A 62-year-old woman is admitted with acute kidney injury after diarrhoea and vomiting. Her current creatinine is 260 µmol/L, baseline 90 µmol/L. She is oliguric and hypotensive. Which is the most important initial management step?AAssess volume status and restore circulating volume with intravenous fluidsBStart high-dose loop diuretics to force diuresisCStart ACE inhibitor therapy to improve renal perfusionDArrange immediate renal biopsyERestrict fluid intake to avoid fluid overloadCheck my answer