Virtual Patients - Otology - Otorrhea

The patient undergoes a modified radical mastoidectomy with no intra-operative complications. At the end of the operation, the patient has BIPP (Bismuth Iodine Paraffine Paste) packing inserted into the ear and a head bandage applied. It is planned he goes home later the same day.

 

However, you are called to see the patient on the ward later that evening who is now complaining of slight dizziness, nausea and is concerned by the significant deterioration in hearing in the left ear (side of the operation). These symptoms have been present since awaking from the operation.  

 

Question.

Which of the following is your first line investigation?