Inclusion Criteria- 1. Acute ischemic stroke where patient is ineligible for IV thrombolytic treatment or the treatment is contraindicated (e.g., subject presents beyond recommended time from symptom onset), or where patient has received IV thrombolytic therapy without recanalization after a minimum of 30 min from start of iv tPA infusion
- 2. No significant pre-stroke functional disability (mRS ≤ 1)
- 3. Baseline NIHSS score obtained prior to randomization must be equal or higher than 6 points
- 4. Age ≥18 and ≤ 85.
- 5. Occlusion (TICI 0-1) of the intracranial ICA (distal ICA or T occlusions), MCA-M1 segment or tandem proximal ICA/MCA-M1 suitable for endovascular treatment, as evidenced by CTA, MRA or angiogram, with or without concomitant cervical carotid occlusion or stenosis
- 6. Patient treatable within eight hours of symptom onset. Symptoms onset is defined as point in time the patient was last seen well (at baseline). Treatment start is defined as groin puncture.
- 7. Informed consent obtained from patient or acceptable patient surrogate
Exclusion Criteria- Clinical criteria
- 1. Known hemorrhagic diathesis, coagulation factor deficiency, or oral anticoagulant therapy with INR > 3.0
- 2. Baseline platelet count < 30.000/µL
- 3. Baseline blood glucose of < 50mg/dL or >400mg/dl
- 4. Severe, sustained hypertension (SBP > 185 mm Hg or DBP > 110 mm Hg)
- 5. Patients in coma (NIHSS item of consciousness >1) (Intubated patients for transfer could be randomized only in case an NIHSS is obtained by a neurologist prior transportation).
- 6. Seizures at stroke onset which would preclude obtaining a baseline NIHSS
- 7. Serious, advanced, or terminal illness with anticipated life expectancy of less than one year.
- 8. History of life threatening allergy (more than rash) to contrast medium
- 9. Subjects who has received iv t-PA treatment beyond 4,5 hours from the beginning of the symptoms
- 10. Renal insufficiency with creatinine ≥ 3 mg/dl
- 11. Woman of childbearing potential who is known to be pregnant or lactating or who has a positive pregnancy test on admission.
- 12. Subject participating in a study involving an investigational drug or device that would impact this study.
- 13. Cerebral vasculitis
- 14. Patients with a pre-existing neurological or psychiatric disease that would confound the neurological or functional evaluations, mRS score at baseline must be ≤ 1. This excludes patients who are severely demented, require constant assistance in a nursing home type setting or who live at home but are not fully independent in activities of daily living (toileting, dressing, eating, cooking and preparing meals, etc.)
- 15. Unlikely to be available for 90-day follow-up (e.g. no fixed home address, visitor from overseas).
- 16. Hypodensity on CT or restricted diffusion amounting to an ASPECTS score of <7 on NCCT or <6 on DWI MRI. Patients 81 to 85 years old with ASPECTS score on non-contrast CT or DWI MRI <9 must be excluded. ASPECTS must be evaluated by CBV maps of CT Perfusion, CTA source imaging (CTA-SI) or DWI-MR in patients whose vascular occlusion study (CTA/MRA) confirming qualifying occlusion, is performed beyond 4.5 hours of last seen well.
- 17. CT or MR evidence of hemorrhage (the presence of microbleeds is allowed).
- 18. Significant mass effect with midline shift.
- 19. Evidence of ipsilateral carotid occlusion, high grade stenosis or arterial dissection in the extracranial or petrous segment of the internal carotid artery that cannot be treated or will prevent access to the intracranial clot or excessive tortuosity of cervical vessels precluding device delivery/deployment
- 20. Subjects with occlusions in multiple vascular territories (e.g., bilateral anterior circulation, or anterior/posterior circulation)
- 21. Evidence of intracranial tumor (except small meningioma).