Can Exposure Therapy Be Effective for Persistent Post-Concussion Symptoms? A Nonconcurrent Multiple Baseline Design Across 4 Cases

Objective: After a concussion, some patients develop persistent post-concussion symptoms, which interferes with functioning in daily life. A biopsychosocial explanation for the development and continuation of persistent post-concussion symptoms is the fear avoidance model (FAM). This study aimed to investigate the effectiveness and feasibility of an individual 14-week exposure therapy for patients with persistent symptoms after concussion. Participants: Four participants from a medical psychology outpatient clinic participated in the study. Their age ranged between 51 and 68 years old (M = 62.8, SD = 7). The average length of time since the concussion was 10 months. Design: A single-case experimental design (SCED) with nonconcurrent multiple baselines was used. Participants were randomly assigned to a baseline period (A phase) length between 21 and 42 days. The intervention phase (B phase) consisted of 14 treatment sessions in 14 weeks. The follow-up phase was 12 weeks. Main Measures: Participants answered questions on a visual analogue scale about their satisfaction with functioning in daily life, avoidance behavior, and symptoms experience on a daily basis during baseline and on a weekly basis during intervention and follow-up. Additional outcomes included symptom severity, catastrophizing, quality of life, participation, avoidance behavior, and feasibility interviews. Results: Tau-U yielded significant effects (P <.05) on all measures when comparing intervention and follow-up with the baseline in 3 out of 4 participants. Satisfaction with daily life increased and avoidance behavior and post-concussion symptoms experienced decreased. Participants and therapists rated the intervention protocol with an average of 8.8 out of 10. Conclusion: The findings suggest that exposure therapy seems effective and feasible in treating patients with persistent symptoms after concussion in a clinical setting. Larger randomized controlled trials or replication with SCED studies are advised to obtain additional evidence on the effectiveness of exposure for individuals with persistent symptoms after concussion.