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Perineal Urethrostomy (PU) in Cats

By: Dr. Cathy Reese

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Perineal Urethrostomy (PU) is the medical term for the creation of a new opening in the urethra (the tube which carries urine from the bladder to the outside). This is done in the perineum, which is the area between the scrotum and anus. A PU is done to bypass the smaller diameter urethra in the penis and open the larger diameter urethra in the pelvic area.

Indications for a PU include:

  • Chronic urethral obstruction as a result of Feline Urologic Syndrome (FLUTD)
  • Obstruction due to urinary tract stones
  • Damage to the urethra from an injury or from a urinary catheter

    The cause for FLUTD is unknown. Most cats with FLUTD are young adult neutered males, 2-6 years old. They are often sedentary and overweight. They develop grit and plugs of debris in their urine which can obstruct the flow of urine out the urethra.

    If the animal has suffered trauma to the pelvis, especially if there are fractured pelvic bones, the urethra can become damaged as well. These cats may also require urethrostomies.

    Cats that are obstructed due to FLUTD need to be unobstructed by means of a urinary catheter. This can be difficult and can result in damage to the urethra. If the urethra is damaged, or if a catheter is unable to be passed, a PU may be necessary.

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