Post-ACDF Neck Haematoma with Airway Obstruction

You are called to assess a 40-year-old woman in the surgical ward while working as the evening on-call anaesthetist. The patient has had an anterior cervical discectomy and fusion (ACDF) for cervical radicular symptoms caused by C5/6 disc prolapse. The operation was completed six hours ago with 500mL of blood loss. You have been asked to review the patient because of increasing neck pain. Medications: - paracetamol 1g orally q6h - ibuprofen 400 mg orally q8h - pregabalin 75 mg orally q12h - oxycodone-with-naloxone controlled-release 20/10 mg orally q12h - oxycodone 5 to 10mg orally q4h