Cats with mild urethral obstruction are anesthetized, the obstruction removed and the bladder lavaged. Moderately affected cats are sedated and given IV fluids, and usually return to normal soon after the obstruction is removed. Severely affected cats are given IV fluids, NaHCO3 and Ca gluconate, sedated or anesthetized and unblocked. Fluid administration is continued to avoid renal failure. The bladder can be expressed 3-4 times daily or bethanechol given to aid recovery of detrusor muscle function. Halothane, 1% thiopental or thiamylal, or ketamine-acepromazine can be used to anesthetize blocked cats. An 18- or 20-ga, 2 1/2-inch over-the-needle catheter or a lacrimal needle is used to relieve the obstruction, after which a 3 1/2-Fr Silastic or vinyl catheter is used for catheterization and bladder lavage with sterile saline. Cystotomy allows recuperation before definitive corrective surgery.
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