Intra-Arterial Tirofiban After Complete Recanalization for Acute Intracranial Large-Vessel Occlusion

Inclusion Criteria: Age ≥18 years; Last known well to arterial puncture within 0 to 24 hours; Preoperative imaging confirms anterior circulation large-vessel occlusion, including intracranial internal carotid artery occlusion or middle cerebral artery M1 or dominant M2 occlusion; Baseline National Institutes of Health Stroke Scale (NIHSS) score 6 to 25; Baseline Alberta Stroke Program Early CT Score (ASPECTS) ≥6 on CT or DWI; Pre-stroke modified Rankin Scale (mRS) score ≤1; eTICI 2c to 3 complete recanalization achieved after mechanical thrombectomy, or spontaneous recanalization to eTICI 2c to 3 confirmed intraoperatively without further thrombectomy; Embolic occlusion with no residual fixed stenosis in the target vessel after thrombectomy; Written informed consent provided by the participant or legally authorized representative. Exclusion Criteria: Pregnancy or breastfeeding; Active bleeding within the previous month or known severe bleeding tendency; Major underlying disease with life expectancy \<6 months, or inability in the investigator's judgment to complete follow-up; Participation in another interventional clinical trial; Use of oral anticoagulants within 48 hours before symptom onset with INR \>1.7, or recent use of direct oral anticoagulants not meeting institutional cessation or testing requirements; Platelet count \<50 × 10\^9/L; Blood glucose \<2.8 mmol/L or \>22.2 mmol/L that cannot be corrected promptly Severe renal insufficiency, defined as eGFR \<30 mL/min/1.73 m² or serum creatinine \>2.5 mg/dL; Uncontrolled blood pressure, defined as systolic blood pressure \>185 mmHg or diastolic blood pressure \>110 mmHg despite treatment; Imaging evidence of intracranial hemorrhage, or presence of an intracranial aneurysm, arteriovenous malformation, brain tumor, or other lesion associated with high bleeding risk; Bilateral acute cerebral infarction or multiple intracranial arterial occlusions Intraoperative vessel rupture, dissection, contrast extravasation, or other severe complications requiring a change in the standard anticoagulation strategy; Need for balloon angioplasty, permanent stent placement, or planned initiation of antiplatelet or anticoagulation therapy within 24 hours after the procedure; More than 3 thrombectomy passes or puncture-to-recanalization time \>90 minutes; Use of an intraoperative intravenous heparin bolus, excluding heparinized saline flush; Suspected embolic stroke due to infection or infectious endocarditis; Severe allergy to contrast agents or tirofiban.