A 74-year-old man has been suffering from benign prostate hyperplasia for the last 5 years. 4 days ago, after drinking alcohol, an acute urinary retention occurred. At the prehospital stage, his bladder was catheterized with a metallic catheter twice a day. The examination has shown enlarged, dense, and painful epididymis of the right testicle. There is purulent discharge from the urethra. What kind of emergency aid must be provided in this case?