TTR and infection: Low mean arterial pressure, low serum prealbumin level, infection, a need for mechanical ventilation, high BUN level, blood magnesium level, and more severe AKI stage were independent risk factors affecting the short-term mortality of AKI patients in the 48-h diagnostic window, whereas low BMI, low mean arterial pressure, low prealbumin level, low albumin level, high BUN level, and more severe AKI stage were independent risk factors affecting the short-term mortality of AKI patients in the 7-day diagnostic window.