[Intestinal motility and its variations in replacement bladder and intestine]

Area of Science:

• Urology
• Gastroenterology
• Surgical Engineering

Background:

• Urinary bladder replacement often utilizes intestinal segments, known as neobladders.
• Intestinal motor activity is complex, regulated by hormonal and neurological factors.
• Understanding neobladder function post-oral intake is crucial for patient outcomes.

Purpose of the Study:

• To compare motor activity in intact bowel versus intestinal urinary reservoirs after oral intake.
• To investigate the impact of meal consumption on duodenal and neobladder motor patterns.
• To evaluate how reservoir composition and shape influence postprandial motor activity.

Main Methods:

• Simultaneous recording of pre- and post-prandial motor activities in the duodenum and neobladder.
• Study involved 4 patients with tubular entero-cystoplasty (Camey I) and 14 patients with various ileal, ileocecal, or colic reservoirs (tubular and non-tubular).
• Standardized oral intake (570 Kcal) was administered to trigger motor responses.

Main Results:

• A standard meal induced similar motor activity in the duodenum and Camey I reservoirs.
• Non-tubular colic or ileocolic reservoirs demonstrated greater compliance than ileal reservoirs.
• Ileal neobladders exhibited significant increases in basal pressure and motor activity post-intake, unlike colic/ileocolic reservoirs.

Conclusions:

• Postprandial motor activity differs significantly between ileal and colic/ileocolic neobladders.
• The higher motor activity in ileal reservoirs, particularly at night, may contribute to nocturnal urinary leakage.
• Reservoir compliance is influenced by tissue origin and shape, impacting functional outcomes.