tPA use for Stroke in the Registry of the Canadian Stroke Network

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Abstract
Background: Thrombolytic therapy with recombinant tissue plasminogen activator (tPA) has been shown to be cost-effective and safe. Thrombolysis for stroke with tPA is now a standard of care in North America. However, it is only used on a small percentage of patients.Methods: The Registry of the Canadian Stroke Network was a consent-based stroke registry from 21 hospital sites across Canada. Using the thrombolysis data in phase 1 and 2 of the Registry, we sought to describe the use of stroke thrombolysis and its outcomes.Results: A total of 4107 patients were diagnosed with ischemic stroke in phase 1 and 2 of the Registry, of which 8.9% were treated with tPA. In consented tPA patients, the method of tPA administration was 85.8% IV only, 9.0% IA only, and 5.2% IV/IA combined. Patients had a median onset-to-treatment time of 167 minutes [IQR 140-188]. One quarter (25.5%) of eligible candidates (time from onset <150 minutes) were treated with tPA. Protocol violations occurred in 27.7% (67/242) of patients with 14.9% (10/67) mortality. Overall, in-hospital mortality was 11.6%. Lower Canadian Neurological Scale score and higher glucose level were predictive of mortality The symptomatic intracerebral hemorrhage (ICH) rate (phase 2 only) was 4.3%. The mean Stroke Impact Scale-16 score at six months was 73.2, approximately equivalent to a modified Rankin scale score of 2.Conclusions: At selected hospitals in Canada, thrombolysis use is higher than previously reported rates. Thrombolysis continues to be safe and effective in Canada.