Outcome in Patients Treated With Endovascular Thrombectomy - optIMAL Blood Pressure Control 2 (OPTIMAL-BP 2)

\<Inclusion Criteria\> 1. Age ≥20 years 2. Acute ischemic stroke patients who underwent intraarterial thrombectomy for large vessel occlusion. (ICA, M1, M2, A1, P1, VA and BA) 3. Patients with successful recanalization after intraarterial thrombectomy (TICI 2b or TICI 3) 4. Patients with sustained systolic blood pressure (SBP) \<150 mm Hg on successive measurements obtained less than 10 minutes apart within 3 hours after reperfusion. 5. Patients with mean SBP \<150 mmHg within 2 hours after successful recanalization (two measurements ≥2 minutes apart). \<Exclusion Criteria\> 1. Age \<20 2. Patients who failed recanalization of the intracranial artery after endovascular thrombectomy (modified TICI ≤ 2a). 3. Patients with systolic blood pressure ≥ 150 mmHg after successful recanalization. 4. Patients unable to receive antihypertensive medication post-thrombectomy or in whom the investigator believes aggressive blood pressure control could have adverse effects, such as increased risk of hemorrhage. 5. Patients who developed symptomatic intracranial hemorrhage before study enrollment, after successful recanalization. 6. Patients with contraindications to Phenylephrine. 7. Patients with contraindications to antihypertensive medications. 8. Patients with pre-stroke functional disability (modified Rankin Scale, mRS ≥3). 9. Patients with heart failure and reduced cardiac output, with an ejection fraction (EF) \<40%. 10. Patients with end-stage renal disease requiring renal replacement therapy, or chronic kidney disease stage 4 with an eGFR \<30 mL/min. 11. Patients currently taking monoamine oxidase (MAO) inhibitors. 12. Patients with persistent bradycardia with a heart rate \<45 bpm. 13. Pregnant patients. 14. Patients with severe medical or surgical comorbidities, including but not limited to: terminal cancer with life expectancy \<6 months, severe cardiac or aortic disease, severe hematologic disorders, advanced chronic heart failure, severe pneumonia, or sepsis. 15. Patients who do not consent to participate in the study. 16. Patients participating in another study that does not allow co-enrollment. 17. Patients whom the investigator deems unsuitable for study participation for any reason.