Economic effects of prolonged clopidogrel therapy after percutaneous coronary intervention.
OBJECTIVE
This study examined the incremental cost-effectiveness of extending clopidogrel therapy from one month to one year after percutaneous coronary intervention (PCI) in an unselected, heterogeneous patient population.


BACKGROUND
Clinical trials suggest that prolonging clopidogrel therapy for up to one year after PCI reduces downstream cardiac events. However, clopidogrel therapy is costly and may increase bleeding risk.


METHODS
Using decision analysis, we compared the outcomes and cost of prolonging clopidogrel treatment from one month to one year after PCI with the alternative strategy of discontinuing therapy one month after the procedure. Event rates were based on 3,976 PCI patients who were treated between January 1999 and December 2001 at the Duke Medical Center and received no more than one month of clopidogrel after the procedure. Baseline characteristics and event rates were obtained from Duke clinical information systems. The effect of prolonged clopidogrel therapy on event rates was based on the Clopidogrel for the Reduction of Events During Observation (CREDO) trial per-protocol data. Unit costs and the effect of myocardial infarction (MI) on life expectancy were based on published sources.


RESULTS
Extending clopidogrel therapy from one month to one year after PCI cost USD 879 per patient and reduced the risk of MI by 2.6%. Assuming MI decreases life expectancy by two years, prolonged therapy would cost USD 15,696 per year of life saved. Economic attractiveness of therapy varied with baseline risk, the effect of prolonged therapy on MI risk, and the price of clopidogrel.


CONCLUSIONS
Prolonging clopidogrel therapy for one year after PCI is economically attractive, particularly in high-risk patients.
Cowper
Patricia A
PA
Outcomes Research and Assessment Group, Duke Clinical Research Institute, Duke University Medical Center, Durham, NC, USA. cowpe001@mc.duke.edu
Udayakumar
Krishna
K
Sketch
Michael H
MH
Peterson
Eric D
ED
D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D000077144:Clopidogrel; D003362:Cost-Benefit Analysis; D003661:Decision Support Techniques; D004334:Drug Administration Schedule; D005260:Female; D005500:Follow-Up Studies; D017048:Health Care Costs; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000191:economics / Q000517:prevention & control*; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage* / Q000191:economics*; D012189:Retrospective Studies; D013988:Ticlopidine / Q000008:administration & dosage* / Q000031:analogs & derivatives* / Q000191:economics*; D013997:Time Factors; D016896:Treatment Outcome
D010975:Platelet Aggregation Inhibitors; D000077144:Clopidogrel; D013988:Ticlopidine