[Mainz pouch II, a modified method of ureterosigmoidostomy]

Area of Science:

• Urology
• Surgical Oncology
• Medical Devices

Context:

• Bladder reconstruction after radical cystectomy poses challenges in maintaining renal function and patient quality of life.
• Traditional ureterosigmoidostomy techniques are associated with significant risks of upper urinary tract complications.
• The development of low-pressure urinary reservoirs aims to mitigate these risks and improve patient outcomes.

Purpose:

• To evaluate the efficacy and safety of the Mainz pouch II, a modified low-pressure ureterosigmoidostomy, in patients requiring urinary diversion.
• To assess the impact of this technique on renal protection, continence, quality of life, and complication rates.

Summary:

• The Mainz pouch II involves detubularizing and reconfiguring a segment of the sigmoid colon to create a low-pressure reservoir for ureteral implantation.
• This technique aims to abolish the bowel's peristaltic activity, thereby preventing gastrointestinal-to-urinary reflux and protecting the kidneys.
• Early complications included suture insufficiency and abdominal wall disruption, which were managed effectively. All patients experienced hyperchloraemic acidosis, managed with medication. For 23 tumor-free patients, the procedure resulted in daytime continence, improved quality of life, and palliation of symptoms, with minimal inflammatory complications, ureteral stricture, or fistula.

Impact:

• The Mainz pouch II demonstrates a technically simple approach to urinary diversion, combining the benefits of ureterosigmoidostomy with a low-pressure reservoir system.
• This method offers a viable solution for bladder reconstruction, enhancing patient quality of life and preserving renal function.
• Further research may explore long-term outcomes and refine management strategies for associated metabolic disturbances.