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  • Title: The risk of coronary heart disease in type 2 diabetic patients exposed to thiazolidinediones compared to metformin and sulfonylurea therapy.
    Author: Johannes CB, Koro CE, Quinn SG, Cutone JA, Seeger JD.
    Journal: Pharmacoepidemiol Drug Saf; 2007 May; 16(5):504-12. PubMed ID: 17245800.
    Abstract:
    PURPOSE: To evaluate whether the risk of coronary heart disease (CHD) differs among adult diabetic patients treated with thiazolidinediones (TZDs) and similar patients treated with combined oral metformin and sulfonylurea (M + S) therapy. METHODS: We conducted a retrospective cohort study involving 25 140 diabetic patients aged 18 and older who had at least one pharmacy claim for a TZD or combined M + S therapy between 1 January 1999 and 30 June 2002. We used propensity score matching to adjust for observable differences between initiators of combined M + S therapy and TZD initiators. The data were analyzed in two ways: first based on the original matched groups, 'as balanced', without accounting for switching to another medication during follow-up, and second based on actual antidiabetic drug use during follow-up, 'as treated'. Cox proportional hazards regression and multivariable Poisson regression were performed to compare the risk of CHD events. RESULTS: In the 'as balanced' analysis, the risk for CHD among TZD users relative to combination drug users was close to the null value (adjusted hazard ratio: 1.02, 95% confidence intervals (CI): 0.87-1.20). In the 'as treated' analysis, the risk of CHD was similar for periods of current use of TZDs compared to periods of non-use (incidence rate ratio: 1.10, 95%CI: 0.96-1.25). CONCLUSIONS: These results do not suggest a cardioprotective or deleterious effects of TZDs compared with combined M + S oral therapy on the short-term CHD event risk in persons with type 2 diabetes after accounting for the greater baseline CHD risk in TZD initiators.
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