Serum Phosphorus Levels can Help Predict Kidney Failure Risk in African-Americans

Chronic kidney disease (CKD) refers to a gradual loss of the kidney function. An increase in serum phosphorus levels in African Americans with CKD is associated with faster progression to kidney failure, known as end-stage renal disease (ESRD). The research, from the Indiana University School of Medicine, was presented at ASN Kidney Week 2015 November 3-8, 2015, at the San Diego Convention Center in San Diego, CA.

Previously confirmed in primarily Caucasian populations, the new study confirms serum phosphorus is linked to ESRD risk in African Americans.

African Americans are more than three times as likely to progress to kidney failure as Caucasians and account for 32% of individuals with ESRD. Because of this, Indiana University School of Medicine researchers led by Jonathan Bazeley wanted to determine if serum phosphorus, which in previous studies of mainly Caucasian populations was associated with adverse outcomes in CKD patients, was an effective predictor in African Americans as well. African Americans and Caucasians differ in how they maintain balance of vitamin D and parathyroid hormone, which is why it was unknown if serum phosphorus levels would be an effective predictor in this population.

‘Previously confirmed in Caucasian populations, the new study confirms that serum phosphorus is linked to End Stage Renal Disorder risk in African Americans. An increase in serum phosphorus levels in Chronic Kidney Disease patients is associated with faster progression to kidney failure.’

Investigators performed a retrospective analysis of 754 predominantly African American patients from an urban CKD clinic who were followed over a period of two to five years. Serum phosphorus was a significant predictor of progression to the study end point of dialysis initiation (HR 1.44, 95% CI 10.7-1.93), even after controlling for age, sex, race, smoking status, diabetic status, BMI, and other biomarkers.

e authors concluded, "The results suggest phosphorus may have independent negative consequences on CKD progression. Testing this would require trials that evaluate lowering serum phosphorus on progression to dialysis."

Source: Eurekalert

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