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Elevated uric acid increases the risk for acute kidney injury
Vijay Lapsia1, Richard J Johnson, Bhagwan Dass
1Division of Nephrology, Mount Sinai School of Medicine, New York, NY, USA.
The American Journal of Medicine
|February 21, 2012
Summary
High preoperative serum uric acid (SUA) levels significantly increase the risk of acute kidney injury (AKI) after cardiovascular surgery. Both low and high SUA levels are associated with worse outcomes, including longer hospital stays and mechanical ventilation.
Area of Science:
- Nephrology
- Cardiovascular Surgery
- Biochemistry
Background:
- Serum uric acid (SUA) is implicated in acute kidney injury (AKI).
- Investigating the role of preoperative SUA in AKI following cardiovascular (CV) surgery is crucial.
Purpose of the Study:
- To determine the incidence of AKI.
- To assess peak serum creatinine (SCr) concentrations.
- To evaluate hospital length of stay and mechanical ventilation duration in relation to preoperative SUA levels.
Main Methods:
- Retrospective study of 190 patients undergoing CV surgery with available preoperative SUA.
- AKI defined as SCr increase ≥0.3 mg/dL within 48 hours post-surgery.
- Univariate and multivariate logistic regression analyses performed.
Main Results:
- Higher preoperative SUA levels correlated with increased AKI incidence.
- A J-shaped curve observed, indicating elevated AKI risk with both hypo- and hyperuricemia.
- Preoperative SUA ≥7 mg/dL associated with a 35-fold increased AKI risk (multivariate analysis).
- Elevated SUA linked to higher peak SCr, longer hospital stays, and increased mechanical ventilation duration.
Conclusions:
- Preoperative SUA is a significant predictor of AKI, higher SCr, and prolonged recovery post-CV surgery.
- A J-shaped relationship exists between SUA levels and AKI risk.
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