A nurse is assessing a client in the oliguric phase of acute kidney injury (AKI). Which of the following findings should the nurse expect?

A. Hyperkalemia: During the oliguric phase of AKI, the kidneys cannot excrete potassium effectively, leading to accumulation in the blood. This can result in serious complications such as cardiac arrhythmias and requires close monitoring. B. Hypomagnesaemia: Magnesium is typically retained during AKI due to impaired renal excretion, making hypermagnesemia more likely. Hypomagnesemia is not expected in this phase. C. Decreased creatinine level: Creatinine is a waste product cleared by the kidneys. In AKI, especially the oliguric phase, decreased urine output causes serum creatinine to rise, not fall. D. Increased glomerular filtration rate (GFR): The GFR decreases significantly during the oliguric phase due to impaired kidney function. An increased GFR would be inconsistent with this phase of AKI.