<prompt> Which of the following statements about detrusor instability is false?50 of men with bladder outflow obstruction have detrusor instabilityPatients with neurogenic bladder may have detrusor instabilityGenuine stress incontinence GSI is indistinguishable from detrusor instabilityUrodynamic studies are essential for evaluation of detrusor instability  <response>: Detrusor instability DI Detrusor instability caused by neurologic diseases such as cerebrovascualr disease, multiple sclerosis, or spinal cord injury is called detrusor hyperreflexia. Irritation of the bladder by inflammation such as urinary tract infection or prior pelvic surgery can also cause detrusor instability. Motor Urge Incontinence Symptomatic presentation is similar to sensory urge incontinence Diagnosis is usually suppoed by urodynamic findings of detrusor constrictions Can be associated with bladder outlet obstruction in men from BPH or anatomic stress incontinence in women. Can be idiopathic Also referred to as Detrusor instability Idiopathic detrusor instability can mimic GSI and may coexist. But they are different conditions that can be properly diagnosed by urodynamic studies. 