Blood:针对特发性血小板增多症,阿司匹林优化抗血小板疗法的更佳用药方案

2020-04-14 MedSci原创 MedSci原创

特发性血小板增多症(ET)的特征是巨核细胞生成异常和血栓风险增加。推荐的抗血栓治疗方案:小剂量阿司匹林,每日一次(od);但加速血小板生成可能会缩短血小板环氧化酶(COX)-1抑制的持续时间。

特发性血小板增多症(ET)的特征是巨核细胞生成异常和血栓风险增加。推荐的抗血栓治疗方案:小剂量阿司匹林,每日一次(od);但加速血小板生成可能会缩短血小板环氧化酶(COX)-1抑制的持续时间。

研究人员开展了一多中心的双盲试验,评估三种阿司匹林方案优化血小板COX-1抑制、同时保留COX-2依赖性血管血栓阻力的效果。

共招募了245位长期服用小剂量阿司匹林的患者,按1:1随机分至 阿司匹林 100mg od组、每日两次(bid)或每日三次(tid)组,持续治疗2周。

在随机分组时和2周后,检测血清血栓素B2 (sTXB2)、血小板COX-1活性的有效生物标志物和尿前列环素代谢物(PGIM)排泄作为疗效和安全性的主要评估指标。此外,还研究了尿TX代谢物(TXM)排泄、胃肠道耐受性和ET相关症状。

采用bid和tid方案的可评估患者显示,个体间变异性显著降低,sTXB2的中位值降低:od组、bid组或tid组的sTXB2分别是19.3[9.7-40]、4 [2.1-6.7]和2.5[1.4-5.65] ng/ml。三组的尿PGIM具有可比性。在两个实验臂中,受试者的尿TXM均显著降低了35%。tid组患者腹部不适评分较高。

综上所述,目前推荐的75-100 od的心血管预防阿司匹林方案在降低绝大多数ET患者的血小板活化方面存在很大的不足。小剂量阿司匹林的抗血小板反应可通过缩短给药间隔至12小时得到明显改善,但再进一步减少给药间隔则无进一步改善。

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    2020-04-20 Midas

    qd,不去od。小编撅起屁股挨打~

    0

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