Effects of augmentation cystoplasty on bladder contractility in rabbits.
OBJECTIVE
An experimental study was conducted to investigate the effects of colocystoplasty and prefabricated cystoplasty on the bladder contractility in rabbits.


METHODS
Twenty-eight female New Zealand rabbits were randomly allocated into sham-operated controls, sigmoid enterocystoplasty (SECP), and prefabricated enterocystoplasty (PECP) groups. Augmentation cystoplasty with a 2-cm colon segment was performed in the SECP group. Mucosa was removed from the isolated sigmoid colon and covered with uroepithelial grafts from the bladder mucosa in the PECP group. Two weeks after the replacement of mucosa, enterocystoplasty was performed. Isometric contractions obtained by electrical field stimulation (EFS) and acetylcholine were evaluated in the bladder strips, 3 weeks after the operations.


RESULTS
Bladder strips obtained from the experimental groups displayed similar basal rhythmic activity. Electric field stimulation elicited a frequency-dependent contractile activity, which was lower between 1 to 20 Hz stimulation in the SECP- and PECP-operated animals. Acetylcholine elicited concentration-dependent contractions in all groups. Acetylcholine-induced contractile responses were greater in the PECP group.


CONCLUSIONS
This study demonstrated that an augmented bladder prepared either with a sigmoid colon or prefabricated seromuscular flap displayed contractile activity similar to normal bladder.
Ozkan-Ulu
Hulya
H
Department of Pediatric Surgery, Faculty of Medicine, Ankara University, Ankara, Turkey.
Ulu
Nadir
N
Bingol-Kologlu
Meltem
M
Onur
Rustu
R
Aktug
Tanju
T
D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D003106:Colon / Q000601:surgery; D004558:Electric Stimulation; D005260:Female; D009119:Muscle Contraction; D018377:Neurotransmitter Agents / Q000494:pharmacology; D011817:Rabbits; D001743:Urinary Bladder / Q000502:physiology* / Q000601:surgery*; D013520:Urologic Surgical Procedures; D019459:Urothelium / Q000502:physiology*
D018377:Neurotransmitter Agents; D000109:Acetylcholine