Figure 2.

Detrusor pressure in response to urethral stimulation at different bladder volumes. Electrical stimulation of the distal urethra did not evoke a bladder contraction when the bladder was filled to 50% of V_th (A), but stimulation did evoke a contraction when the bladder was filled to 70% of V_th (B). Stimulus amplitude was 22 mA and frequency was 20 Hz. Bladder contraction generated some voiding, but the voided volume was not recorded. Peak detrusor pressure increase evoked by stimulation was approximately 75 cmH₂O.