Diabetic kidney disease and risk of incident stroke among adults with type 2 diabetes.

ABSTRACT

BACKGROUND: Data on the relations between kidney function abnormalities and stroke in type 2 diabetes are limited. We evaluated the associations of kidney function abnormalities and chronic kidney disease (CKD) stages with incident stroke in a large sample of adults with type 2 diabetes. METHODS: Participants with type 2 diabetes from the Action to Control Cardiovascular Risk in Diabetes (ACCORD) study without history of stroke at baseline were included. Urine albumin-to-creatinine ratio (UACR) and estimated glomerular filtration rate (eGFR) were assessed at baseline. CKD categories were defined according to the KDIGO (Kidney Disease Improving Global Outcomes) guidelines. Cox proportional hazards regression models were used to compute hazard ratios (HR) and 95% confidence intervals (CI) for stroke in relation to measures of kidney function and CKD categories. RESULTS: A total of 9170 participants (mean age 62.8 [SD 6.6] years, 38.2% women, 62.9% white) were included. Over a median follow-up of 4.9 years (interquartile range 4.0-5.7), 156 participants developed a stroke (incidence rate 3.6/1000 person-years [95% CI 3.0-4.2]). After adjusting for relevant confounders, higher UACR and lower eGFR were each associated with increased risk of stroke. Compared to UACR < 30 mg/g, moderate albuminuria and severe albuminuria were associated with increasing hazards for stroke (HR 1.61 [95% CI 1.12-2.32] and 2.29 [95% CI 1.39-3.80], respectively). Compared to eGFR of ≥ 60 mL/min/1.73 m2, decreased eGFR (eGFR < 60 mL/min/1.73 m2) was associated with higher risk of stroke (HR 1.50, 95% CI 0.98-2.29). Compared to no CKD, worsening CKD stage was associated with an increasing risk of stroke (HRs of 1.76 [95% CI 1.10-2.83] for CKD G1, 1.77 [95% CI 1.13-2.75] for CKD G2, and 2.03 [95% CI 1.27-3.24] for CKD G3). CONCLUSIONS: In a large sample of adults with type 2 diabetes, increasing albuminuria and worsening stages of early CKD were independently associated with higher risk of incident stroke. TRIAL REGISTRATION ClinicalTrials.gov. Identifier NCT00000620 .