# Preoperative local hemodynamics predict cerebral hyperperfusion syndrome after direct bypass for moyamoya disease: a quantitative CTP study based on ASPECT topography

## TL;DR

This study finds that preoperative blood flow measurements can predict a dangerous complication after brain surgery for moyamoya disease.

## Contribution

Quantitative CTP analysis using ASPECTS topography identifies new preoperative predictors of cerebral hyperperfusion syndrome.

## Key findings

- 11.7% of patients developed postoperative cerebral hyperperfusion syndrome.
- Advanced Suzuki stage and lower PCA Tmax are independent predictors of CHS.
- Combining these factors achieves 83% accuracy in predicting CHS risk.

## Abstract

Postoperative cerebral hyperperfusion syndrome (CHS) remains a common and serious complication after extracranial-intracranial (EC-IC) bypass for moyamoya disease (MMD). This study aimed to identify preoperative hemodynamic predictors of CHS using quantitative whole-brain CT perfusion (WB-CTP) analysis.

The author retrospectively analyzed 103 hemispheres from 89 MMD patients who underwent direct bypass from January 2024 to December 2024. Preoperative WB-CTP scans based on the Alberta Stroke Program Early CT score (ASPECTS) topography were processed to quantify cerebral blood flow (CBF) and time to peak (Tmax) across various brain regions, with the cerebellum serving as the reference. CHS was diagnosed based on clinical and radiological criteria. Univariable and multivariable logistic regression analyses were performed to identify independent predictors, and receiver operating characteristic (ROC) analysis was used to evaluate predictive performance.

Postoperative CHS occurred in 11.7% (12/103) of the included cases. Univariable analysis revealed Suzuki stage, moyamoya vessel density, and Tmax values in the thalamus (THAL) and posterior cerebral artery (PCA) regions as significant factors. Multivariable analysis confirmed advanced Suzuki stage (OR (95% CI), 8.87(1.44–54.45), p = 0.018), and lower PCA Tmax (OR (95% CI), 0.03 (0.00–0.69), p = 0.029) as independent predictors. ROC analysis demonstrated that combining Suzuki stage and PCA Tmax achieved an AUC of 0.83 (cut-off value = 0.060), indicating good discriminative performance for predicting postoperative CHS.

Advanced Suzuki stage and reduced PCA Tmax are independent risk factors for postoperative CHS after direct bypass in MMD patients. Preoperative ASPECTS-based quantitative CTP analysis can effectively stratify CHS risk and support individualized surgical planning and perioperative management.