Collateral Predictors of Neovascularization After Indirect Revascularization in Adult Patients with Moyamoya Disease: A Single-Center Retrospective Study
Abstract Objective. The underlying factors of neovascularization after indirect bypass in the adult patients with moyamoya disease (MMD) remained unknow. The aim of this study was to explore potential predictors based on collateral characteristics for neovascularization after indirect bypass in adult MMD patients. Methods. The adult MMD patients treated by indirect bypass in a single-institution from August 2012 and January 2018 were retrospectively selected into our research. The collaterals based on cerebral angiography were classified into the following subtypes: intracerebral anastomosis, duro-cortical anastomosis, and leptomeningeal anastomosis. Neovascularization evaluation was based on Matsushima classification, with “good” collateral formation in level 2 and 3, and poor formation in level 0 and 1. Univariate and multivariate analyses were performed to identify neovascularization predictors after indirect bypass. Results. A total of 86 patients (97 hemispheres) (mean ± SD age 35.06 ± 15.09 years, range 18–61 years) were retrospectively included. Preoperative collateral circulation included intracerebral anastomosis in 49 (50.5%) cases, duro-cortical anastomosis in 19 (19.6%) cases, and leptomeningeal anastomosis in 29 (29.9%) cases, respectively. Postoperative good neovascularization was observed in 56 (57.7%) hemispheres. Multivariate analysis showed that intracerebral anastomosis (P<0.001, OR [95% CI] 2.984 [2.031-5.437]) was associated with favorable neovascularization, whereas older age (P<0.001, OR [95% CI] 0.827 [0.793-0.916]) and hemorrhagic onset (P<0.001, OR [95% CI] 0.138 [0.054–0.353]) were significantly associated with poor neovascularization. Hemispheres in the good neovascularization had lower modified Rankin scale score, and better long-term improvement than those in the poor neovascularization. Conclusions. Hemorrhagic onset and old age predict poor neovascularization after indirect bypass, while duro-cortical anastomosis and intracerebral anastomosis predict good neovascularization. Good neovascularization was associated with better long-term outcomes. The current study provides a basis for the selection of surgical procedure for MMD candidates.