Impassable urethral strictures: percutaneous transvesical catheterization and balloon dilatation.

Urethral strictures that are impassable in retrograde fashion present a special problem to the urologist because they cannot be managed by standard dilatation techniques or direct-vision internal urethrotomy. Open urethroplasty is usually required. We describe a technique to catheterize the urethra in an antegrade fashion and dilate the strictures.

The relationship of hematocrit levels to skin flap survival length in the pig.

The work of several investigators suggests that anemia may increase the survival length of skin flaps in the dog and the rabbit. The following experiment was designed to study the survival of standardized skin flaps of varying lengths in normocythemic, polycythemic, and anemic pigs. The pig was chosen because of the similarity of its skin to that of human skin.