Mentalizing Mediates the Association between Narcissism and Psychotherapeutic Treatment Outcome in a Mixed Clinical Sample

Introduction: Pathological narcissism has been a challenge for the success of psychological treatment, whereas mentalizing has turned out to be an important mechanism of change in psychotherapy. This study focused on the classic narcissistic self (CNS) (i.e., narcissistic grandiosity) as predictor of the outcome. It further investigated whether mentalizing mediates this relation. Methods: A mixed clinical sample of 205 patients was investigated. The CNS scale of the Narcissism Inventory and the Mentalization Questionnaire was used to measure the features of narcissistic grandiosity and the capacity to mentalize, respectively. The symptom outcome was assessed with the Hamburg Modules for the Assessment of Psychosocial Health. Results: Contrary to our expectations, we did not find a direct association between narcissistic grandiosity and a decrease in symptoms. However, mentalizing was found to mediate the association between the CNS as well as between the narcissistic furor and outcome. Conclusion: Our results confirm the ambiguity concerning the clinical significance of narcissistic grandiosity. However, in order to improve the treatment outcome in patients with narcissistic features, especially narcissistic furor, individualized treatment plans might consider introducing interventions that enhance the capacity to mentalize.