The Different Mechanisms of Awake Micturitions between Male and Female Rats Using an Overactive Model with Intravesical PGE2 Instillation / 대한비뇨기과학회지

PURPOSE: We wanted to obtain informations on the different mechanisms of awake micturitions between male and female rats by using an overactive model with intravesical PGE2 instillation. MATERIALS AND METHODS: Sprague Dawley rats(6 male, 6 female) were used. A catheter was implanted into the bladder to record the intravesical pressure. Three days later, the awake cystometry was performed, and PGE2 was given intravesically to induce detrusor overactivity(DO). With using the conventional pressure and volume parameters, a new parameter of flow pressure was investigated. RESULTS: When recorded as the flow pressure, the male rats exhibited higher urethral resistance than did the female rats in the normal state. The male rats showed higher urethral resistances after DO was induced, than those before the DO. However, the female rats did not show increased urethral resistance after DO was induced. CONCLUSIONS: An increase in urethral resistance through the outlet region was induced in male rats after intravesical PGE2 instillation, but this didn't occur in female rats. This result indicates that overactive bladder has different mechanisms and responses in different genders.

The Efficacy of Transurethral Resection of Prostate in Patients with Large Prostate (over 100 g): Comparison with Open Prostatectomy

PURPOSE: We performed transurethral resection of prostate(TURP) in benign prostatic hyperplasia(BPH) patients with large prostate greater than 100 g and evaluated the efficacy of TURP compared with open prostatectomy. MATERIALS AND METHODS: From June 1998 to January 2006, all 26 patients with symptomatic BPH patients with large prostate greater than 100 g were entered into the study. 7 patients underwent open prostatectomy (open group) and the other 19 patients underwent TURP(TURP group). The pre-operative evaluation included International Prostate Symptom Score(IPSS), quality of life(QoL), peak urinary flow rate(Qmax), satisfaction index and transrectal ultrasonography, operation time, weight of resected tissue, postoperative hospital stay and complications were noted. RESULTS: Between two groups there were no statistically significant differences in pre-operative data. In open group resected tissue was larger than TURP group, however, hospital stay and operation time were longer, and operation-related complications happened more frequently than TURP group. There were no statistically significant differences in postoperative IPSS, QoL, Qmax and satisfaction index between the two groups. CONCLUSION: Compared with open prostatectomy, TURP can be safely performed for treating symptomatic BPH greater than 100 g in size.