Patients with tandem occlusion or tandem lesion (TL), that is, stroke with an acute intracranial anterior circulation occlusion and an ipsilateral cervical ICA (c-ICA) high-grade stenosis or occlusion, constitute about 15-20% of patients undergoing endovascular thrombectomy (EVT). However, the optimal treatment of acute stroke patients with TL remains uncertain, as relatively few patients with TL were included in the major randomized controlled trials of EVT and management of the c-ICA was generally not specified by protocol nor analyzed post-hoc. Recent large multi-centre retrospective cases series suggest that acutely stented patients may have more favorable outcomes than patients treated with angioplasty alone or those with no acute ICA intervention, but high quality randomized trial data are lacking. EASI-TOC, a phase 3, academic multi-centre, controlled trial (PROBE design) with embedded pilot phase, will seek to determine if in patients undergoing acute intracranial thrombectomy for anterior circulation stroke with concurrent ipsilateral symptomatic high-grade (≥70%) atherosclerotic stenosis or occlusion of the extracranial ICA, endovascular ICA revascularization with stenting is superior to intracranial thrombectomy alone with regards to functional outcome at 90 days. Patients will be randomized to Acute stenting or No acute stenting (1:1 allocation).
EASI-TOC is a phase III multi-centre, prospective, randomized, open-label, blinded endpoint (PROBE) controlled trial (1:1 allocation). The trial will seek to determine if in patients undergoing acute intracranial thrombectomy for anterior circulation stroke with concurrent ipsilateral symptomatic high-grade (≥70%) atherosclerotic stenosis or occlusion of the extracranial ICA, endovascular ICA revascularization with stenting is superior to intracranial thrombectomy alone with regards to functional outcome at 90 days (measured using the Modified Rankin Scale). EASI-TOC will be conducted at 10-12 high-volume comprehensive stroke centres in Canada. 458 male and female adult (aged ≥ 18 years) patients will be enrolled. Patients will be randomized (1:1) to undergo acute ICA stenting during the thrombectomy procedure (either before or after intracranial thrombectomy, at the discretion of the treating physician) or to intracranial thrombectomy alone without ICA stenting. Deferred ICA intervention is allowed, if indicated. Randomization will be centralized and web-based. Stratification will be performed for use or not of IV alteplase and for enrolling site. Patients will be treated acutely and followed up to one year. Our primary hypothesis assumes a greater proportion of patients with 90-day mRS 0-2 in the stenting group versus the no stenting group (55% versus 40%). Assuming a minimal clinically important difference of 15 % between groups experiencing no crossover, a total of 173 patients per group would be sufficient to detect this difference, with a power of 80 % and a significance level of 5 %. Taking into account a cross-over rate of 10% (5% in either direction) and a loss to follow-up of 5 %, the total sample size will increase to 450 patients. Primary analysis will be by Intention-to-treat. Pre-specified as-treated, sex-specific and subgroup analyses will also be performed. Informed consent will be obtained from patients or their surrogate. Deferral of consent will be allowed if permitted by local ethics committees.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
458
The type of stent should be one commonly used for ICA stenting. Balloon angioplasty before and/or after stent placement will be allowed as required. Stenting should be performed after intracranial thrombectomy unless specific technical circumstances suggest that access to the intracranial circulation requires anterograde stenting. Embolic protection devices should not be used routinely during ICA stent placement.
The following antiplatelet regimen should be used: For patients having received IV thrombolysis, immediate post-procedural oral or intrarectal single antiplatelet agents, (Aspirin 325mg PO or 650mg PR). A second agent (usually Clopidogrel 300mg PO) is added after follow-up brain imaging at 12-24 hours confirms absence of significant ICH. For patients having not been treated with IV thrombolysis, dual antiplatelet therapy (Aspirin 325mg PO or 650mg PR and Clopidogrel 300-600mg PO) is given immediately post-procedure. Routine use of GPIIb/IIIa inhibitors, periprocedural IV Heparin is discouraged.
Centre Hospitalier de l'Université de Montréal
Montreal, Quebec, Canada
RECRUITINGClinical efficacy outcome: proportion of patients achieving a favorable modified Rankin scale score (mRS 0-2)
The proportion of patients achieving a favorable modified Rankin scale score (mRS 0-2) at 90 days (dichotomized) The Modified Rankin Score (mRS) is a 7 point disability scale with possible scores ranging from 0 to 6, with 0 indicating no disability and 6 indicating death.
Time frame: 90 days ± 14 days
Clinical efficacy outcome: Proportion of patients achieving a favorable modified Rankin scale score (mRS 0-2) at 90 days (dichotomized) according to sex
Proportion of patients achieving a favorable modified Rankin scale score (mRS 0-2) at 90 days (dichotomized) according to sex
Time frame: 90 days ± 14 days
Clinical efficacy outcome: Ordinal logistic regression for functional improvement on the Modified Rankin Scale (mRS) score (shift analysis)
Ordinal logistic regression for functional improvement by at least one mRS category at 90 days ("shift analysis") The Modified Rankin Score (mRS) is a 7 point disability scale with possible scores ranging from 0 to 6, with 0 indicating no disability and 6 indicating death.
Time frame: 90 days ± 14 days
Clinical efficacy outcome: Median National Institutes of Health Stroke Scale (NIHSS) score
Median NIHSS score at 24 hours after stroke The NIHSS is a 15 item neurologic examination that provides a quantitative measure of stroke-related neurologic deficit. (Scale from 0 to 42, with higher scores indicating a more severe neurologic deficit)
Time frame: 24 hours ± 8 hours
Clinical efficacy outcome: Median National Institutes of Health Stroke Scale (NIHSS) score
Median NIHSS score at 90 days after stroke The NIHSS is a 15 item neurologic examination that provides a quantitative measure of stroke-related neurologic deficit. (Scale from 0 to 42, with higher scores indicating a more severe neurologic deficit)
Time frame: 90 days ± 14 days
Clinical efficacy outcome: Median Modified Rankin Scale (mRS) score
Median mRS at 90 days after stroke The Modified Rankin Score (mRS) is a 7 point disability scale with possible scores ranging from 0 to 6, with 0 indicating no disability and 6 indicating death.
Time frame: 90 days ± 14 days
Clinical efficacy outcome: Rate of clinically confirmed recurrent ipsilateral stroke or retinal ischemia
Rate of clinically confirmed recurrent ipsilateral stroke or retinal ischemia within 90 days (imaging as clinically indicated) A structured telephone questionnaire for verifying stroke-free status will be used and relevant imaging reviewed
Time frame: 90 days ± 14 days
Radiological efficacy outcome: Proportion of patients with complete or near-complete recanalization
Proportion of patients with complete or near-complete recanalization (mTICI 2b/3) at the end of the endovascular procedure. mTICI score (0,1,2,2a,2b,3) : Grade 0 : no perfusion Grade 1 : penetration with minimal perfusion Grade 2 : partial perfusion Grade 2a : partial filling of less than 1/2 of the vascular territory Grade 2b : partial filling 50-99% of the vascular territory Grade 3 : complete perfusion Independent imaging core laboratory
Time frame: End of endovascular procedure
Radiological efficacy outcome: Proportion of patients with ICA thrombosis (with or without stent)
Proportion of patients with ICA thrombosis (with or without stent) within 90 days after stroke stent patency be evaluated by angiography at the end of the EVT procedure. Furthermore, follow-up carotid vascular imaging will be required between 1 and 90 days following stent placement in the context of usual care. Any non-invasive imaging modality will be allowed, with carotid doppler or CTA strongly recommended.
Time frame: 90 days ± 14 days
Clinical efficacy outcome: Median Montreal Cognitive Assessment (MoCA) score
Median Montreal Cognitive Assessment (MoCA) score at 90 days after stroke The MoCA is a 30-point screening tool for cognitive dysfunction (score from 0 to 30 with lower scores indicating greater cognitive impairment). The test assesses 8 domains of cognitive functioning: attention and concentration, executive functions, memory, language, visuoconstructional skills, conceptual thinking, calculations, and orientation.
Time frame: 90 days ± 14 days
Clinical efficacy outcome: Rate of any recurrent stroke or retinal ischemia
Rate of any recurrent stroke or retinal ischemia at 12 months after stroke A structured telephone questionnaire for verifying stroke-free status will be used
Time frame: 1 year ± 60 days
Clinical efficacy outcome: Proportion of patients achieving a favorable modified Rankin scale (mRS) score
Proportion of patients achieving a favorable modified Rankin scale score (mRS 0-2) at 12 months after stroke The Modified Rankin Score (mRS) is a 7 point disability scale with possible scores ranging from 0 to 6, with 0 indicating no disability and 6 indicating death.
Time frame: 1 year ± 60 days
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