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Introduction: Splenectomy (SPLN) is associated with elevated risk of venous thromboembolic (VTE) disease. Enoxaparin (ENX) is a low-molecular-weight heparin agent used in VTE chemoprophylaxis. Early aspirin administration ameliorates postSPLN platelet hyperaggregability in male mice.

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100 mg acetylsalicylic acid acutely decreases red cell aggregation in women taking oral contraceptives.

Clin Hemorheol Microcirc

September 2000

Service de Gynécologie Obstétrique, Hôpital Arnaud de Villeneuve, France.

Since oral contraceptives (OC) are known to impair blood fluidity and to increase the risk of venous and arterial thrombosis, while acetylsalicylic acid (ASA) decreases the thrombotic risk and modifies some rheologic parameters, we compared the hemorheologic effects of ASA on blood rheology between women treated by OC and women who never received this medication. 25 women under OC were compared to 25 matched women who had never used OC. Blood viscosity (MT90 viscometer) and RBC aggregation (Myrenne aggregometer and AFFIBIO erythroaggregometer) were measured before and 1 hr after women received per os 100 mg ASA, after an overnight fast.

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We have compared the effects of a broad range of clinically relevant concentrations (0.1 to 10 microM) of the steroidal pure anti-estrogen ICI 182,780 and the non-steroidal partial anti-estrogen tamoxifen (TAM) on cell proliferation and induction of apoptosis in the estrogen receptor (ER)-negative ovarian carcinoma cell line A2780. Cell proliferation was assessed by evaluating the number of viable cells, changes in cell-cycle distribution and cell replication rate; while apoptosis induction was assessed by examining nuclear morphological changes associated with apoptotic death and DNA cleavage into 300 and 50 kbp units (large DNA fragmentation) and into 180 bp units (internucleosomal DNA fragmentation).

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Erythrocyte aggregation is a physiological phenomenon and constitutes one of the most important factors accounting for the non-Newtonian properties of normal human blood. Pathological aspects have also been described and therapy aimed at reducing hyperaggregability has been proposed. The object of this study was to establish normal values of erythrocyte aggregation parameters as measured by laser light backscattering and to study the influence of various physiological factors.

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Oral contraceptive (OC) use is a risk for thrombogenic events. This paper reviews effects of OC on oxidative status, coagulation, and platelet activity. Complicating effects of cardiovascular risk factors such as smoking, diabetes, hyperpidemia, and hypertension, are discussed.

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