Introduction. The problem of impaired urodynamics of the lower urinary tract after reconstructive surgery of the pelvic ureter remains almost unexplored in modern literature. There are only a few publications about the effect of operations in the area of the ureterovesical segment on bladder function.
Aim. To study the function of bladder after replacing the pelvic ureter with bladder flap, small intestine or appendix.
Materials and Methods. We performed a retrospective analysis of reconstructive operations of the distal ureter, which were performed in 273 patients. Boari flap or its modifications were used in 142 (52%) cases; ureteroappendicocystanastomosis – 23 (8.4%) patients, and replacement of the pelvic ureter with small intestine in 105 (38.5%) cases. A follow-up urodynamics was carried out on the 10-14th day of the postoperative period, after 3 months, then after 6 and 12 months. We evaluated: uroflowmetry, cystometry, and pressure‐flow study.
Results. In 75 (53%) of 142 patients who underwent Boari flap or its modifications, varying degrees of disturbance of bladder urodynamics were observed. After isoperistaltic intestinal ureteroplasty in 2 (2.5%) of 79 patients, detrusor hyperactivity was observed, which was regressed following conservative therapy. Urodynamics of bladder did not suffer after appendicoplasty.
Conclusion. Deformation, denervation and devascularization of detrusor are the main causes of bladder dysfunction after flap operations. Ileal ureter substitution with isoperistaltic position of the graft provides physiological passage urine from the kidney to the bladder, following good bladder function. The inclusion of antiperistaltic ileal loop in the urinary tract negatively affects the urodynamics.

Keywords: Boari flap, intestinal plastic, urodynamic, stricture, ureter