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Cost-Utility Analysis of Tissue Plasminogen Activator Therapy for Acute Ischaemic Stroke

A Canadian Healthcare Perspective

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Abstract

Background: There are over 40 000 ischaemic strokes annually in Canada, which result in significant morbidity, mortality and burden to the healthcare system. A recent, large clinical trial has evaluated tissue plasminogen activator (t-PA) intravenously for the treatment of acute ischaemic stroke with promising outcomes but with an increased risk of symptomatic intracranial haemorrhage.

Objective: To compare clinical and economic outcomes of intravenous t-PA therapy (0.9 mg/kg, to a maximum of 90mg, initiated within 3 hours of stroke onset) versus no t-PA for acute ischaemic stroke based on the outcomes achieved in the National Institute of Neurological Disorders and Stroke (NINDS) trial.

Design: A Markov model depicting the natural lifetime course after an initial acute ischaemic stroke. On the basis of this model, a simulated trial compared no t-PA with t-PA.

Patients: A hypothetical cohort of 1000 patients with acute ischaemic stroke.

Study perspective: Canadian healthcare system.

Outcome measures: Total acute stroke and post-stroke treatment costs and cumulative quality-adjusted life-years (QALYs).

Results: For a hypothetical cohort of 1000 patients, the estimated lifetime stroke costs were 103 100 000 Canadian dollars ($Can) [1999 values) in the t-PA arm ($Can103 100 per patient) compared with $Can106 900 000 in the no t-PA arm ($Can106 900 per patient), yielding a lifetime cost difference of $Can3 800 000 in favour of t-PA versus no t-PA ($Can3800 per patient). In the hypothetical cohort, t-PA treatment resulted in 13 130 QALYs versus 9670 QALYs with no t-PA treatment. This translated into a net benefit of 3460 additional QALYs per 1000 patients (3.46 QALYs per patient). No treatment, outcome or economic variables influenced the model outcome.

Conclusion: From the standpoint of cost effectiveness, treatment of acute ischaemic stroke with intravenous t-PA is an economically attractive strategy.

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Acknowledgements

This study was funded by the B.C. and Yukon Heart and Stroke Foundation. Dr Teal has functioned as a consultant to Hoffman LaRoche and Dr Fagan is on the Speaker’s Bureau and has been a consultant for Genentech, Inc.

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Correspondence to Carlo A. Marra.

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Sinclair, S.E., Frighetto, L., Loewen, P.S. et al. Cost-Utility Analysis of Tissue Plasminogen Activator Therapy for Acute Ischaemic Stroke. Pharmacoeconomics 19, 927–936 (2001). https://doi.org/10.2165/00019053-200119090-00004

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