The respective use of random (RPC) and apheresis (APC) platelet concentrates is highly heterogeneous among countries, ranging from 10 to 98% RPC in countries supposed to provide a similar transfusion service to patients. Moreover, when considering each country in the past 10 years, one can observe that some have changed their policy, switching from a majority of APC to RPC or vice versa. This presentation intends to analyse which factors may impact such decisions. For many years, the only available platelet component was a RPC obtained from whole blood donation by a two centrifugation steps process, the "platelet rich plasma" or PRP method. Since the beginning of the 1970s, APCs became available, with in fact many different techniques leading to many APCs that may not be equivalent. Since the end of the 1980s, a new method of RPC preparation was developed, using the buffy-coat (BC-PC), providing a blood component with highly preserved platelet functions as compared to RPCs prepared by the PRP technique. Finally, the use of each of these components either native, or leuco-reduced, or suspended in a storage solution, or processed with a pathogen inactivation technique adds new layers of complexity to compare them. Innumerable references can be found in the literature describing in vitro functional parameters of platelet concentrates. Although it is clear that BC-RPC retain much more their in vitro functions than PRP-RPC, indicating that no one should use the latter any more, it is much more difficult to distinguish differences between other PCs. Conversely, only a very few studies have been published related to a comparison of clinical efficacy of RPC versus APC, the endpoints being mainly CCI. Similarly to the in vitro studies, although RPC prepared with the PRP method show the lowest CCIs, no clear difference exists between "modern" RPC and APC. Another factor that may impact policy decision is the occurrence of adverse reactions in recipients. When considering only comparable data, for example leuco-reduced RPC versus leuco-reduced APC, there is now evidence that the latter is more associated with adverse reactions in recipients: data from hemovigilance in France show that, although no difference is noted for febrile non haemolytic transfusion reactions, nor for bacteria contamination, the incidence of allergic adverse reactions is about four times higher with APC as compared with RPC. Other aspects may impact the decision: the fact that using APC in place of RPC reduces the total donor exposure of patients was considered critical in some countries to reduce the risk of transmission of blood transmissible disease. Finally, the cost of the components, much higher for APC may be considered.

译文

随机 (RPC) 和单采 (APC) 血小板浓缩物在各国之间的使用高度异质性,在应该为患者提供类似输血服务的国家中,RPC的使用范围为10至98%。此外,在考虑过去十年中的每个国家时,可以观察到一些国家已经改变了政策,从大多数APC转向RPC,反之亦然。本演示文稿旨在分析哪些因素可能影响此类决策。多年来,唯一可用的血小板成分是通过两个离心步骤 (“富血小板血浆” 或PRP方法) 从全血捐赠中获得的RPC。自20世纪70年代开始以来,apc就可以使用,实际上有许多不同的技术导致许多apc可能不相等。自20世纪80年代结束以来,开发了一种使用血沉棕黄涂层 (bc-pc) 制备RPC的新方法,与通过PRP技术制备的RPC相比,提供了具有高度保留的血小板功能的血液成分。最后,使用这些成分中的每一种,无论是天然的,还是隐色减少的,或者悬浮在存储溶液中,或者用病原体灭活技术处理,都增加了新的复杂性来比较它们。在描述血小板浓缩物体外功能参数的文献中可以找到无数参考文献。尽管很明显bc-rpc比prp-rpc保留了更多的体外功能,这表明没有人应该再使用后者,但区分其他pc之间的差异要困难得多。相反,仅发表了很少的研究与RPC与APC的临床疗效比较有关,终点主要是CCI。与体外研究类似,尽管用PRP方法制备的RPC显示出最低的CCIs,但 “现代” RPC和APC之间没有明显的区别。可能影响政策决策的另一个因素是接受者中不良反应的发生。当仅考虑可比较的数据时,例如leuco降低的RPC与leuco降低的APC,现在有证据表明后者与接受者的不良反应更相关: 法国血液警戒的数据表明,尽管没有发现发热的非溶血性输血反应,也没有发现细菌污染,APC的过敏不良反应发生率是RPC的四倍。其他方面可能会影响该决定: 在某些国家,使用APC代替RPC减少患者的总供体暴露这一事实被认为对于降低血液传播疾病的风险至关重要。最后,可以考虑组件的成本,对于APC来说要高得多。

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