Study The Application Of Urodynamics For The Wallstent In The Treatment Of Prostatic Diseases With BOO

To evaluate the value of the urodynamics in the bladder outlet obstruction (BOO) treated with wallstent, to probe the shifty orderliness of stent and posterior urethral before and after the stent implantation , in order to increase the accuracy of stent implantation . We chose 35 old patients with urinary retention caused by benign prostatic hyperplasia (BPH) or prostatic cancer (Pca) , they couldn't bear the open operation or TURP because of the other diseases . Urodynamics performed before and after the wallstent implantation . Results: All the patients had BOO and were fit for implanting wallstent, the function of bladder detrusor was normal or hyper in 24 patients ; the function of bladder detrusor was acontractile in 11 patients .The length of posterior urethral measured by the urethral pressure was 5.36±0.9lem before implantation , the length of wallstent we choosed was 3.33 ±0.66cm . The length of posterior urethral was 5.97±0.97cm after implantation , the length of wallstent was changed to 4.14 ± 0.74 cm , they all prolonged after the treatment . the length of stent to outer urethral constrictor was 2.00 ± 0.80cm after satisfied implantation .The correct rate of choosing stent was 80.1% according to the length of prostate measured by transrectal ultrasound , the correct rate was 97.3% when we combined with urethral pressure . conclusion : Urodynamics could tell us the stent implanted indication , could improve the correctness of choosing stent;After implantation , urodynamics could determine the stent location in the posterior urethral, we could understand the shifty orderliness of stent and posterior urethral, and we also knew the reason why we were fail in stent treatment.