Bladder rhythm is an important concept of physiology. Bladder physiology can be described by the classifical organ model, by the urodynamic model and by the neurophysiological model. The organ model deals with the coordinated functions of the smooth muscle in the detrusor and bladder neck, and of the skeletal muscle of the urethra and external sphincter. The urodynamic model describes the bladder capacity, shape, pressure gradients, flow rate and outflow resistance by the armamentarium of a urodynamics laboratory. The neurophysiological model describes the innervation, pathways, and the centers in the spinal cord and brain stem dealing with the control, coordination, integration, onset and cessation of the micturition. Once these concepts are understood, specific urodynamic abnormalities can be suggested from specific features of the patient’s history, physical examination, cystoscopy and intravenous urograms. Urethrovesical coordination is controlled by many reflexes. Continence should be classified and quantitated in order to be rationally treated. The various surgical procedures for the management of incontinence are analyzed in terms of their underlying physiological effects.

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