[Role of the unstable bladder in certain pathologies of the lower urinary tract].

The authors report their experience of 57 cases of unstable bladder, 20 cases of which were neurogenic in origin. It is a frequent disease encountered in 19% of cases. The sex ratio is one male/one female. Infants are not spared (17 cases). Unstable bladder is a urodynamic concept; therefore, diagnosis of certitude is based on cystometry. The analytic study enables the authors to underline the clinical symptoms, to establish the urodynamic criteria of detrusor hyperactivity and to enumerate the side effects on bladder and renal function. The different etiologies, organic or functional, of detrusor hyperreflexia are exposed. Finally, the therapeutic possibilities are discussed.