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Biomedical subjects

O Meyer

Publications and source records attributed to O Meyer.

At least 163 records · Page 9Linked to original sources
PubMed1996

Female premenopausal tophaceous gout induced by long-term diuretic abuse.

We describe 3 cases of tophaceous gout affecting premenopausal women. The only precipitating factor to be found was the chronic and unnecessary overuse of furosemide, apparently resulting from a psychological profile of anorexia nervosa. Our cases emphasize the need for physicians to look for hidden abuse of diuretics in the presence of gouty arthritis in menstruating women, especially if tophi are noted.

Adult↗
PubMed1996

[Systemic scleroderma and sarcoidosis: 3 new cases].

We observed 3 patients with successive scleroderma (SS) and (what is considered to be) sarcoidosis (SA). The diagnosis SS included in the 3 patients: Raynaud's syndrome with pulpal necrosis and capillaritis, sclerodactylia and acro-osteolysis, multiple joint pain and FAN+. Also observed were: esophagus involvement (n = 3), pulmonary artery hypertension (n = 1), telangiectasia (n = 2) and anti-Scl 70 (n = 2). Initially, all patients had restrictive pulmonary disease. SS was diagnosed 5 to 9 years prior to SA in 2 patients. Diagnosis of SA was based on the following arguments: Loëfgren's syndrome with erythema nodosa (n = 1), parotiditis (n = 2), sicca syndrome (n = 2), myalgia (n = 2), joint involvement (n = 2), non-infectious pluropericarditis (n = 2), epitheloid and giant cell granulomas without caseous necrosis (lung = 3, liver = 1, lymph nodes = 1, salivary glands = 1, synovia = 1), negative search for bacilli, elevated conversion enzyme (n = 1) and, in each case, by the lack of any other cause. One patient died from lung cancer and another from respiratory failure. Nome of the patients had primary biliary cirhosis. This rare association between SS and SA demonstrates the confluent limits of certain systemic diseases and raises a difficult problem to differentiate pulmonary involvement in these diseases. The gravity of this localization and the poor sensitivy to corticosteroids.

Adult↗
PubMed1995

Systemic lupus erythematosus with choroidopathy and serous retinal detachment.

Systemic lupus erythematosus associated ocular manifestations usually consist of cotton-wool spots and retinal hemorrhages. The authors report one case of lupus choroidopathy revealed by bilateral serous retinal detachment, occurring 4 months after a systemic flare-up of the disease. An immune complexes-mediated phenomenon is involved in these manifestations, which are usually controlled by systemic corticosteroids and immunosuppressive agents. Plasma exchanges were successfully applied in this case, resulting in a disappearance of the retinal detachment in one month.

Adult↗
PubMed1995

Alkalinization of lidocaine 2% does not influence the quality of epidural anaesthesia for elective caesarean section.

This double-blind randomized study compared the effects of an epidural injection of lidocaine hydrochloride 2% (HCl) (Group 1), alkalinized lidocaine 2% (1 ml NaHCO3 per 10 ml of solution) injected either immediately (Group 2) or one hour after preparation (Group 3) in 45 parturients (n = 15 per group) scheduled for elective Caesarean section. Each patient received 16 ml of one of the three solutions. The mean pH values measured just before administration with a pH-meter PHM 64 Metrohm AG were 6.77 for the HCl lidocaine 2% solution, 7.34 for the freshly alkalinized solution and 7.35 for the solution prepared one hour before injection. The median maximal sensory level (range) observed was T3 (T8-C7), T4 (T5-C8) and T4 (T6-C6), obtained after 19 +/- 6 min, 18 +/- 8 min and 16 +/- 6 min respectively for each group. A motor block of grade 2 or 3 on the Bromage scale was obtained in 11, 10 and 14 patients respectively. No failure was observed although 3, 5, and 2 patients in Groups 1, 2, and 3 respectively required a supplementary bolus 20 min after the initial injection because of inadequate sensory level or pain at the operative site. In conclusion, this study shows that neither fresh alkalinization of 2% lidocaine nor the delay of one hour between preparation and injection of the alkalinized solution influences the onset or quality of epidural anaesthesia for elective Caesarean section.

Adult↗
PubMed1995

Partition coefficient of a surfactant between aggregates and solution: application to the micelle-vesicle transition of egg phosphatidylcholine and octyl beta-D-glucopyranoside.

The mechanism of the solubilization of egg phosphatidylcholine containing 10% (M/M) of egg phosphatidic acid unilamellar vesicles by the nonionic detergent, octyl beta-D-glucopyranoside, has been investigated at both molecular and supramolecular levels by using fluorescence and turbidity measurements. In the lamellar region of the transition, the solubilization process has been shown to be first a function of the initial size before reaching an equilibrium aggregation state at the end of this region (the onset of the micellization process). The analysis during the solubilization process of the evolution of both the fluorescence energy transfer between N-(7-nitro-2,1,3-benzoxadiazol-4-yl)-phosphatidylethanolamine (NBD-PE) and N-(lissamine rhodamine B sulfonyl)-phosphatidylethanolamine (Rho-PE) and the fluorescence of 6-dodecanoyl-2-dimethylaminoaphtalene (Laurdan) has allowed us to determine the evolution of the detergent partitioning between the aqueous and the lipidic phases, i.e., the evolution of the molar fraction of OG in the aggregates (XOG/Lip) with its monomeric detergent concentration in equilibrium ([OG]H2O), throughout the vesicle-to-micelle transition without isolating the aqueous medium from the aggregates. The curve described by XOG/Lip versus [OG]H2O shows that the partition coefficient of OG is changing throughout the solubilization process. From this curve, which tends to a value of 1/(critical micellar concentration), five different domains have been delimited: two in the lamellar part of the transition (for 0 < [OG]H2O < 15.6 mM), one in the micellization part, and finally two in the pure micellar region (for 16.5 < [OG]H2O < 21 mM). The first domain in the lamellar part of the transition is characterized by a continuous variation of the partition coefficient. In the second domain, a linear relation relates XOG/Lip and [OG]H2O, indicating the existence of a biphasic domain for which the detergent presents a constant partition coefficient of 18.2 M-1. From the onset to the end of the solubilization process (domain 3), the evolution of (XOG/Lip) with [OG]H2O can be fitted by a model corresponding to the coexistence of detergent-saturated lamellar phase with lipid-saturated mixed micelles, both in equilibrium with an aqueous phase, i.e., a three-phase domain. The micellar region is characterized first by a small two-phase domain (domain 4) with a constant partition coefficient of 21 M-1, followed by a one-phase mixed-micellar domain for which XOG/Lip no longer linearly depends on [OG]H2O. The results are discussed in terms of a phase diagram.

Animals↗
PubMed1995

Influence of different diets on development of DMH-induced aberrant crypt foci and colon tumor incidence in Wistar rats.

The present study was undertaken to investigate certain dietary factors known to affect the development of colon cancer for their ability to modulate aberrant crypt foci (ACF). Male Wistar rats were initiated with oral doses of dimethylhydrazine dihydrochloride (DMH-2HCl, 20 mg/kg body wt) once a week for 10 or 20 weeks. Throughout the study the animals were fed 1) semisynthetic casein-based control diet, 2) control diet with 20% lard, 3) control diet with 20% lard and 20% dietary fiber, or 4) control diet where most of the carbohydrate pool was substituted with sucrose and dextrin. The composition of the different diets was designed to achieve equivalent intakes of essential nutrients. Animals were killed after 10, 20 and 31 weeks. The study showed a pronounced effect of dietary composition on the development of DMH-induced ACF. The diet high in sucrose and dextrin caused a statistically significant increase (p < or = 0.05) in the total number of ACF and number of small and medium ACF. Adding lard to the standard diet did not cause an increase in ACF, but if the dietary fiber was added to the high-fat diet, a statistically significant reduction (p < or = 0.05) in the total number of ACF and number of small and medium ACF was observed. The values of large and extra-large foci reflected the same effect of diets on ACF. The results indicate that tumors in the group fed the diet high in refined carbohydrates were more prominent and occurred with a higher incidence. However, the difference is based on few tumors and is not statistically significant.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1995

Prognostic factors in rheumatoid arthritis. Comparative study of two subsets of patients according to severity of articular damage.

Clinical and biological profiles at the onset of the disease, obtained retrospectively, and human leucocyte antigen typing were studied in 47 rheumatoid arthritis (RA) patients with severe articular damage (group 1) and in 47 patients with limited radiological abnormalities (group 2). The two groups were matched according to disease duration (mean: 8.1 yr). Systemic manifestations were more frequent in group 1. Erythrocyte sedimentation rate (ESR), platelet counts, C-reactive protein (CRP), rheumatoid factor and IgG titres were higher and haemoglobin level lower in group 1. HLA class II genotyping demonstrated that 95.7% of patients in group 1 were Dw4, Dw14 or DR1 as compared to 55.3% in group 2 and 37.1% in normal controls. Two RA-linked DRB1 genes were detected in 34.1% of patients in group 1, vs 8.5% in group 2 and 7.9% in controls. Multiple logistic regression analysis demonstrated that ESR, CRP and genetic markers were the most relevant independent variables and when combined could indicate the outcome in early RA. These data confirmed that different RA subtypes with different prognoses could be associated with particular clinical, biological and genetic profiles. Moreover, some of these factors could serve as predictive markers for outcome at the onset of RA.

Adult↗
PubMed1995

Molecular characterization of the gene cluster coxMSL encoding the molybdenum-containing carbon monoxide dehydrogenase of Oligotropha carboxidovorans.

The CO dehydrogenase structural genes (cox) and orf4 are clustered in the transcriptional order coxM--> coxS--> coxL--> orf4 on the 128-kb megaplasmid pHCG3 of the carboxidotroph Oligotropha carboxidovorans OM5. Sequence analysis suggested association of molybdopterin cytosine dinucleotide and flavin adenine dinucleotide with CoxL and of the [2Fe-2S] clusters with CoxS.

Aldehyde Oxidoreductases↗
PubMed1995

Familial multiple myeloma. Report of a case in a father and daughter. Review of the literature.

We report a case of familial multiple myeloma in a father and daughter. The same lambda chain was detectable in both patients. Symptom onset occurred three years earlier in the daughter than in the father. We found 52 previously published cases of familial myeloma, of which only 13 occurred in a parent and child. Given the incidence of myeloma in the general population, the occurrence of several cases in the same family is probably not due to chance. The few available data on karyotypes and oncogenes are discordant. The respective role of genetic factors and environmental factors is discussed.

Animals↗
PubMed1995

Ossification of the posterior longitudinal ligament, diffuse, idiopathic skeletal hyperostosis, abnormal retinol and retinol binding protein: a familial observation.

We describe a 52-year-old man who presented with diffuse idiopathic skeletal hyperostosis, ossification of the posterior longitudinal ligament, and abnormal levels of retinol and retinol binding protein (RBP). The molar retinol/retinol binding protein ratio was high, suggesting congenital functional RBP deficiency. His two sons, aged 23 and 27 years, shared the same biological abnormality without clinical symptoms. To our knowledge, this is the first case report of such a familial association.

Humans↗
PubMed1995

[Lymphomas of the ocular adnexa in Gougerot-Sjögren syndrome. Apropos of 4 cases].

The risk of malignant B cell lymphoma is increased in Sjögren's syndrome (SS). Orbital localization seems infrequent. We report 4 cases of malignant lymphoma (ML) occurring in 4 women aged 47 to 77 years, with primary SS in 3 cases, located to the conjunctiva in 2 cases, the lacrymal gland in 1 case and the eyelid in 1 case. The interval between the diagnosis of SS and orbital ML varied from 6 months to 15 years. All 4 lymphomas were of the B cell type, low histopathologic grade, with monoclonal gammopathy in 1 case. Extraocular lymphoma was initially present in 1 case. ML remained localized in 2 cases with a follow-up of 4 and 6 years. Two patients treated by excisional biopsy alone are in complete remission 3 and 6 years later. The 2 other patients treated with orbital radiotherapy and chemotherapy died rapidly (transformation into a high grade malignancy in 1 case). We conclude that clinical, immunopathologic features, as well as prognosis and treatment of ocular adnexa ML in SS are similar to those of primary ML without SS.

Aged↗