MRCP2-3888

A 26-year-old factory worker presents after an accident at work. He suffered a crush injury when a heavy machine fell on his leg, and he was trapped for over an hour. The orthopaedic team cleared him of any fractures, but fasciotomies were performed due to concerns about compartment syndrome. However, his urine output over the last four hours was only 35 mL, despite a mean arterial pressure of 70 mmHg. His blood results showed elevated levels of creatine kinase, potassium, urea, and creatinine, with a normal haemoglobin level and pH of 7.35. What is the most important management plan to initiate?