoracic and lumbar spine].

The thoracolumbar connection represents a particular problem in view of the extent and stability of spine damage. A retrospective examination after conservative treatment of unstable injuries has shown unfavourable results. The authors therefore established a new therapeutic concept for this injury. Instable injuries should be surgically treated as early as possible, those with neurological defect are subject for emergency operation. A surgical approach (posterior transpedicular) is described. The urgent operation on the injured persons with medullar lesions enable an early rehabilitation and prevents further complications.

Fractures, Bone↗

Early complications in patients with multiple injuries and polytraumatism with special regard to traumatic fat embolism.

In the introductory part contemporary data concerning fat embolism occurrence and mortality, as taken from the world literature, are evaluated. Thus, the author opens the whole complicated problem of post-mortem examination findings with a different extent of fat embolization (most often in the lungs, rarely in organs belonging to the area supplied by the systemic blood circulation) on the one hand and the fat embolism clinical syndrome on the other hand. The clinical syndrome is a rare phenomenon in comparison with the relatively frequent morphological abduction findings of a more serious character (of the 2nd and higher degree). The evaluation of fat embolism as the main cause of death cannot be based only on the morphological findings, ascertained at the post-mortem examination in the organs of patients who died of injury consequences. At the same time, however, the question is open of evaluating the fat embolism syndrome as the contrary of the fulminant form of fat embolism to the classical fat embolism syndrome as it manifests itself in practice after the free interval. The author sees the mentioned contrary in the fact that the diagnosis of the fulminant fat embolism syndrome resulting in death within a few hours is mainly based on the microscopical findings of fat embolism in the capillaries of the organs whereas that of the classical fat embolism syndrome is possible not only clinically but can be confirmed also macroscopically and microscopically, morphologically and histologically in the cases of death of such injured patients. The morphological confirmation of the classical fat embolism syndrome after an accidental death within some weeks after the injury and after the clinical course of the classical syndrome has, however, time limits as far as the macroscopical findings but especially the microscopical evidence of fat embolism are concerned. In this part of the study many statements of the author are based on the occurrence of 208 patients with fat embolism in the continuously observed clinical material of all the hospitalized injured persons (16,706) at the Research Institute of Traumatology between 1963-1983. In consideration of the accumulated admission of severely injured patients from traffic accidents especially, the total mortality is 6.55% (6.25% of men; 7.18% of women). Fat embolism as the main cause of death makes up 10.15% (8.25% of men; 13.61% of women) of total mortality. The occurrence of the fat embolism syndrome is, however, much lower: 1.25% (1.16% of men; 1.43% of women). The fat embolism syndrome mortality is high: 53.73% (44.70% of men; 68.42% of women).

Embolism, Fat↗