Effects of the Transcranial Stimulation on Prevention of Cognitive Dysfunction in Cardiac Surgery

Application of two daily sessions of cerebral stimulation starting from the first day after de surgery, for 4 consecutive days, with each session having 20 minutes, having an 8 hour minimum break between them. Will be applied a direct current stimulus of 2 milliampere (mA) (right anode/left cathode) in the prefrontal right region.