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Biomedical subjects

M Klinger

Publications and source records attributed to M Klinger.

At least 19 recordsLinked to original sources
PubMed1997

[Microcirculation of the nasal mucosa during use of balloon tamponade].

BACKGROUND: Nasal packings are commonly accepted in the treatment of severe epistaxis. Cuffed catheters are known to cause damage to the nasal mucosa most likely by interfering with tissue perfusion. In this study the effect of different pressure levels on local perfusion of septal mucosa is investigated. METHOD: In 15 healthy subjects the blood flow in septal mucosa was measured by laser doppler flowmetry by positioning a cuffed epistaxis catheter into the nasal cavity with a laser probe attached to it. Increasing pressure was administered by injecting saline solution while continuously recording intraluminal pressure, perfusion, and filling volume. The local pressure affecting the septal mucosa at the moment of stalling perfusion was determined by subtracting the extranasal cuff pressure from the current intranasal cuff pressure at same inflation volumes. RESULTS: Microcirculation of the septal mucosa stopped when the local pressure exceeded a value of Pmean = 42 mmHg. Individual variations (n = 15) were small (s = 9 mmHg). The intraluminal cuff pressure was measured to be about ten times higher due to the retraction force of the cuff. Spontaneous oscillations of the blood flow were reduced with increasing pressure to the blood vessels. Filling volumes up to 3.2 ml were sufficient to stop perfusion. CONCLUSIONS: Cuffed nasal packings stop the blood flow in nasal mucosa even at low local pressures. Depending on the material characteristics of different cuffs the pressure to dilate the cuff may, however, be several times higher than the actual local pressure. This effect may cause problems in the proper use of cuffed catheters. Laser doppler flowmetry proved to be helpful in determining reproducible perfusion values.

Adolescent↗
PubMed1997

Different erythrocyte and platelet surface electric charge in various types of glomerulonephritis.

BACKGROUND: Some preliminary observations suggest that predisposition to a particular type of glomerulonephritis (GN) may be connected with the genetically determined charge of the glomerular capillary wall. A correlation between erythrocyte surface and the glomerular capillary wall charges has also been observed. The purpose of this study was to verify and extend previous investigations. Therefore we measured erythrocyte and platelet surface charge from patients with idiopathic membranous and mesangial GN as well as idiopathic membranoproliferative GN and lupus nephritis. METHODS: The erythrocyte and platelet surface charge was determined by the binding of the cationic dye, alcian blue (AB). A fresh alcoholic AB solution was made for each experiment, which were run in batches of four, each including cells from a healthy person and from patients each with a different type of GN. RESULTS: In patients with idiopathic membranous and membranoproliferative GN, a significant decrease in the erythrocyte and platelet charges was observed irrespective of their clinical state (remission or nephrotic syndrome). Erythrocyte charge was decreased despite the normal amount of membranous sialic acid. In contrast, patients with idiopathic mesangial GN, in complete or partial remission, exhibited normal erythrocyte and platelet surface charges. Exclusively in this type of GN, the appearance of nephrotic proteinuria was associated with a slight decrease, the erythrocyte charge, which was not statistically significant (P > 0.1). A reduction in the negative erythrocyte charge in lupus nephritis was less in magnitude than in idiopathic membranous or membranoproliferative GN, and occurred independently of the level of daily proteinuria, whereas the platelet charge was normal. CONCLUSION: The decrease of the erythrocyte and platelet charge in idiopathic membranous and mebranoproliferative GN seems to be a pre-morbid feature.

Adolescent↗
PubMed1997

[Prolonged use of the femoral catheter as a temporary access for hemodialysis].

Cannulation of the femoral vein is the safest method of acute vascular access. It is recommended the removal of the femoral catheter after 72 h. The trial was undertaken, if it is possible a safe prolonged use of the femoral cannulation. The observations were performed in 70 patients (31 F, 39 M, age 3-70 years) with acute and chronic renal failure (RF). The femoral catheter was left in place for the period from 7 to 104 days, mean 21 days. None complications occurred in the group of 16 patients in whose the cannula was left up to 14 days. Bt duration of the cannulation above 15 days (54 patients) exist site infections appeared in 10 patients, catheter thrombosis in 12 patients and fiber in 6 patients (all with the catheter in place above 21 days). Noteworthly chronic RF patients were dialysed mostly on the ambulatory basis. Femoral catheter can be left safely in place for 14 days.

Adolescent↗
PubMed1996

Vigilin contains a functional nuclear localisation sequence and is present in both the cytoplasm and the nucleus.

Vigilin is a member of the KH protein family and contains 14 tandemly arranged potential RNA-binding domains. Between KH domains 2 and 3 we have identified a nuclear localization sequence by cloning this sequence into the NH2-terminal region of phage T7 RNA polymerase as a reporter protein and by showing its transfer into the nucleus. Furthermore we provide experimental evidence that Vigilin is present both in the nucleus and in the cytoplasm in similar concentrations. These observations support the notion that Vigilin may shuttle between nucleus and cytoplasm presumably in contact with RNA molecules.

Amino Acid Sequence↗
PubMed1996

[Ultrasound diagnosis of orbital floor fractures: an alternative to computerized tomography?].

BACKGROUND: Plain radiography of the paranasal sinuses (Water's view) may fail to demonstrate typical signs of orbital floor fractures. To resolve questionable cases, computed tomography (CT) is performed. B-mode ultra-sonography (US) is investigated concerning its reliability and as a possible alternative to CT. The replacement of standard radiological techniques in primary evaluation will be discussed. METHODS: A skull was used to assess the visualization of the bony floor in the ultrasound-technique. Fifteen patients with suspected fractures of the orbital floor were investigated with plain radiographs, ultrasound of both orbits in closed-eyelid technique, and CT scans. The findings were compared. RESULTS: Thirteen patients were found to have apparent fractures in CT scans. These fractures were also diagnosed on ultrasound. In three patients, ultrasonographic localization was imprecise. These fractures were located behind the lower orbital rim or far posteriorly. Plain radiographs showed positive fracture signs only in five patients. Localization was not possible. The application of the ultrasound probe was well tolerated. CONCLUSIONS: B-mode ultrasonography is a valuable and inexpensive technique to visualize orbital floor fractures. It should be employed in primary evaluation patients with suspected isolated orbital floor fractures prior to taking plain radiographs of the paranasal sinuses. Computed tomography should be used in suspected complex fractures and questionable orbital fractures.

Adult↗
PubMed1996

Patch-clamp study on T-lymphocyte potassium conductance in patients with chronic renal failure.

Using the patch-clamp technique, we studied the differences in whole-cell potassium conductance (g(K)+) in T lymphocytes (TL) from three groups of patients suffering from renal failure: not dialyzed patients, dialyzed patients, and dialyzed patients treated with human recombinant erythropoietin (rHuEPO). The differences in g(K+) values in the group of not dialyzed patients in comparison with controls was not significant (p > 0.05). In the group of dialyzed patients, after roughly 6 years of the hemodialysis therapy, the g(K+) value was significantly higher than in controls. In dialyzed patients treated with rHuEPO, g(K+) value was significantly lower in comparison with control. Moreover, in dialyzed patients treated with rHuEPO, the time duration of dialysis therapy did not significantly affect the TL whole-cell conductance. We conclude that the g(K+) is changed in TL in renal failure patients and that the time duration of hemodialysis therapy as well as the use of rHuEPO affect the g(K+) value. Possible mechanisms underlying the observed changes in g(K+) values, as well as medical implications of obtained results are discussed.

Anemia↗
PubMed1996

[Ultrasound imaging of nasal bone fractures with a 20-MHz ultrasound scanner].

High frequency B-scan ultrasonography is a proven method for the assessment of skin tumors and evaluation of the thickness of skin and cartilage layers. Only limited studies have used sonography to examine bony structures. Our goal was to evaluate the importance of ultrasonography in the diagnosis of nasal fractures. Patients with clinical and/or radiological evidence for such fractures were also examined with 20 MHz B-scan ultrasonography. Results of sonography demonstrated a significant correlation with the nasal fractures present, indicating that additional radiographic examinations are unnecessary in certain cases.

Adult↗
PubMed1996

[Antiphospholipid antibody syndrome in systemic lupus erythematosus].

Various hemostatic abnormalities that can be met in the course of apparently unrelated diseases are caused by antiphospholipid antibodies (APA). Nearly on half of the population with antibodies detectable in serum suffer from systemic lupus erythematosus (SLE) or the disease will be diagnosed in the future. The supposition considering that APA do not bind phospholipids directly becomes popular recently. They bind serum beta 2-Glycoprotein. The APA-beta 2 GIP complexes speed up prothrombin activation and make beta 2 GIP less available for serum C- and S-protein transformation. APA are a heterogenous population of antibodies. Postinfectious APA differ from those found in autoimmune diseases. Thrombotic events caused by APA are treated according to general principles. Steroid therapy is essential in treatment programme of SLE with APA. In severe cases it is supplemented by intravenous cyclophosphamide. Plasmapheresis and intravenous immunoglobulins are of limited usefulness. In severe resistant thrombocytopenia one can try to introduce Danazol carefully.

Antibodies, Antiphospholipid↗
PubMed1995

Detection of the chemokine RANTES in cytokine-stimulated human dermal fibroblasts.

A novel family of structurally and functionally related polypeptides has recently been detected that are now referred to as chemokines. Within this family, a peptide with the acronym RANTES was shown to be chemotactic for memory T cells, monocytes, and eosinophilic and basophilic granulocytes, thus suggesting it plays an important role in chronic inflammatory and allergic diseases. Murine monoclonal antibodies as well as cDNA probes specific for human RANTES were raised and extensively characterized. With these antibodies, stimulated human dermal fibroblasts were shown to express intracellular RANTES peptide by immunocytochemistry. Furthermore, similar kinetics could be demonstrated in fibroblasts for both RANTES mRNA expression and secretion of RANTES peptide using Northern blot hybridization and sandwich-enzyme-linked immunosorbent assay, respectively. RANTES expression was induced upon stimulation with tumor necrosis factor-alpha as well as with interleukin-1 alpha and -beta in a concentration- and time-dependent manner. These results reinforce the role of both resident and circulating cells in the production and release of RANTES and their participation in inflammatory processes.

Antibodies, Monoclonal↗
PubMed1995

[Kikuchi lymphadenitis. A contribution to the differential diagnosis of cervical lymph node swelling of unknown origin].

According to its morphological appearance, Kikuchi's disease is also called "histiocytic necrotizing lymphadenitis". This disorder was first described in Japan in 1972 as a benign lymphadenopathy of the neck. In Germany only a few cases have been reported by pathologists, whereas most clinicians are unaware of the existence of this rare disease, which can easily be mistaken for malignant lymphoma. In 1993 three cases of Kikuchi's lymphadenitis were treated at the ENT Department of the University of Lübeck. Patients' ages ranged from 15 to 30 years old. Except for cervical adenopathy, findings in blood tests, viral serology and radiological imaging were unremarkable. While fine needle aspirations were suspicious for malignant lymphoma, a final diagnosis of self-limiting "Kikuchi's lymphadenitis" was established histologically from excised lymph nodes. In our opinion early extirpation of lymph nodes and consultation of a pathologist are necessary to make a correct diagnosis without delay. Thus, in patients with Kikuchi's lymphadenitis unnecessary staging procedures and treatment can be avoided.

Adolescent↗
PubMed1995

[Lupus pregnancy, its effect on the course of lupus nephritis and the evaluation of fetal loss frequency].

The subject of analysis were data concerning the 101 pregnancies in 43 patients with systemic lupus erythematodes observed in years 1965-1990. The evaluation proved that pregnancy does not deteriorate the course of lupus nephritis that is in the remission before the conception. In lupus patients the risk of fetal loss and stillbirth is high, especially in the presence of anticardiolipin antibodies. The course of active lupus occurring during pregnancy is frequently severe and its effect on the pregnancy is very harmful.

Antibodies, Anticardiolipin↗
PubMed1995

[Outline of immune deficiency pathogenesis in patients with chronic renal failure].

Up to day the pathogenesis of immune deficiency in chronic renal failure have not been clearly elucidated. There is no agreement where is situated the primary disturbance that makes that category of patients more susceptible to infections and neoplasms. The views presented in this paper seem to shift the balance toward multifactor theory. Possible influence of many biochemical abnormalities and effect of renal replacement therapies on main elements of immune system are discussed.

Cell Membrane↗
PubMed1994

Post-embedding immunocytochemistry for adhesive proteins and clathrin in LR White- and LR Gold-embedded human platelets.

Two hydrophilic acrylic resins, LR White and LR Gold, were tested for their suitability for post-embedding immunocytochemistry on human platelets. Both resins gave satisfying results with regard to ultrastructural preservation and retention of antigenicity for von Willebrand factor, fibrinogen, fibronectin and clathrin. Embedding in LR White and polymerization at 50 degrees C without accelerator proved to be the best method because it provided clear negative membrane contrast, good immunocytochemical localization of antigens and the entire procedure required a comparatively short time. Label for von Willebrand factor was found in typically eccentric location in alpha-granules, but also in the form of small caps directly outside the granule membranes, beneath the outer plasma membrane and in the cytoplasm. With the exception of the eccentric location within granules, labelling for fibrinogen and fibronectin revealed very similar results. Label for clathrin appeared in the form of small gold clusters attached to alpha-granules, in the cytoplasm and beneath membranes of the open canalicular system. Together with the appearance of coated vesicles attached to granules and to the membranes of the open canalicular system in araldite-embedded material, these results further strengthen the concept that adhesive proteins are taken up from the plasma and stored in granules. Moreover, the persistence of the clathrin coat on vesicles attached to storage granules may also indicate that receptors for adhesive proteins are recycled.

Acrylic Resins↗