Biomedical subjects
Publications and source records attributed to M Bisson.
The authors report an observation on a man 68 years of age suffering from Paget's disease in the pelvi-rachidian region. In four years the lumbar lesions evolved to form an L2-L4 vertebral block. The intensity of the bone radiotransparency of the vertebral block indicated some similarity to the localized forms of osteolysis well known in the skull and the long bones.
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The development of experimental atherosclerosis was studied in subtotally nephrectomized rats which were subjected to preimmunization with horseradish peroxidase and subsequent feeding with atherogenic diet. Both in sham-operated pair-fed control animals and in uremic animals, the atherogenic diet caused hyperlipemia which was more pronounced in uremic than in control animals (control animals: triglycerides 1.11 +/- 0.04 mmol/l; cholesterol 5.82 +/- 0.21 mmol/l; uremia: triglycerides 1.33 +/- 0.06; cholesterol 10.9 +/- 0.31). An increase of cholesterol was seen both in the VLDL and in the LDL fractions. Despite more pronounced hyperlipemia, lipid concentration in the aortic wall was not increased nor were more marked histological abnormalities encountered in the aorta of uremic animals (cholesterol-fed control: cholesterol 95.4 +/- 4.4 micrograms/mg protein; phospholipids 2.42 +/- 0.9 micrograms/ml protein; cholesterol-fed uremia: cholesterol 96.8 +/- 4.9; phospholipids 2.52 +/- 0.8). The results suggest that despite hyperlipemia short-term experimental renal insufficiency does not promote atherogenesis.
Serum samples from 140 controls (C) and from 72 patients suffering from defined rheumatoid polyarthritis (RP) were tested for cryoglobulins (CG). CG were found in 19.7 percent of C and 55 percent of RP : a highly significant difference (p less than or equal to 0.001). In the controls there was no correlation between the CG and age or sex. The RP with cryoglobulins seemed to have more inflammation, but systemic manifestations were not any more frequent than in the cryonegative RP. In the RP a correlation was noted between the presence of CG and the following parameters : increase in the sedimentation rate, rise in serum immunoglobulins, IgA and IgC, presence of antinuclear factors, and drop in the C4 fraction of complement. There was no correlation with the presence of the rheumatoid factor in the serum. In 33 cryoprecipitates in the RP, 7 contained IgG, 1 IgM, 22 IgM-IgG -- of which 11 contained C1q and 16 rheumatoid factor -- and 3 contained IgA-IgM-IgG -- of which 1 contained C1q and 2 rheumatoid factor. Some of the biochemical data support the hypothesis that likens these cryoglobulins to immune complexes.
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The authors report a case of Sjögren's syndrome associated with Raynaud phenomenon and mixed IgM-IgG cryoglobulinaemia. Three years after the onset of this association:--Immunoelectrophoresis of the serum showed a monoclonal IgM (lambda) protein, --the level of the mixed IgM-IgG cryoglobulinaemia had increased from 28 mcg/ml up to 12 mg/ml and its IgM component was monoclonal (lambda) with anti-IgG activity. Search for amyloïdosis and for a malignant lymphoma was negative. Such an association of a benign monoclonal gammopathy, mixed cryoglobulinaemia and Sjögren's Syndrome has only exceptionally been reported in the literature.
The authors report a follow-up study of 24 patients who initially fulfilled ARA criteria for juvenile chronic arthritis (JCA). After an evolution period of 6 to 50 years, diagnosis was revised in three patients: one suffered from mixed connective tissue disease, another from psoriatic arthropathy and the last one from Crohn's disease. Among the 21 remaining JCA patients, 16 had still an inflammatory disease when last examined and 2 of these 16 died from amyloidosis. The articular involvement appears to be similar in systemic and polyarticular disease. The physical disability can be correctly appreciated only after a 10 years evolution period. Six patients were functionally classed in grade 4. Their loss of motility was due to hip or/and knee involvement. Five of them improved after complex orthopaedic surgery and the last could not undergo anaesthesia. Both articular involvement and the fact of the chronicity of illness account for psychological and social inaptitudes. Different therapeutics are appreciated and compared.
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