Related Experiment Video
Updated: Aug 6, 2026

A Fibrin-Enriched and tPA-Sensitive Photothrombotic Stroke Model
Published on: June 4, 2021
Radiological thrombus characteristics and the effect of tenecteplase versus alteplase on outcomes in acute ischemic
Fouzi Bala1,2, Katrina Hannah Dizon Ignacio2, Nishita Singh2,3
1Diagnostic and Interventional Neuroradiology Department, University Hospital of Tours, Tours, France.
Background:
To determine whether computed tomography (CT) thrombus characteristics modify the effect of intravenous (IV) thrombolysis type (tenecteplase vs alteplase) on outcomes.
Methods:
This is a secondary analysis of the Alteplase compared to Tenecteplase (AcT) trial. Patients with visible intracranial occlusions on thin-slice baseline imaging were included. Key thrombus characteristics assessed by CT imaging were hyperdense artery sign, thrombus length, residual flow, clot burden score, and occlusion site. Multivariable analyses were performed to test for interactions between thrombolysis type and thrombus characteristics on clinical and angiographic outcomes.
Results:
Of 1577 patients, 939 met inclusion criteria; 479 (51.0%) received tenecteplase and 460 (49.0%) alteplase. Among the 498 patients (53.0%) treated with endovascular thrombectomy (EVT), angiographic outcomes were comparable between treatment groups. A significant interaction was observed between thrombolysis type and thrombus length; longer thrombi were associated with reduced likelihood of modified Rankin Scale (mRS) 0-1 with alteplase (adjusted odds ratio (aOR) per 1 mm increase, 0.97 (95% confidence interval (CI): 0.95-1.00)), but not with tenecteplase (aOR: 1.00 (95% CI: 0.98-1.02); interaction p = 0.04). Similarly, the presence of residual flow within the thrombus was associated with higher odds of mRS 0-2 in the alteplase group (aOR: 2.00 (95% CI: 1.25-3.20)), but had no significant effect in the tenecteplase group (aOR: 0.93 (95% CI: 0.62-1.41); interaction p = 0.01). No other significant interactions between thrombus characteristics and thrombolysis type were identified.
Conclusion:
In the AcT trial, alteplase appeared less effective with longer thrombi and those lacking residual flow, whereas IV tenecteplase showed more consistent effectiveness across thrombus characteristics. These findings require confirmation in future prospective studies.
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