Initiation of insulin therapy in elderly patients taking oral antidiabetes drugs

Pérez, Norma; Moisan, Jocelyne; Sirois, Caroline; Poirier, Paul; Grégoire, Jean-Pierre
June 2009
CMAJ: Canadian Medical Association Journal;6/23/2009, Vol. 180 Issue 13, p1310
Academic Journal
Background: We sought to estimate the rate of initiation of insulin therapy among elderly patients using oral antidiabetes drugs and to identify the factors associated with this initiation. Methods: We conducted a population-based cohort study involving people aged 66 or more years who were newly dispensed an oral antidiabetes drug. Individuals who had received acarbose or a thiazolidinedione were excluded. The rate of insulin initiation was calculated by use of the Kaplan-Meier method. Factors associated with insulin initiation were identified by multivariable Cox regression analyses. Results: In this cohort of 69 674 new users of oral antidiabetes drugs, insulin was initiated at rate of 9.7 cases per 1000 patient-years. Patients who had initially received an insulin secretagogue (rather than metformin), who were prescribed an oral antidiabetes drug by an endocrinologist or an internist, who received higher initial doses of an oral antidiabetes drug, who received oral corticosteroids, used glucometer strips, or were admitted to hospital in the year before initiation of oral antidiabetes therapy, or who received 16 or more medications were more likely than those without these characteristics to have insulin therapy initiated. In contrast, patients who received thiazides or who used up to 12 medications (v. none) were less likely to have insulin therapy initiated. Interpretation: Several factors related to drugs and health services are associated with the initiation of insulin therapy in elderly patients receiving oral antidiabetes drugs. It is unclear whether these factors predict secondary failure of oral antidiabetes drugs or instead reflect better management of type 2 diabetes.


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