The effects of dialysate acids and divalent ions on calcification and cardiovascular outcomes: old wisdom and new developments

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ID: 328894
2026
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Abstract
Abstract Dialysate calcium (DCa) and magnesium (DMg) and the organic acid used in the A (acid) concentrate have a profound combined influence on intradialytic mineral balance and may influence vascular calcification progression and treatment-related symptoms. Whereas KDIGO recommend a DCa between 1.25 (DCa 1.25) and 1.50 mmol/l (DCa 1.50), the optimal DCa for an individual patient remains uncertain. No consistent mortality difference between DCa 1.50 and 1.25 has been observed. However, DCa 1.50 may induce a positive calcium balance, raising concerns about vascular calcification progression. Conversely, DCa below 1.25 mmol/l has been associated with a higher risk of sudden cardiac death. Compared with acetic acid (Acet-D), citric-acid (Cit-D) reduces calcification propensity of serum, although the effect on vascular calcification progression is inconclusive. Whenever feasible, DCa should be individualized, ideally using estimates of calcium mass balance (CaMB). Because Cit-D generally results in a more negative CaMB than Acet-D solutions at the same nominal DCa, this difference should be considered when prescribing DCa. Increasing DMg from 0.50 to 0.75 mmol/L may improve surrogate cardiovascular outcomes although its effect on clinical outcomes remains to be defined. Overall, Acet-D with DCa 1.25 is a reasonable standard especially when using calcium containing phosphate binders and in patients at risk for adynamic bone disease, whereas in patients with a high risk of sudden cardiac death, frequent intradialytic hypotension or with severe secondary hyperparathyroidism, DCa 1.50 may be a reasonable alternative. Regarding the choice of acid, the use of Cit-D represents a promising alternative pending further clinical evidence.
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Authors Jeroen P Kooman, Karlien J ter Meulen, Peter Kotanko, Bernard Canaud
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Journal clinical kidney journal
Year 2026
DOI
10.1093/ckj/sfag313
URL
https://academic.oup.com/ckj/advance-article-pdf/doi/10.1093/ckj/sfag313/71088956/sfag313.pdf
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