Since 2015, many randomized trials have shown that endovascular thrombectomy improve functional outcomes in acute ischemic stroke patients with large vessel occlusion. Recently, five randomized controlled trials (ANGEL-ASPECT [Endovascular Therapy in Acute Anterior Circulation Large Vessel Occlusive Patients with a Large Infarct Core], LASTE [LArge Stroke Therapy Evaluation], RESCUE-Japan LIMIT [The Recovery by Endovascular Salvage for Cerebral Ultra-Acute Embolism-Japan Large Ischemic Core Trial], SELECT 2 [Randomized Controlled Trial to Optimize Patient's Selection for Endovascular Treatment in Acute Ischemic Stroke], and TENSION [The Efficacy and Safety of Thrombectomy in Stroke with extended lesion and extended time window]) demonstrated the efficacy and safety of thrombectomy for large infarct patients (defined as Alberta Stroke Program Early Computed Tomography Score [ASPECTS] ≥3 or infarct core <100ml). Patients with extra-large infarct core (ASPECTS score of 2 or less) were excluded from these trials. Therefore, the efficacy of endovascular thrombectomy in patients with extra-large ischemic burden has not been well studied. The XL STROKE registry is aiming to investigate the clinical outcomes and safety of mechanical thrombectomy in acute extra-large ischemic stroke.

Inclusion Criteria:

Clinical inclusion criteria

1. Age ≥18 years;
2. Presenting with acute ischemic stroke within 24 hours of time from last known well;
3. The patient or patient's representative signs a written informed consent form before enrollment.

Neuroimaging inclusion criteria

1. Occlusion of internal carotid artery, or the middle cerebral artery M1 or M2 segments confirmed by computed tomography angiography, magnetic resonance angiography, or digital subtraction angiography;
2. The baseline ASPECTS is 0 to 2 based on NCCT or diffusion weighted imaging, or cerebral extra-large ischemic core volume ≥85ml (defined as relative cerebral blood flow <30% on CT perfusion or an apparent diffusion coefficient <620×10^-6 mm2/s on MRI).

Exclusion criteria

1. CT or MRI evidence of acute intracranial hemorrhage;
2. Evidence of mass effect with ventricular effacement, midline shift or herniation on baseline imaging;
3. Females who are pregnant, or those of childbearing, potential with positive urine or serum beta Human Chorionic Gonadotropin test;
4. Previous bleeding disorders, severe heart, liver or kidney disease, or sepsis;
5. Any terminal illness with life expectancy less than 6 months;
6. Participation in other clinical treatment trials.

All patients are presented with acute extra-large stroke and large vessel occlusion within 24 hours of time from last known well.

Study Protocol, Clinical Study Report, and Analytic Code will be shared after approval of a proposal from principal investigator 3 years after the trial results are revealed.

3 years after the trial results are revealed

After approval of a proposal from principal investigator