A 72-year-old man presents to your Emergency Department with confusion and decreased urine output over the past 48 hours. He has a history of hypertension and osteoarthritis. Vitals are as follows : HR 100 BP 92/58 RR 24 Sats 97%RA T 37.7°C VBG is taken : pH 7.28 HCO3 18 mmol/L K 6.5 mmol/L Cr 280 micromol/L

1. List and justify (4) investigations you will undertake. (4 marks) 4 marks

2. Outline your priorities of management. (4 marks) 4 marks

3. Give (4) general indications for renal replacement treatment in acute kidney injury. (4 marks) 4 marks