A 46-year-old male presents with a 6-hour history of a painful erection.

1. Differentiate ischaemic from non-ischaemic priapism. 8 marks

You suspect ischaemic priapism. Alternative methods to achieve detumescence have failed, including exercise and oral pseudoephedrine.

2. Describe a step-wise approach to the management of ischaemic priapism including drugs and doses. 4 marks