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Biomedical subjects

R Kretschmer

Publications and source records attributed to R Kretschmer.

At least 19 recordsLinked to original sources
PubMed1992

[Interposition connectors with heparin coating for vascular anastomosis of microsurgical tissue flaps].

The intraluminal surface of interposition connectos which are introduced for the quick vascular connection of microsurgical free flaps was coated by heparin. This heparin coating proved to be stable at the polyurethane wall until the intraluminal surface of the interposition connectors with a length of 15 mm was coated by a layer of endothelial cells. 90% of the experimental venous connections didn't show a thrombus formation and were open for the blood flow 10 days postoperatively. The experimental free flaps which were connected by this way had survived 21 days postoperatively and showed a regular healing.

Anastomosis, Surgical↗
PubMed1991

Disseminated cytomegalovirus infection of the female genital tract.

A woman with severe immunosuppression provoked by the acquired immunodeficiency syndrome developed a disseminated cytomegalovirus infection of the genital tract. Using in situ hybridization and the APAAP technique, cytomegalovirus was detected in epithelial and endothelial cells as well as in macrophages in the vulva, the vagina and the cervix uteri.

Acquired Immunodeficiency Syndrome↗
PubMed1991

[Non-tropical sprue and chronic inflammatory rectal stenosis in a patient with abuse of ergotamine-containing suppositories].

A 51 year old Yugoslavian patient was admitted to our hospital in reduced general condition with distinct hypocalcemia, osteomalacia, and with rectum stenosis. Our investigations led to the diagnosis of a malabsorption syndrome due to non-tropical sprue. The most likely cause of the rectum stenosis is an abuse of ergotamine-containing suppositories for several years. A gluten-free diet and the interruption of the use of the suppositories improved her general condition remarkably.

Bone Density↗
PubMed1990

[CMV virus infection of the vulva and vagina].

Clinical and histopathological findings of a woman with AIDS and an ulcerated vulvovaginitis are presented. The preliminary diagnosis of a herpes vulvitis was corrected after in-situ-hybridisation of the formalin-fixed and paraffin-embedded tissue. CMV was found in macrophages and endothelial cells in the vulva and vagina. In view of the increase in the number of immuno-suppressed patients these findings should direct clinical attention to this so far unusual manifestation of a CMV-infection.

Adult↗
PubMed1990

[The eosinophil and Entamoeba histolytica. II. Testicular amebic lesions produced in eosinophilic rats].

Even though eosinophiles are not characteristic of amebiasis, polymorphonuclear eosinophilic cells are regularly found in the inflammatory lesion which occurs in the early phases of amebic invasion. To acquire better knowledge of the intervention of these cells when confronted with E. histolytica, testicular lesions were produced by means of direct injection of amebas in rats with eosinophilia. Eosinophilia (greater than or equal to 4%) was induced in male Sprague Dawley rats by an intravenous injection of Sephadex G200 suspension. Later, both the eosinophilic and normal (control) rats were challenged with an intratesticular injection (on the left side) of 2 x 10(6) amebas of the virulent strain HM1-IMSS. The other testicle was injected with BFS-A to serve as control. The testicles were removed 5 hours later and evaluated histologically. The size and celullarity of the testicular lesions produced by the ameba on both eosinophilic and controls were similar, whereas lesions were not found in testicles injected with BSF-A. Within the limits of our experimental model, the results suggest that eosinophils do not contribute substantially to the genesis of tissue lesions produced by E. histolytica.

Animals↗
PubMed1990

[Histocompatibility antigens and acute vascular purpura].

INTRODUCTION: Some kidney diseases are associated to HLA antigens. Nyulassy found an increase in HLA-B35 in patients with Henoch-Schönlein's purpura suffering nephritis (HSP-N). Our study searched for associations of HLA antigens and anaphylactoid purpura nephritis in Mexican mestizo patients. MATERIAL AND METHODS: HLA-A,B, and C antigens were detected by two-step microcytotoxicity in 22 patients with HSP-N and compared to those of 665 healthy subjects of the same ethnic background. RESULTS: A significant association was found between HSP-N and HLA-Aw19 single (pc less than 0.05) or in haplotype form (Aw19-B35) (pc less than 0.005). HLA B35 alone was associated to HSP-N but only at non corrected level (pc less than 0.05). DISCUSSION: The significant association between HLA-Aw19 and Aw19-B35 and HSP-N may indicate a risk factor in Mexican mestizo patients to develop this case.

Adolescent↗
PubMed1989

In vivo 31P NMR spectroscopy of energy rich phosphates in the brain of the hyperammonemic rat.

Hyperammonemia is a major contributing factor to the neurological abnormalities observed in hepatic encephalopathy and in congenital defects of ammonia detoxication. In rats variable changes in labile energy rich phosphates in the brain have been observed in hyperammonemia using biochemical methods. Using 31P-NMR spectroscopy however no significant changes of the relative concentrations of the energy rich phosphates alpha, beta and gamma-ATP, phosphocreatine, inorganic phosphate and the pH were found in the fronto parietal cortex of the urease treated hyperammonemic rat. Alterations in the metabolites of these compounds do not appear to be a major pathomechanism of ammonia toxicity in this brain area.

Ammonia↗
PubMed1985

Inhibition of human monocyte locomotion by products of axenically grown E. histolytica.

The supernatant fluid of axenically grown E. histolytica inhibits chemotaxis, chemokinesis and random mobility of human mononuclear phagocytes (MP) as measured in Boyden chambers. Human polymorphonuclear phagocytes (PMN) locomotion is apparently unaffected. The factor was found in comparable amounts in the supernatant fluid of axenic cultures of four E. histolytica strains that differed in their human pathogenicity and virulence, as well as in two entamoebas non-pathogenic for man. This dialysable and thermolabile MP-locomotion inhibiting entamoeba product (EP) can be absorbed out by incubation with MP, but not with lymphocytes, while partial absorption was observed using PMN. The MP-locomotion inhibitory effect of this EP was cancelled by inhibiting protein synthesis in the MP by means of cycloheximide. In vivo, this EP caused a delay in MP migration in Rebuck skin windows. The molecular weight of this EP lies between 478 and 765 by gel-sieve chromatography. Our results suggest a direct effect upon the cytoskeletal and locomotive apparatus of the MP. This MP-locomotion inhibiting EP could contribute to the paucity of the inflammatory reaction observed in the advanced stages of invasive amoebiasis and consequently also to the lack of scar tissue formation upon healing of amoebic lesions.

Adult↗
PubMed1983

Avoidance of perinatal transmission of hepatitis B virus: is passive immunisation always necessary?

Screening of 8918 pregnant women revealed that 107 (1.2%) were HBsAg-positive. 92 of them (50 of German and 42 of predominantly Asian origin) have already delivered and were followed up for 12 months together with their infants. 14 infants of HBeAg-positive (or anti-HBe-negative) carrier mothers received a single dose of hepatitis B immunoglobulin (HBIG) immediately after birth, while 60 infants of anti-HBe-positive mothers were not immunised. 57 of the 60 "unprotected" children remained seronegative for HBsAg and HBeAg. 3 children showed HBs-antigenaemia immediately after birth; 2 of these lost HBsAg and developed anti-HBs after 6 and 9 months. The third lost HBsAg after 4 months without an antibody response developing. This suggests that the HBsAg particle only was transmitted rather than the whole virus. 12 of the 14 infants born to HBeAg-positive, or anti-HBe-negative carrier mothers were protected with one single high dose of HBIG. 2 had HBs-antigenaemia, 1 had HBeAg as well. These data show that in a West European population the risk of perinatally acquired HBV infection in the infants of anti-HBe-positive carrier mothers is small, and that passive immunisation of this group is not necessarily indicated.

Asia↗
PubMed1976

Immunoglobulins and beta-1-C globulin in hydatidiform mole vesicles.

Qualitative and quantitative determinations of immunoglobulins (Ig's) and beta-1-C globulin were carried out in fluid vesicles of hydatidiform moles and carrier mothers. The mean concentration of IgG was 9.9 per cent, IgA had 14.3 per cent, in relation to maternal values. No IgM concentrations were detected in molar fluid. Beta-1-C globulin showed 60.5 per cent concentration in relation to mother's serum. It is suggested that in trophoblast of molar vesicles a selective transudate migration of Ig's by a mechanism of pinocytosis takes place to the vesicular fluid.

Beta-Globulins↗