title: Cystometric and in vitro muscle studies of cystoplastic appendiceal segments in the rat.
abstract: OBJECTIVE
  The functional integration of the smooth muscle of enterocystoplasties into the detrusor muscle was investigated in an awake-rat cystometry model and in vitro.
  
  
  METHODS
  The upper fourth of the bladder was removed, and a detubularized appendiceal segment (7 x 7 mm), with preserved vasculature, was incorporated into the bladder. After 1 or 3 months, a catheter was fixed to the top of the bladders. After a 3-day recovery, cystometries were performed. In separate experiments, agonist and nerve-induced responses were evaluated on isolated bladder strips.
  
  
  RESULTS
  Cystometries revealed reduced basal pressure and micturition pressure in enterocystoplasty (ECP) bladders. Bladder capacity and micturition volume were increased. Threshold pressure (pressure immediately before micturition) was significantly lower at 1 month, but not at 3 months. Bladder compliance was significantly higher in the operated at 1 month but not at 3 months. Threshold tension did not differ between control and corresponding operated groups. Residual urine was significantly higher in the operated groups. ECP strips showed increased maximal contractions to nerve stimulation, to levels similar to those of detrusor strips. Maximal responses to carbachol increased to levels between those of intestine and detrusor. The inhibitory effect of scopolamine on nerve induced contractions increased to levels similar to those for detrusor. Purinergic activation had no effect on intestinal or ECP strips, but contracted detrusor muscle.
  
  
  CONCLUSIONS
  The smooth muscle of the bowel segment in rat ECP bladders underwent a partial change in the response to nerve stimulation from that of intestine towards that of detrusor. The cystometry experiments suggested a partial functional integration of the ECP segment into the detrusor.
authors.affiliation: Department of Urology, Lund University Hospital, Lund, Sweden.
authors.forename: Yavor
authors.initials: Y
authors.lastname: Semerdzhiev
authors.affiliation: Department of Urology, Lund University Hospital, Lund, Sweden.
authors.forename: Hans
authors.initials: H
authors.lastname: Frederiksen
authors.affiliation: Department of Clinical Pharmacology, Lund University Hospital, Lund, Sweden.
authors.forename: Petter
authors.initials: P
authors.lastname: Hedlund
authors.affiliation: Department of Urology, Lund University Hospital, Lund, Sweden.
authors.forename: Thomas
authors.initials: T
authors.lastname: Davidsson
authors.affiliation: Department of Urology, Lund University Hospital, Lund, Sweden.
authors.forename: Wiking
authors.initials: W
authors.lastname: Mansson
authors.affiliation: Department of Urology, Lund University Hospital, Lund, Sweden.
authors.forename: Bengt
authors.initials: B
authors.lastname: Uvelius
mesh_terms: D000818:Animals; D001065:Appendix / Q000637:transplantation*; D005260:Female; D066298:In Vitro Techniques; D008365:Manometry; D009130:Muscle, Smooth / Q000502:physiology* / Q000601:surgery*; D051381:Rats; D017207:Rats, Sprague-Dawley; D001743:Urinary Bladder / Q000502:physiology* / Q000601:surgery*; D013520:Urologic Surgical Procedures / Q000379:methods