Effects of intravesically administered anticholinergics, beta-adrenergic stimulant and alpha-adrenergic blocker on bladder function in unanesthetized rats.

Comparative analysis of the effects of intravesical instillation of drugs on urodynamic parameters (MVP, maximum intravesical pressure; RR, residual rate; BC, bladder capacity) was performed using an experimental model in unanesthetized rats. The drugs investigated in this study were atropine (7.2 x 10(-4)-7.2 x 10(-2) M), propantheline (7.2 x 10(-3)-2.2 x 10(-2) M), oxybutynin (2.5 x 10(-3)-2.5 x 10(-2) M), isoproterenol (5 x 10(-2)-10(-1) M) and prazosin (5 x 10(-4) M). Of the anticholinergics, propantheline and oxybutynin showed a remarkable suppression of MVP accompanied with a consistent increase of RR and BC in a dose-dependent manner. Atropine showed, however, no suppression of MVP in spite of a significant change of RR and BC. Isoproterenol suppressed MVP with an increase of RR and BC in a dose-dependent manner at a relatively high concentration. Prazosin increased BC and RR at a relatively low concentration. This study revealed that these intravesical drugs have the ability to suppress spontaneous bladder contraction in unanesthetized rats and to change the micturition function in the urinary filling and storage phases. It is expected that intravesical instillation therapy for detrusor hyperreflexia will be improved in the future based upon the data obtained.