• J S Floyd, K L Wiggins, C M Sitlani, J H Flory, S Dublin, N L Smith, S R Heckbert, and B M Psaty.
• Cardiovascular Health Research Unit, University of Washington, Seattle, WA, USA.
• Diabetes Obes Metab. 2015 Dec 1; 17 (12): 1194-7.

AbstractWe conducted a population-based case-control study to assess the myocardial infarction (MI) and stroke risks associated with sulphonylureas and insulin when used in combination with metformin. Cases had type 2 diabetes and used metformin + insulin or metformin + sulphonylureas at the time of a first MI or first stroke between 1995 and 2010; controls used the same treatment combinations and were randomly sampled from the same population. MI and stroke diagnoses and potential confounders were validated by medical record reviews. Compared with metformin + sulphonylurea, metformin + insulin was associated with similar risks of MI or stroke [odds ratio 0.98 (95% confidence interval 0.63-1.52)]. Meta-analysis with another observational study improved the precision of the risk estimate [relative risk 0.92 (95% confidence interval 0.69-1.24)]. Current evidence suggests that there may not be large differences in cardiovascular risk associated with the use of insulin or sulphonylureas when used in combination with metformin. © 2015 John Wiley & Sons Ltd.

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