Kellett, S., Gausden, J. and Gaskell, C. (2021) The effectiveness of cognitive analytic therapy for borderline personality disorder : utilizing a withdrawal experimental design to improve sensitivity to abandonment. Psychology and Psychotherapy: Theory, Research and Practice, 94 (S1). pp. 96-119. ISSN 1476-0835
Abstract
Objectives
A primary methodological weakness of the single‐case experimental design (SCED) outcome studies conducted of the treatment of personality disorder with cognitive analytic therapy (CAT) is that they have failed to employ a withdrawal phase or cross‐over design and so are deemed quasi‐experimental. This study sought to implement a withdrawal design, in order to improve the internal validity of the study to make it a true SCED, and also in order to enable the patient to explore abandonment dynamics.
Design
The study employed an A1/B1/A2/B2 with extended follow‐up SCED with a female patient treated with CAT meeting diagnostic criteria for borderline personality disorder (BPD). Following the 6‐week baseline period ‘A1’, treatment occurred in two phases (21 sessions ‘B1’ and 24 sessions ‘B2’) sandwiching a 12‐week treatment withdrawal phase (‘A2’) and a 24‐week structured follow‐up phase. Seven idiographic daily measures were collected that created a N = 698 day timeline. Nomothetic outcome measures were collected at baseline and at the end of each phase of the study, and the Session Impact Scale was completed after each treatment session.
Results
There was a significant increase in the task focus of treatment sessions. Ideographically, CAT was an effective treatment for improving the participant’s self‐to‐self relationship, as their self‐hate reduced and their sense‐of‐self increased. There was a broad pattern of deterioration during the second treatment phase (B2) and follow‐up phase across the ideographic measures, and CAT was ineffective for BPD ideographic emotional or self‐to‐other measures. Reliable change occurred on the primary BPD nomothetic outcome measure from baseline to end of first treatment phase.
Conclusions
The study suggests that the CAT intervention was partially successful and that it is possible to integrate good research practice with clinical innovation. The methodological strengths and limitations of the design and the clinical implications of the results are discussed.
Practitioner points
Cognitive analytic therapy was partially effective in the treatment of BPD in a case that had been unresponsive to other psychological interventions.
Therapists need to complete lengthy and structured follow‐up to capture any emerging relapse.
Therapists need to discuss the patient’s thoughts and feelings about termination regularly in a relationally informed manner.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | CAT; borderline personality disorder; single case |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Psychology (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 22 May 2020 08:03 |
Last Modified: | 18 Nov 2021 14:02 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1111/papt.12278 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:161049 |