Some observations on a condition of relatively lower detrusor contractility in stable versus unstable unobstructed...

The study comprised 30 consecutive benign prostatic hypertrophy patients--15 with detrusor instability, and 15 with stable bladders--who had a relatively lower detrusor contractility with no obvious obstruction of the vesical outlet. Compared with the stable bladders, those with detrusor instability showed lower filling volumes, along with a relatively greater voiding efficiency and relatively higher values of detrusor contraction strength and contraction velocity. Micturition contractions proved to be more well sustained until the end of voiding in the unstable group. It has been assumed that the factors responsible for detrusor instability also caused bladder contractile capability to relatively increase. In other words, it seemed even this extreme case could possibly support the view that detrusor instability always involves a tendency to enhanced contractile function.