[Electroresection at the apex of the prostate gland: aid for orientation by faradic stimulation of the external sphincter muscle (author's transl)].

The localization of the external sphincter muscle can be very well demonstrated by its contractions, which can be produced by transurethral faradic electrostimulation. We present a simple and safe method of stimulating the sphincter muscle if wished during TUR or for diagnostic reasons. This exact orientation-aid, which is simultaneously a function test, is more precise than the known "sphincter signs".