The present invention relates to an electrode arrangement, preferably for the temporary Stimulation or defibrillation of the heart, consisting of at least one unipolar electrode (cathode) (6), which is fixed at the myocardium of the heart, and an indifferent electrode (2a, 2b) which is fixed at the inner wall of the thorax via its supply line and is positioned such that a direct contact to the heart is prevented.
