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Using a grouping method we studied the disease homogeneity within a group of 109 patients with systemic lupus erythematosus. The mean observation period was 6 years and 8 months. By using a cluster analysis, the total group of patients could be subdivided into two subgroups which differed clearly in their symptomatology. One subgroup (n = 42) showed higher incidence of elevated serum creatinine values, proteinuria, oral ulceration and severe anaemia. All 13 deaths occurred in this group. The second group (n = 67) was characterized by a more benign course of disease, a notably decreased incidence of renal involvement, and the Raynaud's Phenomenon was comparatively frequent.

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Using a grouping method the disease homogeneity within a group of 59 patients with systemic lupus erythematosus was studied. The mean observation period was 8 years and 10 months. By using a cluster analysis, the total group of patients could be divided into two subgroups which differed clearly in their symptomatology. One subgroup showed a higher incidence of hypertension, severe anaemia, oral ulceration, elevated serum creatinine values, and proteinuria. All 8 deaths occurred in this group. The second group was characterized by a more benign course of disease, a notably decreased incidence of symptoms characteristic for the first subgroup, and no deaths.

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Burkitt tumors are malignant lymphoblastic lymphomas occurring predominantly in Africa in children and young adults and involving in many cases the intestinal tract; these tumors occur rather seldom outside Africa. A case report is given of a white 21 old female suffering from this disease; that first manifestation was an isolated ulcerating tumor of the rectum without involvement of other organs of lymph nodes. Diagnosis was confirmed by rectum biopsy. X-ray therapy, cytostatic therapy and amputation of the rectum did not prevent a fast progression of the disease and final death, which is the usual course of the disease when it occurs outside Africa.

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In 10 patients (age: 31--72 years) oxygen supply of skeletal muscle was measured by pO2-multiwire technique. All patients suffered from chronic renal failure of differing etiologies and from chronic renal anemia. In muscle tissue 1,128 different O2-tensions were registered and the results were expressed as pO2-histograms. Seven of these pO2-histograms show a normal distribution, three are shifted to the left to lower O2-tensions. Therefore the microcirculation in the skeletal muscle of patients with chronic reduced O2-carrying capacity is largely undisturbed. The microcirculation is able to increase with exercise as shown by a shift to the right in the PO2-histogram. The use of the pO2-multiwire electrode is largely devoid of risk to the patient. Important pathological features may be demonstrated.

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Renal failure in patients with acute or chronic hepatic insufficiency may be caused by prerenal factors (diuretics, hemorrhage), acute renal failure (shock, toxic tubular necrosis) or concurrent primary renal disease. Prerenal (functional terminal or circulatory) insufficiency to the kidneys seems to occur spontaneously; it is characterized by progressive reduction of glomerular filtration rate and renal plasma flow due to vasoconstriction and increase of intrarenal arterial resistance; the pathogenetic mechanisms of these changes are unknown. Reduction of effective plasma volume is especially important. Attempts at pharmacologically influencing renal blood flow have failed up to now. Increase of plasma volume and furosemide medication are therapeutic procedures worthwhile trying. Hemodialysis is indicated only, if restitution of liver function can be expected.

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The hypothalamic-hypophyseal-Leydig cell axis was investigated in 17 male patients following renal transplantation. Plasma levels of testosterone, luteinizing hormone (LH) and follicle stimulating hormone (FSH) were determined by radioimmunoassay under basal conditions and after stimulation with chorionic gonadotrophin (HCG) and hypothalamic releasing hormone (LH/FSH-RH) respectively. The investigations were carried out one to five years after renal transplantation. It was demonstrated, that primary dysfunction of Leydig cells may occur after renal transplantation. In some cases however normal Leydig cell function with adequate testosterone secretion may return. It remains uncertain, whether the Leydig cell dysfunction is a result of preexisting toxic uremic damage or whether it is due to immunosuppressive therapy with prednisone and azathioprine.

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