[Electromyography of the sphincter vesicae externus muscle. Technique, indications and outcome]

Electrophysiological examinations provide important findings for the clarification of urogenital dysfunctions. A routine electromyogram (EMG) of the external anal sphincter is used together with stimulation of the pudendal nerve to determine lesions of the somatomotor tract. An alternative is the electromyographical examination of the external vesical sphincter. This special method requires more time and sufficient experience. We see an indication for EMG of the voluntary vesical sphincter in urogenital dysfunctions that cannot be sufficiently differentiated with EMG of the external anal sphincter and also in disturbances that selectively affect the external vesical sphincter.