Effect of Adding Vildagliptin to Metformin on Antioxidant State, Inflammatory, and Atherothrombotic Markers in Newly Diagnosed Patients with Type 2 Diabetes Mellitus

Objective: This study aimed to evaluate the effect of adding vildagliptin to metformin therapy on major CV risk parameters in newly diagnosed patients with type 2 diabetes mellitus (T2DM). Methods: Forty three eligible patients were prospectively randomized to receive combined vildagliptin/ metformin therapy or metformin alone. Anthropometric measurements, blood pressure (BP), glycated hemoglobin (HbA1c), lipid profile, plasminogen activator inhibitor-1 (PAI-1), high sensitivity C-reactive protein (hs- CRP), and total antioxidant capacity (TAC) were assessed at baseline and after 12 weeks. Results: Forty patients completed the study (20 in each group). At baseline, no significant differences were observed between groups in all studied parameters. After 12 weeks, combined vildagliptin/metformin showed significant reductions in HbA1c (Δ change: -2.68 ± 2.24 versus -1.37 ± 1.8%, P=0.043, respectively), systolic BP (Δ change: -12.5 ± 13.03 versus -3.75 ± 11.57 mmHg, p=0.012, respectively), diastolic BP (Δ change: -10.25 ± 9.39 versus -2.5 ± 9.39 mmHg, p=0.009, respectively), triglycerides (Δ change: -9.7 ± 18.48 versus 10.35 ± 27.36 mg/dl, p=0.037, respectively), and PAI-1(Δ change: -7.93 ± 17.11 versus 3.9 ± 19.39 ng/ml, p=0.048, respectively) as compared to metformin monotherapy. No significant differences were observed between both groups regarding their effects on other studied parameters. Conclusion: Adding vildagliptin to metformin resulted in a decrease in PAI-1, systolic and diastolic BP, triglycerides, and HbA1c with no significant changes in hs-CRP, TAC, and other lipid markers.