Random-donor platelet concentrates (PC) prepared from pooled buffy coats have recently been described as an alternative method for platelet preparation. We evaluated such PCs in the clinical setting compared with a standard PC from platelet apheresis. PCs were prepared either from pools of buffy coats (BC-PC) or from single donors (SD-PC) with the cell separator CS-3000 plus. PCs were stored for up to 5 days before transfusion. We compared fresh PC (day 1) with stored (day 2-3) and long-stored PC (day 4-5). For analysis, platelet increment in the recipient was determined immediately and 16-22 h (mean 20 h) after transfusion, corrected for total body area and transfused platelets (CCI). A total of 316 PCs were administered to 36 thrombocytopenic patients suffering from various hematological disorders. Patients with detectable HLA or platelet-specific antibodies or splenomegaly were excluded from the study. Mean platelet content of the PC was 262 x 10(9) for BC-PC and 251 x 10(9) for SD-PC. The 20-h CCI after transfusion of fresh PC was slightly higher with BC-PC than with SD-PC (14.5 versus 11.9; p = 0.19), but values did not differ significantly between the two types of PC on any day of storage. For BC-PC, 20-h CCI decreased with further storage by 30% (10.2; p = 0.02). For SD-PC a decrease by 9% was not significant. In conclusion, platelet concentrates prepared from pools of buffy coats showed excellent transfusion results when administered fresh, but storage decreased the CCI by 30%. No significant difference from PCs from plateletpheresis was observed on any day of storage. Both types of platelet concentrates were capable of sufficient platelet increment even when stored for up to 5 days.
Zusammenfassung. Die vorliegende Querschnittsuntersuchung (N = 708 Familien) versuchte unter Berücksichtigung wichtiger Kovariaten wie z.B. des elterlichen Erziehungsverhaltens oder sozioökonomischer Variablen Zusammenhänge zwischen der Nutzung elektronischer Medien, Verhaltensauffälligkeiten und ADHS zu identifizieren. Nach der SÖS (sozioökonomischer Status) – Mainstreaming Hypothese würden die stärksten Zusammenhänge für Kinder mit hohem SÖS erwartet, währenddessen nach der SÖS-Resonanz Hypothese diese vor allem für Kinder mit niedrigem SÖS erwartet werden würden. Ergebnisse: Es zeigten sich signifikante Zusammenhänge zwischen der täglichen Fernsehnutzung und vermehrten Schlafproblemen, aggressivem Verhalten sowie Aufmerksamkeitsproblemen. Eine tägliche Computernutzung wies hingegen einen Zusammenhang mit geringeren Aufmerksamkeitsproblemen auf. In Abhängigkeit des SÖS der Mütter folgten die Zusammenhänge (v.a.) hinsichtlich der Fernsehnutzung und internalisierendem Verhalten in gewissem Maße den Vorhersagen einer Resonanz-Hypothese, währenddessen in Abhängigkeit des SÖS der Väter diese eher einer Mainstreaming-Hypothese entsprachen. Zukünftige Forschungsarbeiten können profitieren, wenn diese Moderationen im Untersuchungsdesign stärker berücksichtigt würden.
By treatment of the mouse leukemia L 1210 with cytosinarabinoside (120 mg/kg per week) a tumour cell line was developed which was resistant to this cytostatic agent. It is possible, using the short-term test, to follow the development of resistance to cytosinarabinoside.
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