Metoprolol compared to carvedilol deteriorates insulin-stimulated endothelial function in patients with type 2 diabetes - a randomized study.

Britt Kveiborg, Thomas S Hermann, Atheline Major-Pedersen, Buris Christiansen, Christian Rask-Madsen, Jakob Raunsø, Lars Køber, Christian Torp-Pedersen, Helena Dominguez

Journal: Cardiovascular diabetology 2010;9():21

PMID: 20500877

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Abstract

AIM

Studies of beta blockade in patients with type 2 diabetes have shown inferiority of metoprolol treatment compared to carvedilol on indices of insulin resistance. The aim of this study was to examine the effect of metoprolol versus carvedilol on endothelial function and insulin-stimulated endothelial function in patients with type 2 diabetes.

METHOD

24 patients with type 2 diabetes were randomized to receive either 200 mg metoprolol succinate or 50 mg carvedilol daily. Endothelium-dependent vasodilation was assessed by using venous occlusion plethysmography with increasing doses of intra-arterial infusions of the agonist serotonin. Insulin-stimulated endothelial function was assessed after co-infusion of insulin for sixty minutes. Vaso-reactivity studies were done before and after the two-month treatment period.

RESULTS

Insulin-stimulated endothelial function was deteriorated after treatment with metoprolol, the percentage change in forearm blood-flow was 60.19% +/- 17.89 (at the highest serotonin dosages) before treatment and -33.80% +/- 23.38 after treatment (p = 0.007). Treatment with carvedilol did not change insulin-stimulated endothelial function. Endothelium-dependent vasodilation without insulin was not changed in either of the two treatment groups.

CONCLUSION

This study shows that vascular insulin sensitivity was preserved during treatment with carvedilol while blunted during treatment with metoprolol in patients with type 2 diabetes.

TRIAL REGISTRATION

Current Controlled Trials NCT00497003.

Address: Department of Medicine, Naestved Hospital, Naestved, Denmark. [email protected]

DOI: 10.1186/1475-2840-9-21

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MeSH Terms: Adrenergic beta-Antagonists, Carbazoles, Carvedilol, Denmark, Diabetes Mellitus, Type 2, Dose-Response Relationship, Drug, Endothelium, Vascular, Female, Forearm, Humans, Hypoglycemic Agents, Infusions, Intra-Arterial, Insulin, Insulin Resistance, Male, Metoprolol, Middle Aged, Nitroprusside, Photoplethysmography, Propanolamines, Regional Blood Flow, Serotonin, Time Factors, Treatment Outcome, Vasodilation, Vasodilator Agents