Post-thrombectomy Intra-arterial Tenecteplase for Acute manaGement of Non-retrievable Thrombus and No-reflow in Emergent Stroke
Post-thrombectomy Intra-arterial Tenecteplase for Acute manaGement of Non-retrievable Thrombus and No-reflow in Emergent Stroke (EXTEND-AGNES TNK)
University of Melbourne
462 participants
Jun 1, 2024
INTERVENTIONAL
Conditions
Summary
Multicentre, prospective, Multi-arm Multi-stage (MAMS) seamless phase 2b/3 interventional randomized placebo-controlled double-blinded parallel-assignment (2 arms with 1:1 randomization) efficacy and safety trial to test intra-arterial tenecteplase at the completion of thrombectomy versus best practice in participants with anterior circulation LVO receiving mechanical thrombectomy within 24 hours of symptoms onset.
Eligibility
Inclusion Criteria6
- Adult participants (age≥18 years) presenting with ischemic stroke with arterial LVO on CT/MR Angiogram of the intracranial internal carotid or middle cerebral artery (MCA) first segment (M1) or proximal second segment (M2) committed to thrombectomy using standard criteria within 24 hours of onset:
- For 0-6 hours of symptom onset: Presence of arterial occlusion as defined above and ASPECTS≥3 on NCCT
- For 6-24 hours of symptom onset: Additional imaging criteria on CTP or MRI perfusion of core volume \<100ml.
- Qualifying CT/MR within 4hrs of randomisation (repeat CT for transferred participants required if \>4hr)
- Pre-stroke Modified Rankin Scale (mRS) score of ≤2 (mild pre-existing disability permitted)
- Local legal requirements for consent have been satisfied.
Exclusion Criteria14
- Intracranial hemorrhage identified by CT or MRI
- ASPECTS 0-2 on NCCT
- CTP or MRI perfusion ischemic core volume \>100ml if presenting within 6-24 hours from symptoms onset
- Anticipated endovascular stenting required for intracranial or extracranial atherosclerotic stenosis/occlusion.
- More than six retrieval attempts in the same vessel
- Alteplase being infused within 30 minutes (\~5x half-life) of anticipated trial drug administration
- Contraindication to imaging with contrast agents
- Any condition (eg.mid-arterial phase early venous filling) that in the judgment of investigators could impose hazards if study therapy is initiated
- Pregnant women.
- Current participation in another intervention research study that includes experimental interventions beyond standard-of-care.
- Anticoagulation. INR ≤1.7 if on warfarin, and dabigatran reversal by idarucizumab are permitted.
- Other standard contraindications to thrombolysis apart from time window.
- Known terminal illness such that the participants would not be expected to survive a year.
- Planned withdrawal of care or comfort care measures.
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Interventions
Intra-arterial tenecteplase (0.062mg/kg, maximum 6.25mg) administered as a bolus at the completion of thrombectomy through a microcatheter at the site of the initial-but-now-retrieved intracranial occlusion, or in direct contact with the residual thrombus
intra-arterial bolus of 0.9% Sodium Chloride solution
Locations(13)
View Full Details on ClinicalTrials.gov
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NCT05892510