Metformin Reduces Cardiac Risks In Diabetic Patients with Kidney Disease

Since long there has been a doubt over which drugs are best for patients with Type 2 diabetes and one of its common complications, kidney disease. New study sheds a light on this information.

Metformin, the recommended first-line drug used for type diabetes, reduces cardiovascular events in diabetic patients with renal complications, according to an observational study which used medical record information from around 50,000 U.S. military veterans. The study done by researchers at Vanderbilt University Medical Center appears in JAMA, the flagship journal of the American Medical Association.

Among the 30 million U.S. adults with Type 2 diabetes, 20% have impaired kidney function. Metformin is associated with 20 percent decreased risk of major adverse cardiovascular events when compared to a class of common diabetes drugs called sulfonylureas.

‘Metformin decreases the risk of major adverse cardiovascular events like heart attack, stroke more compared to sulphonylureas in diabetic patients with kidney disorders.’
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The lower risk associated with metformin translates as 5.8 fewer of these events per 1,000 person-years compared to sulfonylureas. The events tracked in the study include heart attack, stroke, transient ischemic attack and cardiovascular death.

"Until recently the use of metformin in patients with diabetes and impaired kidney function was cautioned against due to safety concerns. The effectiveness of metformin demonstrated in this study will further support a potential change in prescribing practices for these patients. We believe these results should encourage providers to continue use of metformin in mild-to- moderate kidney disease," said a leader of the study, Christianne Roumie, MD, MPH, associate professor of Medicine and Pediatrics at VUMC.

Among patients receiving care from 2001 through 2016 within the national Veterans Health Administration, 174,882 were newly diagnosed with Type 2 diabetes, started using either metformin or a sulfonylurea, and developed impaired kidney function.

The new study is focused on 24,679 patients who continued on metformin and 24,799 who continued on a sulfonylurea (the study excluded patients who added other diabetes medications on top of these drugs).

To account for other factors that might influence cardiovascular risk, Roumie and colleagues evaluated patient characteristics like age, sex, race, other illnesses, body mass index and blood pressure.

Median follow-up was 1.0 years for patients taking metformin, 1.2 years for sulfonylurea users. Metformin users experienced 1,048 adverse events while sulfonylurea users experienced 1,394, or 23.0 and 29.2 per 1,000 person-years, respectively. After adjustment for other risk variables, this amounted to a 20% reduced risk with metformin compared to a sulfonylurea.

Source-Eurekalert