Neobladder “Belgrade pouch”: Metabolic consideration.

Area of Science:

• Urology
• Surgical Innovation
• Metabolic Medicine

Background:

• Ileal neobladders require a balance between reservoir capacity and surface area to minimize urine metabolite resorption and metabolic disturbances.
• Standard neobladders, created from longer ileal segments, can lead to systemic metabolic complications.
• A too-small pouch may result in urinary frequency and incontinence.

Purpose of the Study:

• To investigate the feasibility of creating a neobladder from a shorter ileal segment.
• To assess if a shorter segment reduces metabolic complications compared to standard techniques.

Main Methods:

• A prospective study comparing 77 male patients undergoing radical cystectomy and orthotopic neobladder.
• Patients were divided into a standard pouch (SP) group (50–70 cm ileal segment) and a Belgrade pouch (BP) group (25–35 cm ileal segment).
• Neobladder capacity, acidosis, base excess, and bicarbonate levels were measured postoperatively.

Main Results:

• The SP group had significantly higher neobladder capacity (mean 750 mL) than the BP group (mean 438 mL) (p < 0.001).
• The SP group showed higher rates of acidosis (37.8% vs. 2.5%), base excess (35.1% vs. 7.5%), and low bicarbonate (40.5% vs. 20.0%) compared to the BP group (p < 0.001).

Conclusions:

• The Belgrade pouch, constructed from a 25–35 cm ileal segment, achieves adequate capacity.
• This technique results in a lower incidence of metabolic disturbances compared to standard, high-capacity orthotopic neobladders.