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影像学评估-1HMRS
1HMRS能检测与急性脑梗死有关的乳酸盐(Lac)改变 梗死区中央的Lac峰值明显高于周边部分,提示周边部分可能是存在缺血但尚
未梗死的可逆组织,即缺血半暗带存在(缺血脑组织Lac出现的水平并不一致, 缺血严重的区域和对缺血较敏感的脑区Lac水平常更高,侧支循环出现情况不 同Lac水平也不同。 ) Lac水平最高的部位,常是NAA降低最严重的部位。在全脑或局灶性脑缺血时, NAA均可下降。梗死区NAA并非均匀减少,中心区NAA减少比病灶周边更明 显, NAA 在病灶内提示可能还有存活的神经元,即所谓“缺血半暗带”。
EIC定义为(1)灰白质模糊区域或与其有相同结构的部位或对侧半球脑组织相比密度降低区域;(2)
局部肿胀或占位效应(由于临近组织压迫而导致脑脊液腔任何部位狭窄)。
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Treatment recommendations
Mechanical thrombectomy, in addition to intravenous thrombolysis within 4.5 h when eligible, is recommended to treat acute stroke patients with large artery occlusions in the anterior circulation up to 6 h after symptom onset (Grade A, Level 1a, KSU Grade A). – new
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ASPECTS (Alberta Score Program Early CT Score) on plain CT
The MR CLEAN trial subgroup analysis showed benefit of thrombectomy for patients with ASPECTS scores of 5 or more points (5–7 points, OR 1.97 and 8– 10 points, OR 1.61, respectively) but probably not with ASPECTS scores 0–4 (OR 1.09, 95% CI 0.14–8.46).