Efficacy of internet-delivered acceptance and commitment therapy for severe health anxiety: results from a randomized, controlled trial.

BACKGROUND: Health anxiety is common, disabling and costly due to patients' extensive use of health care services. Internet-delivered treatment may overcome barriers of accessibility to specialized treatment. We aimed to evaluate the efficacy of internet-delivered acceptance and commitment therapy (iACT). METHODS: A randomized, controlled trial of iACT versus an internet-delivered discussion forum (iFORUM), performed in a Danish university hospital setting. Patients self-referred and underwent video-diagnostic assessment. Eligible patients (≥18 years) with health anxiety were randomized to 12 weeks of intervention. The randomization was blinded for the assessor. The primary outcome was between-group unadjusted mean differences in health anxiety symptoms measured by the Whiteley-7 Index (WI-7, range 0-100) from baseline to 6-month follow-up (6-MFU) using intention to treat and a linear mixed model. The study is registered at clinicaltrials.gov, number NCT02735434. RESULTS: A total of 151 patients self-referred, and 101 patients were randomized to iACT (n = 53) or iFORUM (n = 48). A mean difference in change over time of 19.0 points [95% confidence interval (CI) 10.8-27.2, p < 0.001] was shown on the WI-7, and a large standardized effect size of d = 0.80 (95% CI 0.38-1.23) at 6-MFU. The number needed to treat was 2.8 (95% CI 1.8-6.1, p < 0.001), and twice as many patients in iACT were no longer clinical cases (35% v. 16%; risk ratio 2.17, 95% CI 1.00-4.70, p = 0.050). Adverse events were few and insignificant. CONCLUSIONS: iACT for health anxiety led to sustained effects at 6-MFU. The study contributes to the development of easily accessible treatment options and deserves wider application.

Accuracy of self-referral in health anxiety: comparison of patients self-referring to internet-delivered treatment versus patients clinician-referred to face-to-face treatment.

BACKGROUND: Severe health anxiety is a chronic and costly disorder if untreated. Patient self-referral may lower barriers to treatment and decrease diagnostic delay. AIMS: This study evaluated the accuracy of self-referral for severe health anxiety and compared characteristics of patients self-referred to internet-delivered treatment with patients referred by a clinician to face-to-face treatment. METHOD: Two trials in the same clinic employed different referral methods for health anxiety, namely self-referral and clinician-referral (trial registration: clinicaltrials.gov: NCT01158430 and NCT02735434). The trials were conducted at different time points but with largely comparable eligibility criteria. The accuracy of the recruitment methods was compared by looking at the number of eligible patients in the two trials. Patients completed a baseline questionnaire and subsequently underwent a diagnostic interview by experienced clinicians. Mean differences in self-report and clinical data explored between-group demographic and clinical characteristics. RESULTS: In total, 101/151 (67%) self-referred patients were eligible compared with 126/254 (50%) clinician-referred patients (P = 0.001). Self-referred patients were 3.4 years older (P = 0.008) and had a somewhat higher educational level (P = 0.030). Patients who self-referred reported significantly higher levels of health anxiety, emotional distress and somatic symptoms compared with clinician-referred patients. Yet, they had less clinician-assessed comorbid anxiety disorders (P<0.001) and better physical health-related quality of life (P<0.001) suggesting a more distinct symptom profile. CONCLUSIONS: Self-referral was found to be an accurate method to recruit highly relevant patients with treatment-demanding health anxiety. Thus, both self-referral and clinician-referral seem feasible and valid referral methods, but they may recruit patients with slightly different characteristics. DECLARATION OF INTEREST: None.

Development and Feasibility Testing of Internet-Delivered Acceptance and Commitment Therapy for Severe Health Anxiety: Pilot Study.

BACKGROUND: Severe health anxiety (hypochondriasis), or illness anxiety disorder according to the Diagnostic and Statistical Manual of Mental Disorders, 5th edition, is characterized by preoccupation with fear of suffering from a serious illness in spite of medical reassurance. It is a debilitating, prevalent disorder associated with increased health care utilization. Still, there is a lack of easily accessible specialized treatment for severe health anxiety. OBJECTIVE: The aims of this paper were to (1) describe the development and setup of a new internet-delivered acceptance and commitment therapy (iACT) program for patients with severe health anxiety using self-referral and a video-based assessment; and (2) examine the feasibility and potential clinical efficacy of iACT for severe health anxiety. METHODS: Self-referred patients (N=15) with severe health anxiety were diagnostically assessed by a video-based interview. They received 7 sessions of clinician-supported iACT comprising self-help texts, video clips, audio files, and worksheets over 12 weeks. Self-report questionnaires were obtained at baseline, post-treatment, and at 3-month follow-up. The primary outcome was Whiteley-7 Index (WI-7) measuring health anxiety severity. Depressive symptoms, health-related quality of life (HRQoL), life satisfaction, and psychological flexibility were also assessed. A within-group design was employed. Means, standard deviations, and effect sizes using the standardized response mean (SRM) were estimated. Post-treatment interviews were conducted to evaluate the patient experience of the usability and acceptability of the treatment setup and program. RESULTS: The self-referral and video-based assessments were well received. Most patients (12/15, 80%) completed the treatment, and only 1 (1/15, 7%) dropped out. Post-treatment (14/15, 93%) and 3-month follow-up (12/15, 80%) data were available for almost all patients. Paired t tests showed significant improvements on all outcome measures both at post-treatment and 3-month follow-up, except on one physical component subscale of HRQoL. Health anxiety symptoms decreased with 33.9 points at 3-month follow-up (95% CI 13.6-54.3, t11= 3.66, P=.004) with a large within-group effect size of 1.06 as measured by the SRM. CONCLUSIONS: Treatment adherence and potential efficacy suggest that iACT may be a feasible treatment for health anxiety. The uncontrolled design and small sample size of the study limited the robustness of the findings. Therefore, the findings should be replicated in a randomized controlled trial. Potentially, iACT may increase availability and accessibility of specialized treatment for health anxiety. TRIAL REGISTRATION: Danish Data Protection Agency, Central Denmark Region: 1-16-02-427-14; https://www.rm.dk/sundhed/faginfo/forskning/datatilsynet/ (Archived by Webcite at http://www.webcitation.org/6yDA7WovM).

Intervening variables in group-based acceptance & commitment therapy for severe health anxiety.

OBJECTIVE: The present study is based on a previously reported successful randomized controlled trial (RCT) on Acceptance and Commitment Group therapy (ACT-G) for severe health anxiety (HA) and investigates intervening variables of ACT for HA. The process primarily targeted by ACT is psychological flexibility (PF). No randomized study has yet examined the possible intervening variables of ACT for HA. METHODS: 126 patients diagnosed with severe HA were enrolled in the RCT of which 107 were included in the analyses. The outcome measure was illness worry (Whiteley Index) and included process variables were PF and facets of mindfulness. RESULTS: Statistically significant indirect effects (IE) of ACT-G on the outcome of illness worry 6 months after treatment were found for PF (IE = -5.5, BCa 99% CI -12.3;-1.2) and one mindfulness subscale, namely 'non-react' (IE = -6.5 BCa 99% CI -15.3: 1.0). CONCLUSION: In line with the ACT model of change, PF may have a small to moderate IE on decrease in illness worry. Of the mindfulness scales, only 'non-react' showed a significant IE. Although tentative, due to no active comparison control condition, these results support that PF is a intervening variable in ACT treatment aimed at reducing illness worry in patients with severe HA.