Figure 2.

Detrusor pressure in response to electrical stimulation (bar) of the urethra. Electrical stimulation (via contact #2) of the proximal portion of the prostatic urethra evoked a bladder contraction when the bladder was filled to at least 70% of V_th (A and C), but did not evoke a contraction when the bladder was filled to 50% of V_th (B). The contractions in A and C emptied approximately 30 and 60% of the initial bladder volumes around the inflated balloon and urethral catheter, leaving post-void residual volumes of approximately 55 and 30 ml, respectively. These data are from case 1.