By MARY C. MoRGAN AND JEAN J. SZAFIP A QUANTITATIVE method for the separation of morphologically intact ftinctional platelets from whole blood is not available at the present time. Methods have been described which use differential centrifugation or sedimentation, with and without washing procedures. The prolonged manipulations required with these procedures to insure total recovery leads to pl...

The discovery of citrate anticoagulant in the 1920s and the development of plastic packs for blood collection in the 1960s laid the groundwork for platelet transfusion therapy on a scale not previously possible. A major limitation, however, was the finding that platelet concentrates prepared from blood anticoagulated with citrate were unsuitable for transfusion because of platelet clumping. We ...

Thirty-seven patients with idiopathic thrombocytopenic purpura (ITP) were treated with a standard Helicobacter pylori eradication regimen irrespective of H. pylori infection. Our results indicate that platelet recovery results from the disappearance of H. pylori itself, and is mediated, in part, through suppression of anti-platelet autoantibody production.

With data on 91 alloimmunized thrombocytopenic patients and 389 donor-recipient pairs matched or selectively mismatched for HLA antigens, it was observed that ABO incompatibility significantly reduced the effectiveness of platelet transfusions. The mean 24-hr recovery of platelets from histocompatible donors and from donors selectively mismatched for cross-reactive HLA antigens was decreased by...

The linear return of platelet malondialdhyde (MDA) production after aspirin ingestion as described by Stuart et al.4 has been widely accepted as a nonisotopic method for the determination of platelet survival. However. using assays for platelet prostaglandin production and cyclooxygenase activity. a number of authors2’ ’1 have now reported a 24 to 48-hr delay in recovery after aspirin. This del...

AIMS Thromboxane A2 (TXA2) induces platelet adhesion through thromboxane prostanoid (TP) receptor. Platelets contain many pro-angiogenic factors and are recruited to the site of vascular injury. However, the cellular and molecular mechanisms of platelet-dependent angiogenesis, especially the involvement of TP signalling, have not been fully elucidated. The present study hypothesized that TP-dep...

Erythropoietin (EPO) has been shown to enhance angiogenesis, but its precise mechanisms of enhancement during ischemia are not fully elucidated. We examined the effect of EPO on blood flow recovery from acute hind-limb ischemia induced by ligation of the femoral artery in male C57Bl/6 mice. The density of microvessels with platelet adhesion in ischemic tissues was assessed by intravital microsc...

Placebo-controlled clinical trials of recombinant human interleukin-11 (rhIL-11, also known as oprelvekin [Neumega]) in patients with nonmyeloid malignancies have demonstrated significant efficacy in preventing postchemotherapy platelet nadirs of < or = 20,000/microL, and reducing the need for platelet transfusions while continuing chemotherapy without dose reductions. The likelihood of requiri...

Because most cases of secondary dengue virus infection are associated with an increased level of platelet-associated IgG, a high dose of intravenous immunoglobulin (IVIG) may have an effect on the development of severe thrombocytopenia in this disease. A randomized, controlled study was conducted with two treatment groups consisting of a treatment (IVIG) group (n = 15) and a non-treatment (non-...

We have studied 16 normal subjects and 27 patients with stable, untreated thrombocytopenia secondary to bone marrow failure and platelet counts ranging from 12,000 to 70,000/microL. Autologous platelets were labeled with 51Cr for measurement of mean platelet life span in the normal subjects and in 20 patients. Labeled donor cells were used in the remaining subjects. Platelet survival, as determ...