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We aimed to compare the therapeutic effect of recombinant tissue plasminogen activator (rt-PA) administered at different time windows within the first 6 hours after onset of acute ischemic stroke (AIS). A retrospective analysis was performed of data collected from 194 patients who received rt-PA thrombolysis within 4.5 hours after AIS onset and from 29 patients who received rt-PA thrombolysis between 4.5–6 hours after AIS onset. The National Institutes of Health Stroke Scale (NIHSS) scores were statistically decreased in both groups (P < 0.05) at 24 hours and 7 days after onset. There was no statistical difference in the modified Rankin score or mortality at day 90 after treatment between the two groups (P > 0.05). In conclusion, AIS patients who received rt-PA treatment between 4.5–6 hours after onset were similar in therapeutic efficacy to those who received rt-PA within 4.5 hours after onset. Our results suggest that intravenous thrombolytic therapy for AIS within 4.5–6 hours after onset is effective and safe.

Comparison of Therapeutic Effect of Recombinant Tissue Plasminogen Activator by Treatment Time after Onset of Acute Ischemic Stroke