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Investigating the mechanism underlying urinary continence recovery after radical prostatectomy: effectiveness of a longer urethral stump to prevent urinary incontinence
Author(s) -
Kadono Yoshifumi,
Nohara Takahiro,
Kawaguchi Shohei,
Naito Renato,
Urata Satoko,
Nakashima Kazufumi,
Iijima Masashi,
Shigehara Kazuyoshi,
Izumi Kouji,
Gabata Toshifumi,
Mizokami Atsushi
Publication year - 2018
Publication title -
bju international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.773
H-Index - 148
eISSN - 1464-410X
pISSN - 1464-4096
DOI - 10.1111/bju.14181
Subject(s) - medicine , urinary continence , urinary incontinence , urology , urethra , urethral sphincter , sphincter , prostatectomy , urinary system , surgery , prostate , anatomy , cancer
Objective To assess the chronological changes in urinary incontinence and urethral function before and after radical prostatectomy ( RP ), and to compare the findings of pelvic magnetic resonance imaging ( MRI ) before and after RP to evaluate the anatomical changes. Patients and Methods In total, 185 patients were evaluated with regard to the position of the distal end of the membranous urethra ( DMU ) on a mid‐sagittal MRI slice and urethral sphincter function using the urethral pressure profilometry. The patients also underwent an abdominal leak point pressure test before RP and at 10 days and 12 months after RP . The results were then compared with the chronological changes in urinary incontinence. Results The MRI results showed that the DMU shifted proximally to an average distance of 4 mm at 10 days after RP and returned to the preoperative position at 12 months after RP . Urethral sphincter function also worsened 10 days after RP , with recovery after 12 months. The residual length of the urethral stump and urinary incontinence were significantly associated with the migration length of the DMU at 10 days after RP . The residual length of the urethral stump was a significant predictor of urinary incontinence after RP . Conclusion This is the first study to elucidate that the slight vertical repositioning of the membranous urethra after RP causes chronological changes in urinary incontinence. A long urethral residual stump reduces urinary incontinence after RP .