Evaluation of the performance of Trima Accel® v5.2 for the collection of concentrated high-dose platelet products and concurrent plasma from high platelet count donors, in Germany.

BACKGROUND AND OBJECTIVES: This study was undertaken to test the ability of Trima Accel® version 5.2 to simultaneously collect concentrated high-dose leukoreduced platelet products and double doses of plasma. MATERIALS AND METHODS: Random volunteers (18-65 years of age) with preprocedure platelet counts above 270 × 10(3) /µl were recruited among the blood center's apheresis donors. All complied with the center's donor selection criteria. RESULTS: One hundred fourteen (114) collections were performed. Depending on which definition of single platelet dose is used (2.0 × 10(11) as prevalent standard in most European countries, and 3.0 × 10(11) as prevalent standard in the United States and Canada) in 107/114 (single dose = 2.0 × 10(11) ) and 39/114 (single dose = 3.0 × 10(11) ) instances, a triple platelet product was obtained. In 87 cases (76%), a double plasmaproduct (>430 ml) was collected, and in seven cases (6%), a single plasma product (>220 ml) was collected. In 20 procedures, only platelets without concurrent plasma were collected (18%). Overall procedure time was 87 ± 13 min and average platelet yield per procedure was 8.5 ± 1.4 × 10(11) (final storage concentration, 1,279 ± 153 × 10(3) /µl). The median residual leukocyte content per transfusion dose was 0.13 × 10(6) (0.02-0.98 × 10(6) ) for a single dose of 2.0 × 10(11) and 0.14 × 10(6) (0.02-0.98 × 10(6) ) for a single dose of 3.0 × 10(11) . CONCLUSIONS: Trima Accel® version 5.2 allows for collection of concentrated high yield platelet products. It offers high productivity and reliably achieves the configured yield targets. Leukoreduction performance complied with both US and EU legal requirements. Collection as hyperconcentrates furthermore allowed for concurrent collection of double dose plasma in the majority of the procedures.

[Spectrum of von Willebrand-Jürgens syndrome. A study on 53 patients]. / Spektrum des von-Willebrand-Jürgens-Syndroms. Eine Studie an 53 Patienten.

Von Willebrand-Jürgens syndrome was diagnosed in 53 patients on the basis of bleeding symptoms and blood clotting analytical findings. It was possible to classify the patients into four types using the recommendations of the European Thrombosis Research Organization. Type I, 56%, was most common, 15% belonged to type II, 13% to type III and 16% to type IV. Whereas type I corresponds to the so-called classical von Willebrand-Jürgens syndrome, types II-IV demonstrate the heterogeneity of the disease.