COVID-19 and the Kidneys, Implications and Outcomes

Area of Science:

• Nephrology
• Infectious Diseases
• Critical Care Medicine

Background:

• COVID-19 pandemic has caused widespread mortality.
• SARS-CoV-2 virus enters host cells via ACE-2 and CD147.
• Common comorbidities in hospitalized COVID-19 patients include hypertension, diabetes, and obesity.

Purpose of the Study:

• To review the incidence, mechanisms, and outcomes of acute kidney injury (AKI) in COVID-19 patients.
• To highlight the increased need for critical care and renal replacement therapy (RRT) in COVID-19 patients with AKI.
• To discuss the mortality risks associated with AKI and RRT in this population.

Main Methods:

• Review of existing studies on COVID-19 and kidney injury.
• Analysis of reported incidence rates of AKI in hospitalized and ICU COVID-19 patients.
• Examination of proposed pathophysiological mechanisms of AKI in COVID-19.

Main Results:

• High incidence of AKI reported in hospitalized (10-43%) and ICU (43-75%) COVID-19 patients.
• Proteinuria and hematuria are common and associated with higher in-hospital mortality.
• COVID-19 patients with AKI exhibit increased requirements for mechanical ventilation, vasopressors, and RRT.

Conclusions:

• AKI is a frequent and severe complication of COVID-19, significantly increasing mortality risk.
• Mechanisms include acute tubular injury, cytokine storm, endothelial dysfunction, and direct viral effects.
• Optimal RRT strategies require careful consideration of clinical status, disease trajectory, and resource availability, particularly for kidney transplant recipients and CKD patients.