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  • Title: Early glycaemic control in metformin users receiving their first add-on therapy: a population-based study of 4,734 people with type 2 diabetes.
    Author: Thomsen RW, Baggesen LM, Søgaard M, Pedersen L, Nørrelund H, Buhl ES, Haase CL, Johnsen SP.
    Journal: Diabetologia; 2015 Oct; 58(10):2247-53. PubMed ID: 26277380.
    Abstract:
    AIMS/HYPOTHESIS: The aims of this work were to assess glycaemic control in metformin users receiving their first add-on glucose-lowering therapy and to examine the real-life effectiveness of different add-on drugs. METHODS: We carried out a population-based cohort study using healthcare databases in northern Denmark during 2000-2012. We included 4,734 persons who initiated metformin monotherapy and added another glucose-lowering drug within 3 years. Attainment of recommended HbA1c goals within 6 months of add-on was investigated, using Poisson regression analysis adjusted for age, sex, baseline HbA(1c), diabetes duration, complications and Charlson Comorbidity Index. RESULTS: Median metformin treatment duration at intensification was 12 months (interquartile range [IQR] 4-23 months) and pre-intensification HbA(1c) was 8.0% (IQR 7.2-9.2%) (64 [IQR 55-77] mmol/mol). Median HbA(1c) dropped 1.2% (13 mmol/mol) with a sulfonylurea (SU) add-on, 0.8% (9 mmol/mol) with a dipeptidyl peptidase-4 (DPP-4) inhibitor, 1.3% (14 mmol/mol) with a glucagon-like peptide-1 (GLP-1) receptor agonist, 0.9% (10 mmol/mol) with other non-insulin drugs and 2.4% (26 mmol/mol) with insulin. Compared with SU add-on, attainment of HbA(1c) <7% (<53 mmol/mol) was higher with GLP-1 receptor agonists (adjusted RR [aRR] 1.10; 95% CI 1.01, 1.19) and lower with DPP-4 inhibitors (aRR 0.94; 95% CI 0.89, 0.99), other drugs (aRR 0.86; 95% CI 0.77, 0.96) and insulin (aRR 0.88; 95% CI 0.77, 0.99). The proportion of metformin add-on users who attained HbA(1c) <7% (<53 mmol/mol) increased from 46% in 2000-2003 to 59% in 2010-2012, whereas attainment of HbA(1c) <6.5% (<48 mmol/mol) remained 30% among patients aged <65 years without comorbidities. CONCLUSIONS/INTERPRETATION: Among early type 2 diabetes patients receiving their first metformin add-on treatment, HbA(1c) reduction with different non-insulin drugs is similar to, and comparable with, that observed in randomised trials, yet 41% do not achieve HbA(1c) <7% (<53 mmol/mol) within 6 months.
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