Haemophilia:艾美赛珠单抗对心脏手术患者血液样本中活化凝血时间的体外影响

2021-11-11 MedSci原创 MedSci原创

FVIII 抑制剂可广泛延长肝素化全血中的 ACT,并且艾美赛珠单抗的临床水平部分逆转 ACT 值。在艾美赛珠单抗治疗的 FVIII 抑制剂患者中,应考虑鱼精蛋白滴定以进行最佳肝素监测。

使用凝血因子 VIII (FVIII) 抑制剂的血友病 A (HA) 患者的肝素管理可能会因严重的活化凝血时间 (ACT) 延长而具有挑战性。因此,更好地了解艾美赛珠单抗、FVIII 模拟物对 ACT 和基于组织因子 (TF) 的凝血测定的影响非常重要。



国外一研究团队将来自 18 名接受体外循环 (CPB) 的患者的全血在体外与混合的正常血浆、FVIII 缺乏或 FVIII 抑制剂血浆混合,以影响功能性 FVIII 水平。通过鱼精蛋白滴定法测量全血混合物中的 ACT 和肝素浓度,使用/不使用艾美赛珠单抗 (50-100 μg/ml),在与正常血浆或 FVIII 抑制剂血浆混合的患者血浆中测量凝血酶生成和纤溶酶生成,以评估低 TF 激活下艾美赛珠单抗的影响。研究刊登在期刊Haemophilia

结果显示,与基线时正常血浆混合物中的相比,FVIII 抑制剂使 ACT 延长了 2.2 倍。在 CPB 期间,正常血浆混合物和 FVIII 缺乏混合物中的 ACT 为 400 秒,但 FVIII 抑制剂混合物中的 ACT 达到 900 秒。在正常血浆混合物和缺乏 FVIII 的混合物中,艾美赛珠单抗可将 ACT 缩短多达 100 秒。尽管添加了 100 μg/ml 的艾美赛珠单抗,但 FVIII 抑制剂混合物中的 ACT 仍超过 600 秒。通过基于 TF 的鱼精蛋白滴定法测量的肝素浓度不受影响。艾美赛珠单抗在 FVIII 抑制剂存在时增强凝血酶峰值,而纤溶酶生成主要受凝血酶生成和 ɛ-氨基己酸的全身使用影响。

综上所述,FVIII 抑制剂可广泛延长肝素化全血中的 ACT,并且艾美赛珠单抗的临床水平部分逆转 ACT 值。在艾美赛珠单抗治疗的 FVIII 抑制剂患者中,应考虑鱼精蛋白滴定以进行最佳肝素监测。

 

原始出处:

Tanaka, KAHenderson, RThangaraju, K, et al. In vitro effects of emicizumab on activated clotting time in blood samples from cardiac surgical patientsHaemophilia202118https://doi.org/10.1111/hae.14452

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    2022-02-26 zhzhxiang
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    2022-08-24 changfy
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    2021-11-11 1209e435m98(暂无昵称)

    学习了,谢谢分享

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