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A correction has been published: N Engl J Med 1995;333(4):267.

Special Article
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Volume 332:1418-1424 May 25, 1995 Number 21
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Cost Effectiveness of Thrombolytic Therapy with Tissue Plasminogen Activator as Compared with Streptokinase for Acute Myocardial Infarction
Daniel B. Mark, M.D., M.P.H., Mark A. Hlatky, M.D., Robert M. Califf, M.D., C. David Naylor, M.D., D.Phil., Kerry L. Lee, Ph.D., Paul W. Armstrong, M.D., Gabriel Barbash, M.D., Harvey White, M.B., Maarten L. Simoons, M.D., Charlotte L. Nelson, M.S., Nancy Clapp-Channing, M.P.H., J. David Knight, M.S., Frank E. Harrell, Ph.D., John Simes, M.D., and Eric J. Topol, M.D.

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ABSTRACT

Background Patients with acute myocardial infarction who were treated with accelerated tissue plasminogen activator (t-PA) (given over a period of 11/2 hours rather than the conventional 3 hours, and with two thirds of the dose given in the first 30 minutes) had a 30-day mortality that was 15 percent lower than that of patients treated with streptokinase in the Global Utilization of Streptokinase and Tissue Plasminogen Activator for Occluded Coronary Arteries (GUSTO) study. This was equivalent to an absolute decrease of 1 percent in 30-day mortality. We sought to assess whether the use of t-PA, as compared with streptokinase, is cost effective.

Methods Our primary, or base-case, analysis of cost effectiveness used data from the GUSTO study and life expectancy projected on the basis of the records of survivors of myocardial infarction in the Duke Cardiovascular Disease Database. In the primary analysis, we assumed that there were no additional treatment costs due to the use of t-PA after the first year and that the comparative survival benefit of t-PA was still evident one year after enrollment.

Results One year after enrollment, patients who received t-PA had both higher costs ($2,845) and a higher survival rate (an increase of 1.1 percent, or 11 per 1000 patients treated) than streptokinase-treated patients. On the basis of the projected life expectancy of each treatment group, the incremental cost-effectiveness ratio — with both future costs and benefits discounted at 5 percent per year — was $32,678 per year of life saved. The use of t-PA was least cost effective in younger patients and most cost effective in older patients. At all ages, the use of t-PA in patients with anterior infarctions yielded more favorable cost-effectiveness values. In our secondary analyses, the cost-effectiveness values were most sensitive to a lowering of the projected long-term survival benefits of t-PA and to moderate or greater increases in the projected medical costs for patients in the t-PA group after the first year. In contrast, our results were not sensitive to even very unfavorable assumptions about the additional costs associated with the higher rate of disabling stroke that was noted in patients treated with t-PA in the GUSTO study.

Conclusions The cost effectiveness of treatment with accelerated t-PA rather than streptokinase compares favorably with that of other therapies whose added medical benefit for dollars spent is judged by society to be worthwhile.


Source Information

From the Economic and Quality of Life Coordinating Center (D.B.M., C.L.N., N.C.-C., J.D.K.) and the Clinical Trials Coordinating Center (R.M.C., K.L.L.), Division of Cardiology, Department of Medicine, and the Division of Biometry, Department of Community and Family Medicine (K.L.L., F.E.H.), Duke University Medical Center, Durham, N.C.; the Division of Health Services Research, Department of Health Research and Policy, Stanford University School of Medicine, Palo Alto, Calif. (M.A.H.); the Department of Medicine, University of Toronto, and the Institute for Clinical Evaluative Sciences, Toronto (C.D.N.); the Department of Medicine, University of Alberta, Edmonton (P.W.A.); Tel Aviv Sorasky University Medical Center, Tel Aviv, Israel (G.B.); the Cardiology Department, Green Lane Hospital, Auckland, New Zealand (H.W.); Erasmus University, Rotterdam, the Netherlands (M.L.S.); the National Health and Medical Research Council Clinical Trials Centre, University of Sydney, Sydney, Australia (J.S.); and the Department of Cardiology, Cleveland Clinic, Cleveland (E.J.T.).

Address reprint requests to Dr. Mark at P.O. Box 3485, Duke University Medical Center, Durham, NC 27710.

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Related Letters:

Is the Use of t-PA as Compared with Streptokinase Cost Effective?
Rose E. A., Armentano R., Favaloro R. G., Mark D. B.
Extract | Full Text  
N Engl J Med 1995; 333:1009-1010, Oct 12, 1995. Correspondence

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