MRCP2-3700

A 78-year-old patient has been diagnosed with metastatic lung cancer. They are currently taking 30 mg of oral morphine sustained release twice a day and have taken 60 mg of PRN breakthrough Oramorph on each of the last three days. However, during the ward round, they complain of vomiting and difficulty keeping their medication down. The medical team decides to switch their analgesia to a diamorphine subcutaneous infusion pump. What is the appropriate dose of diamorphine to be placed in the infusion pump over 24 hours?