Unknown Time of Onset Stroke RePerfusIon Without Advanced Imaging

Inclusion Criteria: 1. Age ≥ 18 years old. 2. Clinical diagnosis of acute ischemic stroke. 3. Unknown time of stroke onset (e.g., stroke symptom recognized on awakening) but last-known normal time \>4.5 hours. 4. Time from stroke symptom recognition (e.g., awakening) to randomization within 3 hours. 5. National Institutes of Health Stroke Scale (NIHSS) score of 6-25 (both inclusive). 6. Pre-stroke modified Rankin Scale (mRS) score of 0-1. 7. Written informed consent from patients or their legally authorized representatives. Exclusion Criteria: 1. Intracranial hemorrhage confirmed by skull CT, or history of intracranial hemorrhage. 2. Planned endovascular treatment. 3. Rapid neurological improvement with NIHSS \<6 at randomization. 4. Allergy to tenecteplase. 5. Use of vitamin K antagonist with INR \>1.7, use of heparin or low molecular heparin in the past 24 hours, or use of direct oral anticoagulants in the past 48 hours. 6. Hypodensity on non-contrast CT \>1/3 middle cerebral artery territory. 7. Severe traumatic brain injury or other major trauma in the past 3 months. 8. Intracranial neoplasm, arteriovenous malformation, or aneurysm (≥10mm). 9. Intracranial surgery, intraspinal surgery, or other major surgery in the past 3 months. 10. Gastrointestinal or urinary tract hemorrhage in the past 3 weeks. 11. Active internal bleeding. 12. Aortic dissection. 13. Infective endocarditis. 14. Platelet count \<100×10\^9/L. 15. Women who are pregnant or breastfeeding. 16. Blood glucose \<50 or \>400 mg/dL (\<2.78 or \>22.2 mmol/L). 17. Systolic blood presure \>185 mmHg or diastolic blood presure \>110 mmHg refractory to treatment. 18. Life expectancy \<3 months. 19. Participating in other trials. 20. Any condition that, in the judgment of the investigator, makes the patient unsuitable for this study or where this study may impose a significant risk to the patient (e.g., inability to understand and/or comply with study procedures and/or follow-up due to psychiatric disorders, cognitive or emotional impairment).