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American Journal of Kidney Diseases

Association Between Kidney Clearance of Secretory Solutes and Cardiovascular Events: The Chronic Renal Insufficiency Cohort (CRIC) Study

Published:January 06, 2021DOI:https://doi.org/10.1053/j.ajkd.2020.12.005

      Rationale & Objective

      The clearance of protein-bound solutes by the proximal tubules is an innate kidney mechanism for removing putative uremic toxins that could exert cardiovascular toxicity in humans. However, potential associations between impaired kidney clearances of secretory solutes and cardiovascular events among patients with chronic kidney disease (CKD) remains uncertain.

      Study Design

      A multicenter, prospective, cohort study.

      Setting & Participants

      We evaluated 3,407 participants from the Chronic Renal Insufficiency Cohort (CRIC) study.

      Exposures

      Baseline kidney clearances of 8 secretory solutes. We measured concentrations of secretory solutes in plasma and paired 24-hour urine specimens using liquid chromatography–tandem mass spectrometry (LC-MS/MS).

      Outcomes

      Incident heart failure, myocardial infarction, and stroke events.

      Analytical Approach

      We used Cox regression to evaluate associations of baseline secretory solute clearances with incident study outcomes adjusting for estimated GFR (eGFR) and other confounders.

      Results

      Participants had a mean age of 56 years; 45% were women; 41% were Black; and the median estimated glomerular filtration rate (eGFR) was 43 mL/min/1.73 m2. Lower 24-hour kidney clearance of secretory solutes were associated with incident heart failure and myocardial infarction but not incident stroke over long-term follow-up after controlling for demographics and traditional risk factors. However, these associations were attenuated and not statistically significant after adjustment for eGFR.

      Limitations

      Exclusion of patients with severely reduced eGFR at baseline; measurement variability in secretory solutes clearances.

      Conclusions

      In a national cohort study of CKD, no clinically or statistically relevant associations were observed between the kidney clearances of endogenous secretory solutes and incident heart failure, myocardial infarction, or stroke after adjustment for eGFR. These findings suggest that tubular secretory clearance provides little additional information about the development of cardiovascular disease events beyond glomerular measures of GFR and albuminuria among patients with mild-to-moderate CKD.

      Graphical abstract

      Index Words

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