Age, Gender, Height, Weight, diagnosis requiring ICU admission, location of venous and arterial catheters, APACHE II scores, Cumulative fluid balance at time of bolus administration, Ventilation status (self-ventilating, non-invasive ventilation, invasive ventilation and mode if appropriate), tidal volume if measured, drugs being infused (sedatives, inotropes, vasoactive drugs, diuretics, muscle relaxants, etc), presence of renal replacement therapy.