The evolution of artificial sphincter cuff in growing animals

Area of Science:

• Urology
• Pediatric Surgery
• Animal Modeling

Background:

• Artificial urinary sphincter implantation is a treatment for urinary incontinence.
• The effects of artificial sphincter cuffs on the developing urethra, particularly in pediatric patients, require further investigation.

Purpose of the Study:

• To develop and evaluate an animal model simulating the impact of artificial sphincter cuff implantation on the urethra in pediatric patients.
• To assess the morphological and histological effects of artificial sphincter cuffs on urethral and prostatic tissues in a porcine model.

Main Methods:

• A porcine model with 28 pigs (castrated males, uncastrated males, females) divided into control, operated, and sham groups.
• Implantation of an AS 800 artificial sphincter cuff around the urethra in young and adult pigs.
• Follow-up for 6-8 weeks, followed by morphological and histological examination.

Main Results:

• Significant transmural atrophy of the urethra and prostate was observed in young, growing male pigs (castrated and uncastrated).
• Mild changes were noted in young female pigs; bladder rupture occurred in three uncastrated males.
• Variable upper tract changes and renal deterioration were observed in the young pig group, predominantly in males.

Conclusions:

• The animal model demonstrated that artificial sphincter cuffs can cause significant urethral and renal damage in young, growing males.
• Findings suggest a potential risk of similar adverse effects in young male children following artificial sphincter implantation.
• Adult pigs and sham-operated animals did not exhibit these detrimental changes.