Abstract
Objective
Indirect bypass surgery, which induces spontaneous neoangiogenesis in ischemic brain tissue and improves cerebral blood flow, is an effective treatment for moyamoya disease (MMD). The time course of neoangiogenesis development has not yet been investigated. This study aimed to determine the critical period of neovascularization after indirect bypass in MMD patients.
Methods
Patients with MMD who underwent indirect bypass surgery at Peking University International Hospital between January 2015 and October 2017 were retrospectively reviewed. Surgically treated hemispheres with short-term (3–6 months) and long-term (1 year) follow-up digital subtraction angiography (DSA) were included. The effects of revascularization were evaluated on lateral and anteroposterior views using angiography and compared between two follow-ups of the same hemisphere.
Results
This study included 25 hemispheres from 24 MMD patients (mean age: 22.48 ± 14.83 years), among whom 13 were pediatric patients and 12 were adults. Qualitative measurements including the Matsushima scale and coverage of neoangiogenesis on anteroposterior views were not significantly different between the short term and long term (P = 0.083 and P = 0.157, respectively). Quantitative measurements including the greatest width and height of the area covered by neovascularization on lateral views of DSA and the greatest depth of neovascularization penetration on anteroposterior views (P = 0.488, 0.298 and 0.527, respectively) were also not significantly different. The mean count of newly formed veins was more at long-term than short-term follow-up (5.5 ± 2.5 vs. 5.1 ± 2.4, P = 0.005). Subgroup analysis of pediatric patients and adults yielded the same results as in the whole series.
Conclusion
After indirect bypass surgery, the major time window of arterial neoangiogenesis development was within 6 months after surgery. The general effect of revascularization was very similar in the short and long term; therefore, a follow-up angiography scheduled at 6 months after surgery is recommended. Growth of veins might continue after 6 months.
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Acknowledgements
We thank Chunxue Wu and **g Yuan for their contribution in assessment of radiological images.
Funding
This study was funded by the Ministry of Science and Technology of China, National Key Technology Research and Development Program (2015BAI12B04), by the National Natural Science Foundation of China (H0906 81571110 to Y.L. Zhao) and by the Training Plan of High-Level Technical Talents in the Bei**g Municipal Bureau of Health (2015-3-041).
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Y. Zhao, J. Lu, Q. Zhang, Y. Zhang, D. Zhang, R. Wang and Y. Zhao declare that they have no competing interests.
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Zhao, Y., Lu, J., Zhang, Q. et al. Time Course of Neoangiogenesis After Indirect Bypass Surgery for Moyamoya Disease. Clin Neuroradiol 30, 91–99 (2020). https://doi.org/10.1007/s00062-018-0748-3
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DOI: https://doi.org/10.1007/s00062-018-0748-3