An electrotherapy system, particularly an implantable heart stimulator, is configured as an electronic implant for electrical anti-tachycardia therapy of the heart, and includes at least one programmable therapy sequence (i.e. a sequence of several therapies that are delivered, one after the other, to treat a VT/VF episode). The implant has a therapy success memory for storing therapy success statistics for each therapy, as well as a therapy control unit that is configured to automatically undertake adaptation of the order of the therapies within a therapy sequence as a function of currently stored therapy success statistics.
