Chest:IVIg能否治疗肝素诱导血小板减少症?

2017-10-17 王淳 环球医学

2017年9月,发表在《Chest》上的一项研究,调查了严重难治性肝素诱导血小板减少症(HIT)患者是否可以考虑IVIg进行治疗。研究结果证实:IVIg治疗应该被患有严重疾病且标准疗法难以治疗的HIT患者考虑。

2017年9月,发表在《Chest》上的一项研究,调查了严重难治性肝素诱导血小板减少症(HIT)患者是否可以考虑IVIg进行治疗。研究结果证实:IVIg治疗应该被患有严重疾病且标准疗法难以治疗的HIT患者考虑。

背景:HIT相关的严重血小板减少症和血栓形成可能造成重大的治疗挑战。在这种情况下使用替代抗凝药可能增加出血风险,尤其是具有长期疾病过程的患者。在严重感染的患者人群中,缺乏额外的治疗方法。

方法:研究人员描述了3名HIT且患有严重血栓栓塞以及标准治疗难以治疗的延长血小板减少症患者,但IVIg疗法能达到立即和持续的反应。在这些患者和5名额外的严重HIT患者中,评估IVIg作用的机制。同时还考察了血小板IgG受体FcγRIIa常见的多态性(H/R 131)对IVIg介导的血小板激活抑制的影响。

结果:在体内达到水平时,IVIg能抑制HIT抗体介导的血小板激活。这种作用需IgG的常数域(Fc),但不需要抗原结合部分。与结果一致,固相免疫测定(血小板因子4酶联免疫测定)中IVIg对HIT抗体结合没有作用。FcγRIIa中H/R131多态性能影响血小板对IVIg治疗的敏感性,HH131基因型对抗体诱导激活的IVIg介导的抵制最为敏感。但是,高剂量IVIg,所有FcγRIIa基因型的血小板激活均被显着抑制。直接口服抗凝药的长期抗凝治疗3名患者效果较好。

结论:这些研究证实IVIg治疗应该被患有严重疾病且标准疗法难以治疗的HIT患者考虑。

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    2017-10-19 xre2014

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