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Combined Thrombectomy for Distal MediUm Vessel Occlusion StroKe

Recruiting
18 years of age
Both
Phase N/A

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Overview

A phase III, randomized, multi-center, investigational, open label clinical trial that will examine whether treatment with endovascular thrombectomy is superior to standard medical therapy alone in patients who suffer a Distal Medium Vessel Occlusion Ischemic Stroke within 12 hours from time last seen well

Description

DUSK is a Phase-3, prospective, multicenter, investigational, randomized, controlled, open-label study with blinded endpoint evaluation (PROBE design) and an adaptive design with population enrichment. The randomization employs a 1:1 ratio of endovascular thrombectomy (EVT) versus standard medical management (SMM) in patients who suffer a distal medium vessel occlusion (DMVO) stroke within 12 hours from time last seen well (TLSW) and have evidence of salvageable brain tissue on perfusion imaging. Randomization will be done under a minimization process using age (≤67 vs. >67 years), baseline NIHSS (≤12 vs. >12), use of IV thrombolysis (none vs. within 120 minutes from randomization vs. > 120 minutes from randomization), site of occlusion (M2 vs. M3 vs. ACA vs. PCA), baseline infarct volume (≤15mL vs. >15-30mL vs. >30-50mL), perfusion mismatch volume (≤15mL vs. >15-30mL vs. >30-50mL), therapeutic window (0-4.5 vs. 4.5-8 or >9-12 hours after TLKW), and participating site. The candidate enriched populations that the trial considers are based on use of intravenous thrombolysis (none vs. within 120 minutes from randomization vs. > 120 minutes from randomization), TLKW to randomization (0-6 vs. 6-12 hours) and mismatch volumes as measured using absolute mismatch (defined as Tmax>6 sec - DWI lesion on MRI or Tmax>6 sec -rCBF<30% lesion on CTP) (>40 cc vs. >30cc vs. >20cc vs. >10cc). The primary endpoint will be a categorical shift across all levels on the modified Rankin Scale (mRS) at 90-days post-randomization. The hypothesis is that EVT will lead to an improved clinical outcome at 90 days. Interim analysis will be performed after the primary endpoint is available for a total of 386 randomized patients.

Eligibility

Inclusion Criteria:

  1. Age ≥18 years (no upper age limit)
  2. Acute ischemic stroke where patient is ineligible for or has failed IV thrombolytic treatment and is ineligible for endovascular treatment under best guideline-based care due to absence of proximal arterial occlusion (e.g. intracranial ICA, MCA-M1 and co-dominant or dominant M2* segments, and vertebrobasilar arteries).***
    • IV thrombolytic treatment failure is defined by persistent disabling neurological deficits beyond 60 minutes of completion of thrombolytic infusion in the presence of imaging findings consistent with DMVO.
             **Dominant M2 segment is defined is a division supplying >50% of the MCA territory vs
             co-dominant supplying 50% of the MCA territory vs non-dominant supplying <50% of the
             MCA territory.
             ***No procedures or tests required by the protocol will delay fastest possible
             delivery of thrombolytic therapy to potentially eligible subjects.
          3. Evidence of a primary (e.g. not secondary to EVT of proximal vessel occlusion) distal
             medium vascular occlusion defined as occlusion of the non-dominant M2 segment or M3
             segment of the MCA, the ACA (A1, A2, or A3 segments), or the PCA (P1, P2 or P3
             segments) resulting in significant clinical deficits and expected to be treatable by
             endovascular thrombectomy. Non dominant M2 segment vessel diameter should not exceed
             2.5mm.
          4. No significant pre-stroke functional disability (mRS ≤2)
          5. Evidence of a disabling stroke defined as follows:
               1. Baseline National Institutes of Health Stroke Scale (NIHSS) score >5 at the time
                  of randomization.
               2. NIHSS 3-5 with disabling deficit including significant aphasia, neglect,
                  hemianopsia, or hemiparesis/ loss of hand or leg function as established by the
                  treating team in context of the patient's life.
          6. The presence of a Target Mismatch defined as:
               1. Ischemic Core < 50cc (defined on NCCT/CTP* or DWI-MRI)
                  *Visual or automatedly detected hypodensity on NCCT should be used to exclude or
                  include patients if the investigator believes that their assessment is more
                  reliable than the CTP volume in any particular case.
               2. Mismatch Volume (TMax >6sec lesion - Core volume lesion) >10cc
               3. Mismatch Ratio >1.4
          7. Patient treatable within 12 hours of symptom onset. Symptoms onset is defined as the
             point in time the patient was last seen well (at baseline). Treatment start is defined
             as the time of arterial puncture.
          8. Informed consent obtained from patient or acceptable patient surrogate
        Exclusion Criteria:
          1. Any sign of intracranial hemorrhage on baseline CT/MR (SDH/SAH/ICH).
          2. Rapidly improving symptoms, particularly if in the judgment of the managing clinician
             that the improvement is likely to result in the patient having no residual disabling
             deficits and an NIHSS score of <5 at randomization.
          3. Significant ischemic changes in a territory other than the occluded site that in the
             opinion of the investigator could reduce the benefit of endovascular treatment.
          4. Contra indication to imaging with MR or CT with contrast agents.
          5. Infarct core >1/3 occluded territory (MCA, ACA, or PCA) qualitatively or >50 mL
             quantitatively (determined by NCCT, CTP or DWI).
          6. Any terminal illness such that patient would not be expected to survive more than 1
             year.
          7. Recent past history or clinical presentation of ICH, subarachnoid hemorrhage (SAH),
             arterio-venous (AV) malformation, aneurysm, or cerebral neoplasm other than
             meningioma.
          8. Any imaging findings suggestive of futile recanalization in the judgment of the local
             investigator.
          9. Premorbid disability (mRS ≥3).
         10. Inability to initiate endovascular treatment within 12 hours of last known well.
         11. Seizures at stroke onset if it precludes obtaining an accurate baseline NIHSS.
         12. Baseline blood glucose of <50 mg/dL (2.78 mmol) or >400 mg/dL (22.20 mmol).
         13. Known history of hereditary or acquired hemorrhagic diathesis and/or platelet count
             <100,000/uL.
         14. Known renal failure as defined as serum creatinine levels > 3.0 mg/dL.
         15. Presumed septic embolus or suspicion of bacterial endocarditis.
         16. Any other condition that, in the opinion of the investigator, precludes an
             endovascular procedure or poses a significant hazard to the subject if an endovascular
             procedure was performed.
         17. History of drug or alcohol use or dependence that, in the opinion of the site
             investigator, would interfere with adherence to study requirements.
         18. Subjects with occlusions in multiple vascular territories (e.g., bilateral or
             multi-territorial anterior circulation, or anterior/posterior circulation)
         19. Subject participating in a study involving an investigational drug or device that
             would impact this study
         20. Known pregnancy
         21. Prisoner or incarceration
         22. Known acute symptomatic COVID-19 infection

Study details

Ischemic Stroke

NCT05983757

Raul Nogueira

1 May 2024

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