ABSTRACT Highlights Renal involvement was frequent in patients with COVID-19 and related to worse outcomes. Diuretic use, mechanical ventilation, proteinuria, hematuria, age, and creatine phosphokinase and D-dimer levels were risk factors for acute kidney injury. Acute kidney injury, mechanical ventilation, elevated SOFA Score, and elevated ATN-ISS were associated with mortality. The second wave was associated with greater severity; however, the mortality rates were similar between the two periods. This may reflect the effectiveness of vaccines and the constant learning that […]