A multiple-baseline evaluation of acceptance and commitment therapy focused on repetitive negative thinking in panic disorder

Randomized multiple baseline design with 3 participants evaluating an ultra-brief protocol (4 sessions) of RNT-focused ACT for panic disorder, without explicit exposure. After intervention, all three stopped experiencing panic attacks and showed clinically significant changes in DASS-21 and PSWQ; very large effect sizes on emotional and process measures (experiential avoidance, fusion). Promising preliminary results.