Abstract
Purpose
Hemodynamics may play an important role in border zone infarct (BZI), but macroscopic and microscopic hemodynamics of BZI still remain unclear. This study aims to investigate arterial flow and tissue perfusion differences between BZI and non-BZI in patients with unilateral middle cerebral artery (MCA) territory infarcts.
Methods
Subacute ischemic stroke patients with unilateral infarcts at MCA territory were included. Imaging protocols included 4D flow, ASL (arterial spin labeling), and routine clinical brain MRI scan. A total of 56 patients (56.1 ± 11.9 years, 39 male) were included and divided as BZI (n = 26) and non-BZI (n = 30). BZI was further subdivided as cortical BZI (CBZI, n = 9), internal BZI (IBZI, n = 11), and mixed BZI (n = 6). Average blood flow (Flowavg), regional average cerebral blood flow (CBFavg) were compared between infarct and contralateral sides to test hemodynamic lateralization. Flow-index and CBF-index (infarct sides/contralateral sides) were compared between groups and subgroups.
Results
Flowavg and CBFavg showed significant lateralization in both BZI and non-BZI as well as CBZI and IBZI. Flow-index (0.51 ± 0.37 vs. 0.87 ± 0.36, p < 0.01) and CBF-index (0.70 ± 0.21 vs. 0.90 ± 0.19, p < 0.01) were significantly different between BZI and non-BZI but were not significantly different between CBZI and IBZI.
Conclusion
In summary, hemodynamic lateralization can occur in subacute stroke patients with BZI and non-BZI and the one that occurs in BZI tends to be more severe in view of arterial flow and tissue perfusion.
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Availability of data and material
Data supporting the findings of this study are available from the corresponding author on reasonable request.
Code availability
Code supporting the findings of this study are available from the corresponding author on reasonable request.
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Funding
This study is supported by the Beijing Municipal Science & Technology Commission (Z171100001017019), Tsinghua University initiative scientific research program (20219990033).
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Wenwen Chen: study design, data acquisition, data analysis, interpretation of the results, article writing; Xiaowei Song: study design, data acquisition, interpretation of the results, article editing; Zhensen Chen: data analysis, interpretation of the results, article editing; Shuo Chen: study design, interpretation of the results, article editing; Mingzhu Fu: data analysis, proofreading; Chenming Wei: interpretation of the results, proofreading; Zhuozhao Zheng: data acquisition, interpretation of the results; Jian Wu: data acquisition, interpretation of the results, article editing; Rui Li: study design, study supervision, interpretation of the results, article editing.
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The Ethical Review Board of the Beijing Changguang Hospital approved the study, and it was performed in accordance with the guidelines of the Declaration of Helsinki.
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Chen, W., Song, X., Chen, S. et al. Blood flow and perfusion lateralization in border zone infarct using 4D flow and arterial spin labeling. Neuroradiology 64, 2145–2152 (2022). https://doi.org/10.1007/s00234-022-02967-0
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DOI: https://doi.org/10.1007/s00234-022-02967-0