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.
Background Patients with acute myocardial infarction who weretreated with accelerated tissue plasminogen activator (t-PA)(given over a period of 11/2 hours rather than the conventional3 hours, and with two thirds of the dose given in the first30 minutes) had a 30-day mortality that was 15 percent lowerthan that of patients treated with streptokinase in the GlobalUtilization of Streptokinase and Tissue Plasminogen Activatorfor Occluded Coronary Arteries (GUSTO) study. This was equivalentto an absolute decrease of 1 percent in 30-day mortality. Wesought to assess whether the use of t-PA, as compared with streptokinase,is cost effective.
Methods Our primary, or base-case, analysis of cost effectivenessused data from the GUSTO study and life expectancy projectedon the basis of the records of survivors of myocardial infarctionin the Duke Cardiovascular Disease Database. In the primaryanalysis, we assumed that there were no additional treatmentcosts due to the use of t-PA after the first year and that thecomparative survival benefit of t-PA was still evident one yearafter enrollment.
Results One year after enrollment, patients who received t-PAhad both higher costs ($2,845) and a higher survival rate (anincrease of 1.1 percent, or 11 per 1000 patients treated) thanstreptokinase-treated patients. On the basis of the projectedlife expectancy of each treatment group, the incremental cost-effectivenessratio with both future costs and benefits discountedat 5 percent per year was $32,678 per year of life saved.The use of t-PA was least cost effective in younger patientsand most cost effective in older patients. At all ages, theuse of t-PA in patients with anterior infarctions yielded morefavorable cost-effectiveness values. In our secondary analyses,the cost-effectiveness values were most sensitive to a loweringof the projected long-term survival benefits of t-PA and tomoderate or greater increases in the projected medical costsfor patients in the t-PA group after the first year. In contrast,our results were not sensitive to even very unfavorable assumptionsabout the additional costs associated with the higher rate ofdisabling stroke that was noted in patients treated with t-PAin the GUSTO study.
Conclusions The cost effectiveness of treatment with acceleratedt-PA rather than streptokinase compares favorably with thatof other therapies whose added medical benefit for dollars spentis 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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