[TREATMENT OUTCOMES OF BLADDER NECK CONTRACTURE AFTER TRANSURETHRAL PROSTATE SURGERY]

(Introduction) A known complication of the surgical treatment of benign prostatic hyperplasia (BPH) is bladder neck contracture (BNC). BNC is often treated using transurethral incision of the bladder neck (TUI-BN); however, there are few reports on the outcomes of TUI-BN. Therefore, we examined the outcomes of patients who underwent TUI-BN after transurethral prostate surgery. (Material and methods) We retrospectively examined 25 patients who underwent TUI-BN between February 2015 and January 2021 for the following: (1) patients' characteristics; (2) the time from transurethral prostate surgery to TUI-BN; (3) the trigger of BNC diagnosis; (4) surgical procedure of BNC repair/perioperative course; (5) micturition function immediately after TUI-BN; and (6) Postoperative outcomes. (Results) The median age of the patients was 77 years, and the surgical procedures for BPH were transurethral resection of the prostate (TURP) in four cases, transurethral resection in saline plasma vaporization of the prostate (TURisP) in nine cases, and transurethral enucleation with bipolar (TUEB) in 12 cases. The median time to onset of BNC symptoms was 364 days, and 18 patients (72%) were diagnosed within 2 years. The trigger of BNC diagnosis was urinary symptoms in 21 cases, of which 16 patients had exacerbation of urination. The median duration of the surgical procedure of BNC repair was 14 min, and the incisions most frequently used (in 44% of cases) were at the 4 o'clock and 8 o'clock positions. Transient stress urinary incontinence was observed as a complication in three cases. In the 4 o'clock and 8 o'clock incisions, the maximum urine flow rate improved significantly (11.1 mL/s perioperatively vs. 20.9 mL/s postoperatively; P=0.004). These symptoms improved in 16 of the 21 symptomatic cases, and the maximum urine flow rate improved significantly (P< 0.01). The median observation period after surgery was 170 days; eight postoperative patients were lost to follow up. There were two cases of recurrence. (Conclusions) BNC is likely to develop within 2 years after transurethral prostate surgery. In this study, the success rate of the initial TUI-BN was 92%, as reoperation was required in two cases; however, the overall prognosis was good.