Stroke:小脑微出血的分布模式与脑淀粉样血管病

2019-08-29 杨中华 脑血管病及重症文献导读

脑微出血(Cerebral microbleeds,CMB)是脑小血管病(small vessel disease,SVD)的影像学特征,常见于自发性脑出血(intracerebral hemorrhage,ICH)并且进行了脑 MRI 磁敏感序列检查的患者。

脑微出血(Cerebral microbleeds,CMB)是脑小血管病(small vessel disease,SVD)的影像学特征,常见于自发性脑出血(intracerebral hemorrhage,ICH)并且进行了脑 MRI 磁敏感序列检查的患者。慕上 ICH 和 CMB 的空间分布有助于鉴别脑淀粉样血管病(CAA;主要累及慕上皮层和软脑膜血管)和高血压退行性小血管改变(小动脉硬化主要累及供应慕上深部灰质和白质的血管)。

有报道显示 CAA 和高血压微血管退行性变皆是小脑小动脉破裂导致小脑出血的可能机制。基于这个原因,Boston 标准并未把小脑 ICH 列入诊断CAA 的标准。不过,基于病理的证据提示小脑出血血肿的部位有助于判断 SVD 的病因(CAA vs 高血压退行性小血管病)。研究发现,当 CAA 是 ICH 潜在机制时,血肿通常位于小脑皮层和小脑蚓部(比如小脑表浅区域)。相反,当ICH 可能与高血压相关时,血肿大部分位于小脑灰质核团和深部白质(比如深部小脑区域)。与这些研究结果类似,我们最近的报道显示位于小脑表浅区域的自发性 ICH 患者MRI 上检测到慕上脑叶 CMB 的几率更高。相反,小脑深部 ICH 患者合并高血压的比例更高(vs 小脑表浅部位血肿)。

目前尚不知道 ICH 患者的小脑 CMB 空间分布是否与 SVD 的类型有关。2019年7月来自美国的Marco Pasi等在 Stroke 上公布了他们的研究结果,目的在于验乞位于小脑皮层和蚓部的 CMB 是否与临床诊断的 CAA 和病理确认的 CAA 有关。

共307例连续的自发性 ICH 患者,皆进行了基线 MRI 检查(包括 SWI 或 MRA)。根据地形模板(topographical template),小脑 CMB 模式分别定义为局限于表浅 vs 深部(小脑灰质核团和白质)或混合(两个区域受累)模式。36例 ICH 患者合并小脑 CMB 和病理结果。



下图 A 和 B,CAA-相关脑出血患者的轴位 SWI,可见局限于小脑浅表的微出血(箭头):



C 和 D 图,非-CAA-相关脑出血患者的轴位 SWI,显示混合模式小脑 CMB。C 图,小脑 CMB 位于深部小脑灰质和白质(短箭头)和浅表区域(长箭头)。D 图,同一患者可见位于小脑浅表区域的 CMB(箭头):



135(44%)例 ICH 患者的小脑检测到 CMB。在合并小脑 CMB 的患者中,85例(63%)为浅表模式,50例(37%)为深部/混合模式。局限于小脑的浅表 CMB 与慕上模式的可能 CAA-ICH(按照 Boston 标准)(odds ratio, 1.6; CI, 1.03–2.5)独立相关,深部/混合小脑 CMB 与深部/混合 ICH 模式独立相关(odds ratio, 1.8; CI, 1.2–2.7)。24例小脑浅表 CMB 者中23例(96%)被病理证实为 CAA,12例深部/混合小脑 CMB 者中3例(25%)被病理证实为 CAA(P< 0.001)。

最终作者认为对于 ICH 患者,小脑 CMB 相当常见,并且通常局限于浅表区域。局限于浅表的小脑 CMB 与临床诊断 CAA 和病理诊断 CAA 相关。

原始出处:Marco Pasi , Thanakit Pongpitakmetha , Andreas Charidimou, et al. Cerebellar Microbleed Distribution Patterns and Cerebral Amyloid Angiopathy: A Magnetic Resonance Imaging and Pathology-Based Study. Stroke. 4 Jun 2019

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