The Beneficial Effect of Korean Red Ginseng on Rat Bladder Contractility and Oxidant Damage Following Ischemia/Reperfusion

PURPOSE: N-acetylcysteine (NAC) is a potent antioxidant, and a free radical scavenger. We investigated the possible effects of NAC after ischemia/reperfusion (I/R) of rat bladder. MATERIALS AND METHODS: I/R injury was induced by abdominal aorta clamping and ischemia for 60minutes, followed by 120minutes reperfusion. Twenty rats were divided into four groups: sham operation + saline group (S+S), sham operation + NAC group (S+NAC), I/R + saline group (I/R+S), I/R + NAC group (I/R+NAC). Blood levels of reactive oxygen species (ROS) were determined using the free oxygen radical tests (FORT). Superoxide generation was measured based on lucigenin-enhanced chemiluminescence. The level of malondialdehyde (MDA) was analyzed in order to measure lipid peroxidation. RESULTS: In I/R+S group, the isometric contractile responses to carbachol were significant lower than other groups and were reversed by the pretreatment with NAC. The level of FORT and MDA showed a marked increase in I/R+S group compared with S+S group. NADPH-stimulated superoxide production was also significantly increased. I/R+NAC decreased these parameters compared with I/R+S group. CONCLUSION: Our results suggest that treatment with NAC reversed the low contractile responses of rat bladder and prevented oxidative stress following I/R.

The Evaluation of a Dissolvable Ureteral Catheter in a Rabbit Model / 대한비뇨기과학회지

PROPOSE: Ureteral stents are commonly placed after routine ureteroscopic procedures to prevent acute obstruction. However, stents can cause significant symptoms and they can require a secondary procedure for removal; further, they may possibly be forgotten. In order to overcome these problems, a temporary ureteral drainage stent capable of dissolving spontaneously was developed to evaluate the tissue reaction and toxicity. MATERIALS AND METHODS: We developed a dissolvable ureteral catheter composed of polydioxanone (PDO). We evaluated the toxicity and tissue reaction by hematologic (CBC, aminotransferase/alanine transaminase (AST/ALT), blood urea nitrogen, creatinine (BUN, Cr), alkaline phosphatase) and histologic examination (ureter, kidney and liver tissue). Twelve rabbits were placed into groups of four rabbits each: the uninserted control group, group I that had a dissolvable ureteral catheter inserted with harvest at four weeks, group II that had a dissolvable ureteral catheter inserted with harvest at eight weeks, and group III that had a dissolvable ureteral catheter inserted with harvest at twelve weeks. RESULTS: On histologic examination, the ureter had a normal appearance of transitional cells and it contained the dissolvable ureteral catheter in the ureteral lumen without any inflammatory change. The ureteral surface cells appeared normal after contact with the dissolvable ureteral catheter during the 12 weeks. Liver and kidney tissue showed mild focal inflammatory change, but no definitive difference was noted between the control and groups I, II and III. On the hematologic examination, there was no significant change of the value of CBC, AST/ALT, BUN, Cr and alkaline phosphatase due to the inserted dissolvable ureteral catheter during the 12 weeks. CONCLUSIONS: A dissolvable ureteral catheter appeared to have no toxic effect, as evidenced by histological and hematological examination. However, further study is warranted in order to overcome the catheter's limitations like for its flexibility.

Management of Voiding Dysfunction after Surgical Treatment of Female Stress Urinary Incontinence

PURPOSE: We studied the voiding dysfunction after surgical treatment of female stress urinary incontinence and diagnosis and treatment. MATERIALS AND METHODS: Three hundred women with stress urinary incontinence underwent surgical procedure between January 1998 and December 2004. Ninety two patients(30.6%) experienced the postoperative voiding dysfunction. As the primary procedure for the management of postoperative voiding dysfunction alpha-blockers medication and clean intermittent catheterization(CIC) were performed. Then, hegar dilation and urethral pull-down procedure were performed as a secondary measure. For the patients who showed persistent obstructed symptoms, cutting of mesh or sling materials were performed. RESULTS: In 57 patients, symptoms improved by alpha-blockers medication and CIC. The others were received hegar dilation and urethral pull-down procedure, and 29 patients were improved. 6 patients were not controlled by conservative treatment, of which 3 patients underwent cutting of mesh or sling. De novo urgency was developed in 12 patients. Anticholinergics were taken, symptoms were diminished in 10 patients after 5 months of medication. CONCLUSION: Most voiding dysfunction after surgery may be effectively managed by conservative treatment. In cases of failure, hegar dilation and urethral pull-down procedure may be useful within postoperative first weak. Finally, cutting of mesh or sling must be considered in patient whose the secondary measure is failed.

Randomized Prospective Study between Pubovaginal Sling Using SPARC Sling System and MONARC Sling System for the Treatment of Female Stress Urinary Incontinence: Short Term Results / 대한비뇨기과학회지

PURPOSE: A variety of retropubic and transobturator surgical techniques have been developed to restore support of the urethral sphincteric apparatus, but there is no consensus on the best procedure. The safety and efficacy of the SPARC (SPARC sling system, suprapubic arc, American Medical System) and the MONARC (MONARC subfascial hammock, American Medical System) sling systems for the treatment of female stress incontinence were evaluated in a prospective randomized trial. MATERIALS AND METHODS: Forty three women with stress incontinence were randomly assigned to the SPARC (n=22), or MONARC sling (n=21) procedures, between December 2003 and July 2004. The operative techniques complied with the manufacturers instructions. The patient characteristics and urodynamic evaluations were similar in both groups. The preoperative evaluation included a careful history taking, physical examination, voiding diary, stress & pad test and a comprehensive urodynamic examination. The postoperative evaluation included a questionnaire, stress & pad test and uroflowmetry with postvoid residuals. RESULTS: The mean operative time was shorter in the MONARC group, but this difference was not significant (23 min vs. 26 min). No bladder injury occurred in the MONARC group, versus 4.5% (n=1) in the SPARC group. The rate of postoperative urethral obstruction, including retention, was 27.2% (n=6) in the SPARC group, versus 28.5% (n=6) in the MONARC group, but this was improved by conservative therapy. The rates of cure (81.8% vs. 80.9%), improvement (18.2% vs. 19.1%) and failure (0% vs. 0%) were similar in the SPARC and MONARC groups, respectively. CONCLUSIONS: The MONARC procedure appears to be equally efficient as the SPARC procedure for the surgical treatment of stress urinary incontinence in women over a short-term follow-up. Although further studies are needed to establish its long-term efficacy and safety, the SPARC and MONARC procedures might be attractive alternative tools for the treatment of female stress urinary incontinence.