Urethral Stricture in Cats: Welfare and Surgical Management
Urethral Stricture Overview
Urethral stricture (narrowing of the urethra) in male cats is most commonly a consequence of repeated urethral obstruction or urethral catheterisation. Scar tissue forms at the catheter insertion site or obstruction location, progressively narrowing the urethra. Affected cats present with signs of partial or complete obstruction: dysuria, stranguria, haematuria, and in complete obstruction, systemic illness (vomiting, depression, acute kidney injury). It represents a welfare emergency and chronic welfare problem.
Welfare Impact
Cats with urethral stricture experience repeated episodes of partial or complete obstruction, each causing significant pain and distress. The inability to urinate freely is acutely uncomfortable. Repeated hospitalisation for urethral unblocking causes significant stress. Progressive stricture worsening means medical management becomes increasingly ineffective over time. The chronic nature and recurrent acute episodes make urethral stricture a significant welfare problem requiring definitive surgical resolution.
Medical Management Limitations
Initial management of urethral obstruction (urethral catheterisation, IV fluids, management of acute kidney injury) is essential but does not address the underlying stricture. Repeated catheterisation causes further trauma and may worsen the stricture. Medical management of lower urinary tract disease (dietary modification, stress reduction, anti-inflammatory treatment) reduces risk factors for further obstruction but cannot reverse structural narrowing.
Perineal Urethrostomy
Perineal urethrostomy (PU) is the surgical creation of a permanent, wider urethral opening by removing the penile urethra and creating a stoma at the level of the wider pelvic urethra. It significantly reduces the risk of future obstruction by creating a permanently wider opening. In cats with strictures or recurrent obstruction despite adequate medical management, PU dramatically improves welfare. Post-operative complications include stricture at the surgical site, UTI, and urinary incontinence (rare).
Long-term Welfare After PU
Most cats achieve significant welfare improvement after PU: reduced frequency of obstruction, reduced distress, and improved quality of life. Post-operative care involves: Elizabethan collar to prevent self-trauma; antibiotics for UTI prevention; monitoring of urination frequency and stream; and regular urinalysis to detect UTI. Owners should be educated about the continued importance of diet, hydration, and stress reduction in reducing FLUTD recurrence even after PU.