Novel interdisciplinary intervention, GAIN, vs. enhanced usual care to reduce high levels of post-concussion symptoms in adolescents and young adults 2–6 months post-injury: A randomised trial

BACKGROUND: Evidence for effective interventions to prevent long-term sequelae after concussion is sparse. This study aimed to test the efficacy of Get going After concussIoN (GAIN), an interdisciplinary, individually-tailored intervention of 8 weeks duration based on gradual return to activities and principles from cognitive behavioural therapy. METHODS: We conducted an open-label, parallel-group randomised trial in a hospital setting in Central Denmark Region. Participants were 15–30-year-old patients with high levels of post-concussion symptoms (PCS) 2–6 months post-concussion (i.e., a score ≥20 on the Rivermead Post-concussion Symptoms Questionnaire (RPQ)). They were randomly assigned (1:1) to either enhanced usual care (EUC) or GAIN+EUC. Masking of participants and therapists was not possible. The primary outcome was change in RPQ-score from baseline to 3-month FU. All analyses were done on an intention-to-treat basis using linear mixed-effects models. This trial is registered with ClinicalTrials.gov, number NCT02337101. FINDINGS: Between March 1, 2015, and September 1, 2017, we included 112 patients. Patients allocated to GAIN+EUC (n=57) reported a significantly larger reduction of PCS than patients allocated to EUC (n=55) with a mean adjusted difference in improvement of 7·6 points (95% confidence interval (CI) 2·0–13·1, p=0·008), Cohen's d=0·5 (95% CI 0·1–0·9). Number needed to treat for prevention of one additional patient with RPQ ≥20 at 3-month FU was 3·6 (95% CI 2·2–11·3). No adverse events were observed. INTERPRETATION: Compared with EUC, GAIN+EUC was associated with a larger reduction of post-concussion symptoms at 3-month FU. FUNDING: Central Denmark Region and the foundation “Public Health in Central Denmark Region - a collaboration between municipalities and the region”.