In 12 of 23 patients with atrial flutter, who were cardioversed by means of electric stimulation techniques and underwent a regular after-examination, a sinus rhythm was still existing 24 months after regularization. When these long-term results which in comparison to the late results are more favourable after electroshock cardioversion are interpreted apart from the different selection of patients must be taken into consideration that the rate of immediate success of about 50% was distinctly lower than in the DC-shock cardioversion. It is to be supposed that a stimulation therapy only in those patients leads to regularization, the atrial vulnerability and recidivity of whom is less distinct, whereas in the other cases only the transgression into an atrial fibrillation is successful.