If urethral injury is suspected, urethral integrity should be confirmed by a retrograde urethrogram before the catheter is inserted.
如果怀疑有尿道损伤,在置管前应先行逆行性尿道造影以确定尿道的完整性。
英语百科
Retrograde urethrogram
A retrograde urethrogram is a routine radiologic procedure (most typically in males) used to image the integrity of the urethra.
Hence a retrograde urethrogram is essential for diagnosis of urethral injury, or urethral stricture.