Although this is usually difficult in a patient with BPH, it relieves and prevents urinary retention and rules out presence of ureteral stricture. Coudé catheter may be required because the curved tip eases passage of the tube through the prostatic urethra. Note: Bladder decompression should be done with caution to observe for sign of adverse reaction such as hematuria (rupture of blood vessels in the mucosa of the overdistended bladder) and syncope (excessive autonomic stimulation).