JAMA Neurol:血管内血栓切除术成功再灌注具有时间依赖性

2019-05-31 杨中华 脑血管病及重症文献导读

再灌注评价的方法通常采用 mTICI(modified thrombolysis in cerebral infarction)分级量表,0分代表持续完全闭塞,3分代表完全再灌注。因为2b 级是预防90天良好预后的最佳 cutoff 值,因此常把2b和3称为成功再灌注。

血管闭塞性(large-vessel occlusion,LVO)急性缺血性卒中(acute ischemic stroke,AIS)的挑战集中在降低再灌注的时间、筛选患者的优化影像学方法、以及最佳技术方法。再灌注与血管血栓切除术(endovascular thrombectomy,EVT)患者的临床预后明显相关。再灌注评价的方法通常采用 mTICI(modified thrombolysis in cerebral infarction)分级量表,0分代表持续完全闭塞,3分代表完全再灌注。因为2b 级是预防90天良好预后的最佳 cutoff 值,因此常把2b和3称为成功再灌注。

一项纳入了前五项随机临床卒中试验(主要采用了支架回收装置)的汇总分析显示成功再灌注率为71%,然而 mTICI 0-2a 级所占比例从12%到41%。成功再灌注受到很多因素影响,比如选择的设备和策略、静脉阿替普酶溶栓、侧枝状态和血栓大小、部位或成分。血栓的成分和特征会随着闭塞的时间发生迅速变化。虽然距离成功再灌注的时间严重影响到患者的临床预后,很少有研究探讨时间对成功再灌注率的影响。

2019年4月来自法国的Romain Bourcier等(HERMES 试验小组)在JAMA Neurology 上公布了他们的 meta 分析结果,目的在于分析AIS症状发作后不同时间间隔的 EVT 再通率。

从 HERMES 小组的七项随机试验中,作者选取了这些随机临床试验的干预组患者的数据,并且皆为M1/M2或颅内动脉闭塞经过 EVT 治疗的前循环 AIS。成功再灌注定义为EVT 结束时达到 mTICI 2b/3。

在728例患者中,平均年龄为65.4岁,47.4%为女性。他们发现随着从入院或首次影像学检测到股动脉穿刺时间的增加,EVT 的成功再灌注率逐渐下降。从入院到穿刺的时间每增加1小时,作用强度相对降低22%(OR, 0.78; 95%CI, 0.64 - 0.95);从影像到动脉穿刺的时间每增加1小时,作用强度相对降低26%(OR, 0.74; 95%CI, 0.59 - 0.93)。

最终作者认为随着从达到医院到股动脉穿刺时间的延长,再灌注率显着下降,因此作者认为对于前循环 AIS 患者应该尽可能缩短从发病到动脉穿刺的时间间隔。

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    2019-07-14 yinhl1978
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第二代支架取栓装置能够把闭塞颅内血管再通,改善急性缺血性卒中患者的预后。不过,内皮损伤不可避免,并引起动脉早期再闭塞。替罗非班是一种糖蛋白IIb/IIIa抑制剂,半衰期短,因此一些中心采用替罗非班防止局部血小板聚集,预防早期再闭塞。研究发现替罗非班用于急性中等缺血性卒中是安全的,能够降低5个月后的死亡率。对于急性缺血性卒中,采用全量阿替普酶立即桥接静脉内替罗非班也是安全和可行的。然而,一项研究