BACKGROUND: Endothelial dysfunction is prevalent in individuals with end-stage renal disease. Whether endothelial dysfunction is present in patients with moderate chronic kidney disease (CKD) is uncertain. STUDY DESIGN: Cross-sectional study. SETTINGS & PARTICIPANTS: Brachial reactivity measurements were obtained during the seventh examination cycle in 2,818 (diameter measurements) and 2,256 (flow measurements) Framingham Heart Study Offspring cohort participants (53% women; mean age, 61 +/- 9 years). PREDICTOR: Estimated glomerular filtration rate less than 60 mL/min/1.73 m(2) derived from creatinine- and cystatin C-based estimating equations; microalbuminuria status. OUTCOME: Brachial reactivity measurements (baseline brachial diameter, flow-mediated dilation, baseline and hyperemic mean flow). MEASUREMENTS: Linear regression models were used to model brachial measures as a function of CKD and microalbuminuria status. RESULTS: Overall, 7.3% (n = 206) of participants had CKD, and of 2,301 with urinary measurements, 10.0% (n = 230) had microalbuminuria. Brachial reactivity measures did not differ significantly by CKD status in either creatinine- or cystatin C-based equations in either age- and sex- or multivariable-adjusted models. In age- and sex-adjusted models, microalbuminuria was associated with decreased hyperemic mean flow (47.2 +/- 1.4 versus 51.4 +/- 0.5 mg/g; P = 0.005), but the association was not significant after multivariable adjustment (P = 0.09). LIMITATIONS: Predominantly white ambulatory cohort; results may not be generalizable to other ethnic groups or individuals with severe CKD. CONCLUSIONS: Endothelial dysfunction was not a major correlate of CKD in our sample.
BACKGROUND:Endothelial dysfunction is prevalent in individuals with end-stage renal disease. Whether endothelial dysfunction is present in patients with moderate chronic kidney disease (CKD) is uncertain. STUDY DESIGN: Cross-sectional study. SETTINGS & PARTICIPANTS: Brachial reactivity measurements were obtained during the seventh examination cycle in 2,818 (diameter measurements) and 2,256 (flow measurements) Framingham Heart Study Offspring cohort participants (53% women; mean age, 61 +/- 9 years). PREDICTOR: Estimated glomerular filtration rate less than 60 mL/min/1.73 m(2) derived from creatinine- and cystatin C-based estimating equations; microalbuminuria status. OUTCOME: Brachial reactivity measurements (baseline brachial diameter, flow-mediated dilation, baseline and hyperemic mean flow). MEASUREMENTS: Linear regression models were used to model brachial measures as a function of CKD and microalbuminuria status. RESULTS: Overall, 7.3% (n = 206) of participants had CKD, and of 2,301 with urinary measurements, 10.0% (n = 230) had microalbuminuria. Brachial reactivity measures did not differ significantly by CKD status in either creatinine- or cystatin C-based equations in either age- and sex- or multivariable-adjusted models. In age- and sex-adjusted models, microalbuminuria was associated with decreased hyperemic mean flow (47.2 +/- 1.4 versus 51.4 +/- 0.5 mg/g; P = 0.005), but the association was not significant after multivariable adjustment (P = 0.09). LIMITATIONS: Predominantly white ambulatory cohort; results may not be generalizable to other ethnic groups or individuals with severe CKD. CONCLUSIONS:Endothelial dysfunction was not a major correlate of CKD in our sample.
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