Journal
DIABETES CARE
Volume 28, Issue 5, Pages 995-1000Publisher
AMER DIABETES ASSOC
DOI: 10.2337/diacare.28.5.995
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OBJECTIVE - To describe the course and predictors of glycemic Control among patients 14 With type 2 diabetes after sulfonylureas (SUs) are added to metformin (MF). RESEARCH DESIGN AND METHODS - Patients (n = 2,220) treated With MF monotherapy for > 90 days before initiating MF plus SU combination therapy between January 1998 and March 2004 were Studied in a retrospective analysis Of electronic medical records from U.K. primary care practices using the General Practice Research Database. Median glycoslyated hemoglobin, A(1c)(AIC) before and after SU initiation was described,and patient characteristics were evaluated as predictors Of time until A1C >= 8.0% glucose-lowering therapy was intensified (by starting insulin or adding a third oral -,agent). RESULTS - At months post-SU initiation, median A1C resumed deteriorating at a some what comparable rate to that observed on MF monotherapy. Higher pre-SUA1C, younger age, female sex, shorter diabetes duration, higher serum creatinine, and being an ex-smoker predicted time until A1C >= 8.0% or glucose-lowering therapy was intensified in various analyses. Median A1C was 9.5% when therapy was unensifred. A1C >= 8.0%,was estimated to occur in 85% of patients 4 yearsafter SU initiation and in 68% 4 years after initially achieving, A1C < 7% on MF Plus SU therapy. CONCLUSIONS - In this population, glycentic control is improved following the addition of SUs to MF, but deterioration resumes is carly as 6 months.The high proportion of patients remaining on MF plus SU therapy despite having A1C >= 8.0% suggests that there are significant barriers to starting insulin or adding a third agent when treatment goals are not achieved with this combination.
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