Risk of Stroke Increases With Each Year of Having Diabetes

In patients with diabetes for 10 or more years, the risk of stroke triples

THURSDAY, March 1 (HealthDay News) -- The risk of stroke increases with the length of time a patient has diabetes, according to a study published online March 1 in Stroke.

Chirantan Banerjee, M.B.B.S., M.P.H., of Columbia University in New York City, and colleagues analyzed data from 3,298 stroke-free participants (mean age, 69 ± 10 years) in the Northern Manhattan Study who were followed for a median of nine years. Baseline diabetes and age at diagnosis were determined.

The researchers found that, of the total number of patients (52 percent Hispanic, 21 percent white, and 24 percent black), 22 percent had diabetes at baseline and 10 percent developed diabetes during the study period. There were 244 ischemic strokes, and both baseline diabetes (hazard ratio [HR], 2.5) and diabetes considered as a time-dependent covariate (HR, 2.4) were similarly associated with stroke risk. Duration of diabetes was associated with ischemic stroke (adjusted HR, 1.03 per year with diabetes). Compared to participants without diabetes, those with diabetes for zero to five years (adjusted HR, 1.7), five to 10 years (adjusted HR, 1.8), and ≥10 years (adjusted HR, 3.2) were at increased risk for ischemic stroke.

"Duration of diabetes is independently associated with ischemic stroke risk adjusting for risk factors," the authors write.

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