Urinary manometry in spinal cord injury patients. External urethral sphincter pressure recordings before and after sphincterotomy.

Recordings of local pressure within the membranous urethra were performed in 15 male spinal cord injury patients before and after external sphincterotomy. Transurethral division of the external sphincter reduced the intraurethral pressure by 55% in the upper part of the membranous urethra and by 66% in the lower part. The local pressure within the membranous urethra seems to diminish in proportion to the importance of the incision of the urethral wall.