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Kidney Tubule Secretion and AKI After Cardiac Surgery.
Orlando M Gutiérrez1, Ashutosh Tamhane1, Jennifer A Frey2
1Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.
Greater kidney tubule secretion in healthy adults may lower the risk of acute kidney injury (AKI) after coronary artery bypass graft (CABG) surgery. This finding suggests secretion markers could predict AKI risk.
Area of Science:
- Nephrology
- Cardiology
- Public Health
Background:
- Impaired kidney tubule secretion is linked to declining kidney function.
- The association between tubular secretion and acute kidney injury (AKI) risk remains unclear.
Purpose of the Study:
- To investigate the association between endogenous measures of kidney tubule secretion and the risk of AKI following coronary artery bypass graft (CABG) surgery.
Main Methods:
- The study analyzed 397 participants from the Reasons for Geographic and Racial Differences in Stroke study who underwent CABG.
- A summary secretion score of 11 endogenous markers was calculated and assessed for its association with AKI risk post-CABG.
- Analyses adjusted for confounders including estimated glomerular filtration rate (eGFR) and albuminuria.
Main Results:
- 177 participants developed AKI post-CABG.
- Higher kidney secretion scores were associated with a lower risk of AKI (RR: 0.49, 95% CI: 0.32-0.74) after adjusting for multiple confounders.
- This association remained significant after further adjustment for eGFR and albuminuria, and was stronger in women.
Conclusions:
- In community-based adults, enhanced kidney tubule secretion is linked to a reduced risk of AKI after CABG surgery.
- These findings highlight the potential of secretion markers as predictors of AKI risk.
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