TY - JOUR T1 - Quantitative angiographic haemodynamic evaluation of bypasses for complex aneurysms: a preliminary study JF - Stroke and Vascular Neurology JO - Stroke Vasc Neurol DO - 10.1136/svn-2021-000858 SP - svn-2021-000858 AU - Junlin Lu AU - Chao Xue AU - Xulin Hu AU - Yuanli Zhao AU - Dong Zhang AU - Xiaolin Chen AU - Ji Zong Zhao Y1 - 2021/10/12 UR - http://svn.bmj.com/content/early/2021/10/12/svn-2021-000858.abstract N2 - Objective Open microsurgery, often with bypass techniques, is indispensable for complex aneurysms. To date, it remains unknown whether arterial anatomy or quantitative blood flow measurements can predict insufficient flow-related stroke (IRS). The present study aimed to evaluate the risk factors for IRS in patients treated with open microsurgery with bypass procedures for complex internal carotid artery aneurysms.Methods Patients with complex aneurysms undergoing bypass surgery were retrospectively reviewed. The recipient/donor flow index (RDFI) was preoperatively evaluated using colour-coding angiography. RDFI was defined as the ratio of the cerebral blood volume of the recipient and donor arteries. The sizes of the recipient and donor arteries were measured. The recipient/donor diameter index (RDDI) was then calculated. IRS was defined as the presence of new postoperative neurological deficits and infarction on postoperative CT scans. We assessed the association between RDFI and other variables and the IRS.Results Twenty patients (38±12 years) were analysed. IRS was observed in 12 patients (60%). Patients with postoperative IRS had a higher RDFI than those without postoperative IRS (p<0.001). RDDI was not significantly different between patients with and without IRS (p=0.905). Patients with RDFI >2.3 were more likely to develop IRS (p<0.001).Conclusion Quantitative digital subtraction angiography enables preoperative evaluation of cerebral blood volume. RDFI >2.3, rather than RDDI, was significantly associated with postoperative IRS. This preoperative evaluation allows appropriate decisions regarding the treatment strategy for preventing postoperative IRS.Data are available upon reasonable request. The data that support the findings of this study are available from the corresponding author upon reasonable request. ER -