Key result
Early thrombolysis within 3 hours maximizes recovery via rapid recanalization, shifting to tissue-dependent viability after 4.5 hours.
Why the study?
While minimizing time to recanalization in acute ischemic stroke is critical in the first 2 to 3 hours, recovery after 4.5 hours depends more on physiologic tissue issues and clot characteristics than on occlusion duration alone.
While thrombolysis in the first 2-3 hours of acute ischemic stroke is strictly time-dependent, patient selection for delayed reperfusion beyond 4.5 hours should rely on clinical factors and imaging to assess physiological tissue viability.
Answers are grounded in this paper and cite their sources.
Reinforces early thrombolysis within 3 hours; leaves open validation of physiologic selection beyond 4.5 hours.
It is indisputable that in the first 2 to 3 hours of an acute ischemic, the best strategy to maximize recovery is robustly time-based and depends on getting the artery open as soon as possible. The second law of thermodynamics and the underappreciated effect of clot consistency and size must be accounted for in our efforts to minimize time to recanalization within the first 2 to 3 hours. It is also clear that at later time intervals, beyond 4.5 hours, few patients completely recover even with sustained complete recanalization, and that the ability to recover depends more on physiologic tissue issues than on the duration of the occlusion. Clinical factors as well as imaging should be used to select patients who may benefit from delayed attempts at reperfusion.
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James C. Grotta (2012) conducted a review in Acute ischemic stroke. Thrombolysis / reperfusion was evaluated on Complete recovery and recanalization. Thrombolysis within 2 to 3 hours maximizes recovery via rapid recanalization, whereas beyond 4.5 hours recovery depends more on physiologic tissue factors than occlusion duration.
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