Comparison of collateral status in anterior circulation acute ischemic stroke on single-phase and multiphase CT angiography in prediction of clinical and radiological outcome

Objectives Various collateral scoring systems are used to assess the collateral status on single or multiphase CT angiography (CTA) to forecast outcomes in anterior circulation acute ischemic stroke patients. Our study aimed to compare the predictive ability of these collateral scoring systems in determining clinical and radiological outcomes in patients with anterior circulation acute ischemic stroke. Material and Methods In this observational prospective study, data was obtained from December 2020 to June 2022 in consecutive acute ischemic stroke patients referred to our department for neuroimaging. The collateral scores were assessed using Tan and Menon scoring systems described for single and multiphase CTA, respectively. The correlations between various collateral scores, the National Institute of Health Stroke Scale (NIHSS), Modified Rankin Scale (mRS), and final infarct volume were studied. Receiver operating characteristics (ROC) curves and multivariate logistic regression analysis were performed to assess the predictive ability of scoring systems for clinical and radiological outcomes Results A total of 32 patients met the inclusion criteria. Both single- and multiphase collateral scores showed statistically significant negative correlations with clinical and radiological outcomes. Spearman correlation coefficient and p-value for the radiological outcome being -Tan score (r- -0.73, p- < 0.001), single-phase Menon score (r- -0.81, p- < 0.001), and multiphase Menon score (r- -0.79, p- < 0.001). ROC curve analysis revealed that the multiphase Menon score performed slightly better than the single-phase Menon score (area under the curve [AUC], 0.815 vs 0.810) in predicting a favorable 90-day modified Rankin scale score. Conclusion Our study concluded that collateral status on both multiphase CTA (mCT) and conventional (Single phase arterial CTA) showed statistically significant results in the prediction of clinical and radiological outcomes.