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New Treatment Improves Survival in Late-stage Chronic Kidney Disease

by Colleen Fleiss on June 15, 2019 at 6:28 PM
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New Treatment Improves Survival in Late-stage Chronic Kidney Disease

In people with late-stage chronic kidney disease (CKD) the benefits of correcting metabolic acidosis with sodium bicarbonate have been reported, revealed results of the UBI trial announced for the first time during the ERA-EDTA Congress in Budapest.

Defined as serum bicarbonate less than 22 mmol/L [2], metabolic acidosis is common in people with CKD stages 4-5 (eGFR < 30 ml/min/1.73 m2) and is directly related to worsening kidney function. Metabolic acidosis is a problem because it is associated with complications such as bone disease, muscle wasting, high levels of blood potassium (hyperkalaemia), insulin resistance, high cholesterol (hyperlipidaemia), and with a more rapid decline in kidney function--shown by rising blood creatinine--and increased risk of death [3].

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International guidelines recommend that, when serum bicarbonate concentration falls below 22 mmol/l, CKD patients should be treated with oral sodium bicarbonate to maintain serum bicarbonate within the normal range, unless contraindicated [2]. However, until recently, very few studies have tested the effectiveness of bicarbonate therapy in improving metabolic acidosis or its potential benefits in patients with CKD.

The prospective, open-label, randomized controlled trial assigned 740 patients with CKD-3b and CKD stage 4 to either sodium bicarbonate (376 patients) or standard care without sodium bicarbonate (364 patients). The patients had a mean age of 67.8 years, creatinine clearance 30 ml/min, and serum bicarbonate 21.5 mmol/l. At the end of three years, doubling of creatinine occurred in significantly fewer patients randomized to sodium bicarbonate: 6.6% versus 17.0% receiving standard care, p<0.001. This translates into a relative risk reduction of 64% in kidney disease progression (hazard ratio [HR] 0.36; 95% confidence interval [CI] 0.22-0.58; p<0.001).
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Similarly, the likelihood of starting RRT was also significantly lower in the sodium bicarbonate group. At the end of the study, 6.9% of patients receiving sodium bicarbonate had started RRT compared to 12.3% of the standard care group--a relative risk reduction of 50% (p=0.004; HR: 0.5; 95% CI: 0.31-0.81; p=0.005). The risk of death was also significantly lower among sodium bicarbonate-treated patients at 3.1% compared to 6.8 % of the standard care group--a relative risk reduction of 57% (p=0.004; HR 0.43; 95%CI 0.22-0.87; p=0.01). Treatment with sodium bicarbonate was well tolerated, with no significant effects on blood pressure, total body weight or hospitalizations.

"There are relatively few treatments that have been shown to slow progression of CKD. As nephrologist, we have used sodium bicarbonate to correct metabolic acidosis in people with CKD for some time, but definite evidence of benefit has been lacking. Our study shows that this very cost-effective treatment is safe and improves kidney and patient survival," concluded lead investigator Dr Antonio Bellasi.

Source: Eurekalert
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