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Published on: September 24, 2020
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Prospective Multicenter Study on Early Proximal Tubular Injury in COVID-19-Related Acute Respiratory Distress
Mickaël Bobot1,2,3, Xavier Heim2,4, Howard Max5
1Centre de Néphrologie et Transplantation Rénale, Hôpital de la Conception, AP-HM, Marseille, France.
Kidney International Reports
|June 20, 2024
Summary
COVID-19 patients with ARDS show early kidney dysfunction, specifically proximal tubular damage, before acute kidney injury (AKI) onset. Urinary protein analysis can reliably detect this tubular dysfunction in the ICU.
Area of Science:
- Nephrology
- Critical Care Medicine
- Infectious Diseases
Background:
- Renal impairment is a significant predictor of poor outcomes for patients in intensive care units (ICUs), particularly those with COVID-19.
- Early identification of renal dysfunction is crucial for managing patients with COVID-19-related acute respiratory distress syndrome (ARDS).
Purpose of the Study:
- To investigate the presence, incidence, and prognostic significance of early renal dysfunction in patients with COVID-19 ARDS.
- To evaluate urinary protein markers for early detection of kidney injury.
Main Methods:
- A prospective multicenter study involving 135 patients (100 COVID-19 ARDS, 35 non-COVID-19 ARDS) requiring mechanical ventilation.
- Assessment of renal dysfunction markers, including urinary protein electrophoresis (UPE) and quantification, within 24 hours of mechanical ventilation initiation.
Main Results:
- COVID-19 ARDS patients exhibited significantly higher rates of tubular dysfunction (68% vs. 21.4%) and early urinary leakage of tubular proteins (beta-2-microglobulin, free light chains) compared to non-COVID-19 ARDS patients.
- COVID-19 ARDS patients showed a trend towards more frequent acute kidney injury (AKI) (51.0% vs. 34.3%) and experienced longer mechanical ventilation (20 vs. 9 days) and ICU stays (26 vs. 15 days).
- Free lambda light chain leakage in COVID-19 ARDS was associated with the onset of KDIGO ≥2 AKI (OR: 1.014, 95% CI 1.003-1.025).
Conclusions:
- COVID-19 ARDS patients develop proximal tubular dysfunction preceding AKI, indicating a key mechanism in COVID-19-induced nephropathy.
- Urinary protein analysis serves as a reliable, noninvasive method for assessing proximal tubular dysfunction in ICU settings.
- Early detection of tubular dysfunction can aid in predicting AKI development in COVID-19 patients.
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