Biomedical subjects

O Sevin

Publications and source records attributed to O Sevin.

4 recordsLinked to original sources

PubMed2001

Hemostatic changes in patients receiving hydroxyethyl starch: the influence of ABO blood group.

Hydroxyethyl starches (HES) interfere with coagulation because of their molecular structure and the amount infused during surgery. Coagulation defects include platelet dysfunction and a decrease of the VIII/von Willebrand factor complex (VIII/vWF). We examined the effects of 6% HES 200/0.6 on hemostasis by using an in vitro platelet function analyzer, the usual coagulation tests, the VIII/vWF complex assessment, and TEG analysis in patients undergoing abdominal surgery. The influence of the blood group was investigated. HES infusion induced primary hemostasis alterations, assessed by a prolonged platelet function analyzer closure time in the presence of epinephrine and adenosine diphosphate, which was not correlated with the platelet count. The decrease in VIII/vWF complex was proportional to the volume of infused HES (20 and 30 mL/kg) and was more pronounced in patients of the O blood group. The preoperative hypercoagulability status assessed by TEG analysis was reversed 24 h after HES infusion. In conclusion, 6% HES 200/0.6 induced immediate hemostasis alterations. Patients of the O blood group were likely to develop a von Willebrand-like syndrome after HES infusion. We conclude that intraoperative use of 6% HES 200/0.6 should be restricted in patients of the O blood group undergoing surgical procedures with high risk for bleeding.

ABO Blood-Group System↗

PubMed2000

Potentiation of vitamin K antagonists by high-dose intravenous methylprednisolone.

BACKGROUND: Oral anticoagulants and pulse high-dose intravenous methylprednisolone are often administered concomitantly, but no data on potential interactions are available. OBJECTIVE: To assess possible potentiation of oral anticoagulation by high-dose intravenous methylprednisolone. DESIGN: Prospective cohort study. SETTING: University hospital in Paris, France. PATIENTS: 10 consecutive patients concomitantly receiving methylprednisolone and oral anticoagulants (fluindione and acenocoumarol) and 5 consecutive controls receiving methylprednisolone alone. MEASUREMENTS: Serial determinations of the international normalized ratio (INR) and clotting factors during administration of pulse methylprednisolone. The total plasma fluindione concentration was determined in 3 patients. RESULTS: The mean INR was 2.75 (range, 2.02 to 3.81) at baseline and increased to 8.04 (range, 5.32 to 20.0) after methylprednisolone administration. Plasma fluindione concentrations and the INR increased after methylprednisolone administration. Methylprednisolone alone did not increase prothrombin time. CONCLUSIONS: The action of oral anticoagulants is potentiated by intravenous high-dose methylprednisolone. The INR should be monitored daily during concomitant administration of these medications.

Acenocoumarol↗

PubMed1998

Quantification of apoptosis by the Abbott CD4000 hematology analyzer.

We propose a simple and fast method of detecting apoptosis using an automated hematology analyzer. Detection is based on cellular optical light scatter properties and demonstration of the membrane fragility which characterizes cells undergoing the process of apoptosis. As part of it's routine leucocyte differential analysis, the Abbott Cell-Dyn 4000 collects multi-angle cellular light scatter data. In addition red fluorescence (FL3) emitted by cells following propidium iodide labeling is collected. This provides quantitation of both the erythroblast count and a leukocyte viability index (WVF). Fresh or cryopreserved peripheral blood cells from 17 B-chronic lymphocytic leukemia (B-CLL) patients were incubated in presence of theophylline, fludarabine or in medium alone. After 36-hrs of culture the percentage of apoptotic cells of the sample was determined from the parameters of the CD 4000 described above and thereafter this was compared with reference methods for estimation of apoptosis. The reference methods used were in situ detection of cell death on slides (TUNEL test) and also flow cytometry (Annexin V). Results showed an excellent correlation between the 3 techniques. This rapid, easy and reliable method of quantifying apoptosis may be very useful means of routinely predicting the response to chemotherapy.

Apoptosis↗

PubMed1992

[Java's large population: two centuries of explanations].

"Explanation of demographic imbalance between Java and the socalled 'Outer-Islands' has been numerous for almost two centuries. Authors generally considered that the great density of population was a direct consequence of the high fertility of Javanese soils. Some of them, however, connected it with an early economical 'take-off'. But none of these analyses can explain why marginally suitable regions from an agricultural point of view were overcrowded especially when their economical development was low. We propose another explanation scheme on an historical basis." (SUMMARY IN ENG)

Asia↗