[Electrosurgical concepts in ENT medicine. History, fundamentals and practice].

The beneficial use of heat in the context of medical treatments was documented even in ancient times. The development of high-frequency alternating current generators led to actual electrosurgery, in which primary heating of the tissue takes place. In day-to-day clinical practice electrosurgery is used for coagulation and for electrotomies. There are both unipolar and bipolar techniques for these procedures. When a unipolar technique is used the active electrode is in the tip of the instrument and the patient plate is usually affixed to the patient's skin at a site outside the operating field. The bipolar technique differs in that there are no electrodes that need to be attached externally; both poles are contained inside the operating instrument, e.g. in the two prongs of a forceps. In radiofrequency surgery high-frequency electrical energy is applied directly into the tissue by a unipolar or bipolar technique. In this way it is possible to cause interstitial tissue lesions while sparing the superficial mucous membranes.