Reperfusion measurements, treatment time, and outcomes in patients receiving endovascular treatment within 24 hours of last known well

AIMS: The aim of this study was to explore the interaction between reperfusion and treatment time on the outcomes of patients undergoing endovascular treatment presenting within 24 h of last known well, and to compare the predictive ability of different reperfusion measurements on outcomes. METHODS: Eligible patients from a single‐center cohort were enrolled in this study. Reperfusion was assessed using reperfusion index (decreased volume of hypoperfusion lesion compared with baseline) measured by repeated perfusion imaging, and modified treatment in cerebral ischemia score measured by digital subtraction angiography, respectively. The interactions between reperfusion measurements and treatment time on outcomes were explored using multivariate‐adjusted logistic and linear regression models. The predictive abilities of reperfusion measurements on outcomes were compared using area under the receiver operating characteristic curve (ROC‐AUC) and values of R‐square. RESULTS: Reperfusion index and treatment time had significant interactions on 3‐month modified Rankin Scale (mRS) 0–2 and infarct growth (p for interaction <0.05). Although the AUCs were statistically similar (AUCs of mRS 0–2 prediction, mTICI≥2b:0.63, mTICI≥2c:0.59, reperfusion index≥0.5:0.66, reperfusion index ≥0.9:0.73, P value of any of the two AUCs >0.05), reperfusion index≥0.9 showed the highest R‐square values in outcome prediction (R‐square values of 3‐month mRS 0–2 and infarct growth = 0.21) among all the reperfusion measurements. CONCLUSION: Treatment time mitigated the effect of reperfusion on outcomes of patients receiving endovascular treatment within 24 h of last known well. Reperfusion index≥0.9 might serve as a better proxy of good outcomes compared with other reperfusion measurements.