Efficacy and safety of delayed thrombolysis for ischemic stroke within 4.5-24h: A systematic review and meta-analysis of randomized controlled trials
Publicado em: 2025
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Resumo
The efficacy and safety of thrombolytics within the first 4.5h of ischemic stroke symptom onset are well documented; however, evidence beyond this timeframe remains contentious. To assess the efficacy and safety of delayed thrombolysis (4.5-24-h window) for ischemic stroke. We conducted a systematic search to identify studies comparing thrombolytics to placebo or standard care in ischemic stroke patients treated within 4.5-24h of symptom onset. The primary outcome was functional independence at 90 days, with additional efficacy outcomes exploring recanalization and reperfusion at 24h, as well as safety outcomes of 90-day mortality and symptomatic intracranial hemorrhage. The statistical analysis was performed using R studio. We included five randomized controlled trials with 1398 patients. The mean age was 70.2 years, 61% were male, and the median NIHSS score was 10.2. Compared with controls, thrombolysis improved functional independence at 90 days (OR 1.32; 95% CI: 1.06-1.63; p=0.01; I=0%), although it increased the risk of symptomatic intracranial hemorrhage (OR 2.5; 95% CI: 1.10-5.71; p=0.02; I=0%). No significant difference in mortality at 90 days was observed (OR 1.15; 95% CI: 0.84-1.57; p=0.39; I=0%). In ischemic stroke, thrombolytics administered within 4.5-24h improve functional independence at 90 days, also increasing the risk of symptomatic intracranial hemorrhage. At this point, careful and individualized patient selection, including advanced imaging, is mandatory for thrombolysis beyond the conventional 4.5-h treatment window.