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Prevalence of chronic kidney disease in patients with spinal cord injuries/disorders.

Fischer MJ, Krishnamoorthi VR, Smith BM, Evans CT, St Andre JR, Ganesh S, Huo Z, Stroupe KT. Prevalence of chronic kidney disease in patients with spinal cord injuries/disorders. American Journal of Nephrology. 2013 Jun 10; 36(6):542-8.

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BACKGROUND AND OBJECTIVES: Chronic kidney disease (CKD) and spinal cord injury and disorders (SCI/D) are common and costly conditions among Veterans. However, little is known about CKD among adults with SCI/D. METHODS: We conducted cross-sectional analyses of Veterans with SCI/D across all VA facilities in 2006. CKD was defined as an estimated glomerular filtration rate (eGFR) < 60 ml/min/1.73 m(2) and categorized by standard eGFR strata. eGFR was calculated in two ways: (a) the Modification of Diet in Renal Disease (MDRD) equation and (b) the MDRD equation + an empirically derived correction factor for SCI/D (MDRD-SCI/D). Logistic regression models were used to examine the relationship between patient characteristics and CKD. RESULTS: Among 9,333 SCI/D Veterans with an available eGFR, the proportion with CKD was substantially higher based on the MDRD-SCI/D equation (35.2%) than based on the MDRD equation (10.2%). In adjusted analyses, while older age (OR for > 65 years = 2.53; 95% CI: 2.21-2.89), female sex (OR 2.18; 95% CI: 1.62-2.92), and a non-traumatic cause for injury (OR 1.39; 95% CI: 1.23-1.57) were associated with an increased odds of CKD, black race (OR 0.64; 95% CI: 0.56-0.72) and a duration of injury of = 10 years (OR 0.76; 95% CI: 0.67-0.86) were associated with a decreased odds of CKD. Diagnostic codes for CKD and nephrology visits were infrequent for SCI/D Veterans with CKD (27.51 and 6.58%, respectively). CONCLUSION: Using a recently validated version of the MDRD equation with a correction factor for SCI/D, over 1 in 3 Veterans with SCI/D had CKD, which is more than 3-fold higher than when traditional MDRD estimation is used.

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