Neurology:重度小血管病变患者磁感加权成像血管簇征的发生率及意义 

2022-07-11 Naomi MedSci原创

磁共振磁化率加权成像(SWI)可以识别由于其感应磁场干扰而含有脱氧血液的脑小血管。研究发现,血管簇或对应于白质中扩张最大的血管,接近完全组织损伤和空化。这一新特征的病理生理学意义值得进一步的纵向研究。

磁共振磁化率加权成像(SWI)可以识别由于其感应磁场干扰而含有脱氧血液的小脑血管。研究人员在严重小血管疾病(SVD)的白质SWI上观察到可能扩张的小血管的焦点簇。近日,一项发表在Neurology上的研究评估了散发性SVD患者和伴有皮质下梗塞和白质脑病的常染色体显性遗传性脑动脉病(CADASIL)患者的患病率、与SVD病变和血管反应性的关系。

 对一项对散发性SVD或CADASIL患者的前瞻性多中心观察研究(Investigate-SVD)进行了二次横断面分析,研究对象为散发性SVD或CADASIL患者(Investigate-SVD),包括血氧水平依赖的MRI脑血管反应性(CVR)。两位独立评分者对SWI序列进行了评估,以确定白质中的“血管簇”是具有小血管外观的焦点低信号点/线(评价者 一致性,kappa统计量=0.66)。在结构性MRI序列上评估了每名患者和每组患者与SVD病变类型和严重程度的相关性。还以对侧体积为参照,评估了血管丛内和周围2-体素同心间期的CVR。

  • 在登记的77名患者中,76人有可用的SWI序列,45人患有散发性SVD[平均年龄64岁(SD 11),男性26人(58%)],31人患有CADASIL[53岁(11人),男性15人(48%)]。
  • 我们在36/76例患者中发现了94个血管簇(15/45例散发性SVD,21/31例CADASIL)。在协变量调整分析中,与无血管簇组相比,有血管簇组的脑白质有更多的腔隙(OR,95%CI)(1.30,1.05~1.62),较高的脑白质高信号(WMH)体积(Per-log10增加,1.92,1.04~3.56),较低的CVR(PER%/mm Hg,0.77(0.60~0.99))。
  • 在94个脉管团中,57个(61%)对应于流体衰减反转恢复的非空化或部分空化的WMH,37/94(39%)对应于完全空洞。
  • 在有完整空洞的血管簇内,CVR幅度低于相应的对侧体积[平均差(SD),t,p],而在未完全空化的血管簇内,血管簇体积[-0.00046(0.00088),-3.021,0.005]和周围4个体素的体积扩张壳[-0.00011(0.00031),-2.140,0.039;-0.00010(0.00027),-2.295,0.028]均低于对侧。

血管簇可能对应于白质中扩张最大的血管,接近完全组织损伤和空化。这一新特征的病理生理学意义值得进一步的纵向研究。

文献来源:Rudilosso S, Chui E, Stringer MS, et al. Prevalence and Significance of the Vessel-Cluster Sign on Susceptibility-Weighted Imaging in Patients With Severe Small Vessel Disease [published online ahead of print, 2022 May 23]. Neurology. 2022;10.1212/WNL.0000000000200614. doi:10.1212/WNL.0000000000200614

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    2023-05-19 yinhl1978
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