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Thromb Haemostasis:补充硝酸盐可作为CAD患者降低血栓形成风险的一种新方法?

2018-02-27 谈志远 环球医学网

2018年发表在《Thromb Haemost》的一项由英国科学家进行的概念验证、随机、双盲、安慰剂对照、交叉研究,考察了硝酸盐补充剂对冠状动脉疾病(CAD)患者循环细胞外囊泡(EVs)的影响:氯吡格雷治疗vs无氯吡格雷治疗。

2018年发表在《Thromb Haemost》的一项由英国科学家进行的概念验证、随机、双盲、安慰剂对照、交叉研究,考察了硝酸盐补充剂对冠状动脉疾病(CAD)患者循环细胞外囊泡(EVs)的影响:氯吡格雷治疗vs无氯吡格雷治疗。

背景: EVs与心血管疾病(CVD)的发病机制有关。具体来说,血小板衍生的EVs是高度促凝,促凝血酶生成和纤维蛋白凝块形成的。在CVD中,硝酸盐补充剂通过增加一氧化氮(NO)的生物利用度,可发挥有益的作用。氯吡格雷能够产生NO供体型化合物,如在亚硝酸盐和低PH的情况下,可产生S-亚硝基硫醇(RSNO)。

目的:本研究旨在评估,氯吡格雷治疗vs无氯吡格雷治疗情况下,硝酸盐补充剂对CAD患者循环EVs的影响。

方法:在这项随机、双盲、安慰剂对照研究中,将接受(n=10)或未接受氯吡格雷治疗(n=10)的CAD患者分成接受膳食硝酸补充剂组或同等安慰剂组。采用基于臭氧的化学发光法和多电极聚集法测定NO代谢产物和血小板活性。使用纳米粒子示踪分析法和时间分辨荧光测定法确定EV浓度和原点。

结果:仅在氯吡格雷组与安慰剂组进行比较时,随着硝酸盐的补充,血浆RSNO随之升高 (4.7±0.8 vs 0.2±0.5 nM),凝血酶受体介导的血小板聚集随之减少(19.9±6.0 vs 4.0±6.4 U)。同安慰剂相比,在这个组中的循环EVs显着减少(-1.183 e11±3.15 e10 vs -9.93 e9±1.84 e10 EVs /ml),尤其是CD41 +EVs的比例(-2120±728 vs 235±436 RFU[相对荧光单位])。体外试验证明,氯吡格雷-SNO可以直接减少血小板-EV(6.209 e10±4.074 e9 vs 3.94 e11±1.91 e10 EVs /ml)。

结论:总之,在氯吡格雷治疗的CAD患者中,硝酸盐补充剂减少了血小板衍生出的EVs,提高了患者对氯吡格雷的应答性。在CAD患者中,硝酸盐补充剂可能代表了降低血栓形成风险的一种新方法。

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    2019-01-11 paperyu
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    2018-04-10 mhm289
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    2018-10-23 changfy
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    2018-03-04 海之蓝

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Medscape 11月2日报道了一项有趣的实验结论:日常饮用甜菜根汁可以显著降低血压。甜菜根汁中起作用在于其含有的硝酸盐成分。在这一项为期四周的随机对照的实验里,英国伦敦的Vikas Kapil博士的研究团队观察到了和安慰剂对照组相比每日常规饮用甜菜根汁可以使舒张压和收缩压都显著下降。研究中实验设计是这样的:实验组病人每日饮用250ml甜菜根汁,硝酸盐含量约6.4mmol/day,安慰剂对照组服

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