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  • Title: Addition of rosiglitazone to metformin is most effective in obese, insulin-resistant patients with type 2 diabetes.
    Author: Jones TA, Sautter M, Van Gaal LF, Jones NP.
    Journal: Diabetes Obes Metab; 2003 May; 5(3):163-70. PubMed ID: 12681023.
    Abstract:
    AIM: These analyses were undertaken to evaluate the efficacy of the insulin sensitizer rosiglitazone (RSG) when added to the therapy of obese type 2 diabetes mellitus patients (T2DM) taking near-maximal doses (2.5 g/day) of metformin (MET). In obese, insulin-resistant patients with T2DM who are inadequately controlled on MET, the addition of an agent that reduces insulin resistance may be a more rational and innovative approach than the addition of an insulin secretagogue. METHODS: Data were pooled from two double-blind studies of RSG added to 2.5 g/day MET, involving a total of 550 T2DM patients. Patients were categorized as non-overweight, overweight and obese according to their baseline BMI using WHO criteria (<25 kgm(-2), 25-30 kgm(-2), >30 kgm(-2) respectively). RESULTS: RSG improved glycaemia (HbA1c) and fasting plasma glucose (FPG) to a clinically significant extent in all three subgroups but the effect was most pronounced in the obese patients. Improvements in HOMA estimates of insulin resistance and beta-cell function were also greatest in the obese patients (4 mg: -16% and +19%; 8 mg: -37% and + 33% respectively), as were reductions in fasting insulin. The profile of adverse events was not demonstrably different in obese patients from the non-obese. CONCLUSIONS: In obese type 2 diabetic patients inadequately controlled on MET alone, addition of rosiglitazone improves glycaemic control, insulin sensitivity and beta-cell function to a clinically important extent.
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