The invention relates to a system (1) for evaluating an efficacy of vagus nerve stimulation, wherein the system (1) comprises a neurostimulator (2) that is configured to perform vagus nerve stimulation, and a measuring means (3) for evaluating said efficacy based on at least one parameter (Z) that is indicative of a myocardial contractile state of the heart (H). Furthermore, the invention relates to a corresponding method.
