My father is 85 year old, had Laser TURP procedure on 25th April, was not able to pass urine, diagnosed again with ultrasound, found some enlargement of prostrate in bladder, was operated again on 1st may with the same procedure and now he could pass urine for 20 days without bleeding. Now from 20th may 2012, he has suddenly stopped passing urine.
Could someone tell what could be the reason and how to treat it.

It becomes urgent with each passing day.