Using Cognitive Analytic Therapy as a Transdiagnostic Intervention for Comorbid Personality Disorder, Posttraumatic Stress Disorder, and Functional Neurological Symptom Disorder: A Case Report of a 68 Woman’s Journey Toward the Integration of Dissociated Self-States

Functional neurological symptom disorder (FND) is associated with complex specialist investigations and poor prognosis. The theoretical understanding of FND posits that functional symptoms are predisposed by both psychological factors, including attachment disturbances and childhood trauma, and biological factors such as neuroplasticity and epigenetics. Current treatment recommendations include psychological therapy, with moderate effects observed with cognitive-behavioural therapy and psychodynamic therapy modalities, however, psychological understanding is key to success. The current case report describes cognitive analytic therapy (CAT) with a 68 year-old woman presenting to services with diagnoses of FND and borderline personality disorder (BPD). The target problem for therapy was integration of fragmented self-states (dissociative and driven) pertinent to both FND and BPD. 16 session CAT was delivered, with four follow up sessions, exploring unhelpful patterns of relating with self and others, based on an unconscious repertoire of internalised patterns and procedures from early life. CAT tools were used to facilitate change; reformulation and ending letters, mapping and the therapeutic relationship. Scores on the personality structure questionnaire (PSQ) and an idiosyncratic measure of state-shifting indicated positive outcomes, sustained at 3 month follow up. This shows modest early acceptability and feasibility of CAT for working with comorbid BPD and FND, providing a validating and blame free formulation of the development and maintenance of symptoms. Additional measures would have improved the ability to comment on the effectiveness of the treatment and future research implications are discussed.