Chronic kidney disease associated with decreased bone mineral density, uric acid and metabolic syndrome

OBJECTIVE: The relationship between decreased bone mineral density (BMD) and chronic kidney disease (CKD) is controversial. The associations among metabolic syndrome (MetS), serum uric acid and CKD are also unclear. We aimed to investigate the relationship between decreased BMD, MetS, serum uric acid and CKD in a general population. METHODS: A total of 802 subjects who visited a medical center in Southern Taiwan and underwent a BMD measured by dual-energy X-ray absorptiometry (DEXA) during a health examination were enrolled in this retrospective cross-sectional study. Either osteopenia or osteoporosis was defined as decreased BMD. CKD was defined as the estimated glomerular filtration rate (eGFR) of less than 60 mL/min/1.73m(2). Simple and multivariate logistic regression analyses were used to investigate the association between variables, decreased BMD and CKD. RESULTS: Of the 802 subjects with a mean age of 54.4±10.2 years, the prevalence of decreased BMD was 62.9%, and CKD was 3.7%. Simple logistic analysis showed that sex (OR 3.50, 95% CI 1.21–10.12, p = 0.021), age (OR 1.14, 95% CI 1.07–1.21, p<0.001), BMI (OR 1.11, 95% CI 1.01–1.22, p = 0.028), waist circumference (OR 1.06, 95% CI 1.02–1.10, p = 0.002), SBP (OR 1.03, 95% CI 1.01–1.04, p = 0.003), DBP (OR 1.03, 95% CI 1.00–1.06, p = 0.030), HDL-C (OR 0.97, 95% CI 0.94–1.00, p = 0.026), uric acid (OR 1.84, 95% CI 1.49–2.27, p<0.001), metabolic syndrome (OR 2.68, 95% CI 1.29–5.67, p = 0.009), and decreased BMD (OR 3.998, 95% CI 1.38–11.57, p = 0.011) were significantly associated with CKD. Multivariate analysis showed that age (OR 1.05, 95% CI 1.03–1.07, p<0.001), decreased BMD (OR 0.64, 95% CI 0.45–0.91, p = 0.013), and uric acid (OR 1.40, 95% CI 1.24–1.59, p<0.001) were significantly independently associated with CKD. CONCLUSIONS: Decreased BMD, uric acid and MetS were significantly associated with CKD.. Further large and prospective cohort studies are necessary to investigate whether management of osteoporosis, hyperuricemia, or MetS might prevent the progression of CKD.