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SO039

Smartphone-based self-help Flash Technique for trauma-related symptoms: a pilot controlled study evaluating safety and efficacy

SMARTPHONE-BASED SELF-HELP FLASH TECHNIQUE FOR TRAUMATIC SYMPTOMS: A PILOT CONTROLLED TRIAL EVALUATING SAFETY AND EFFICACY

The Flash Technique app used without therapist guidance caused no serious adverse events in a single session and showed a clinically notable reduction in anxiety, but between-group differences were not statistically significant and the attrition rate was high.

The study evaluates the safety, feasibility, and efficacy of the Flash Technique, an EMDR-derived technique that does not require intensive exposure, when delivered through an unguided smartphone app. Of 56 applicants with a history of trauma, 17 were included in the analysis (app n=8, video control n=9). The study was a single-session, randomized, active-controlled pilot trial; the control group watched a structured psychoeducational video lasting approximately 45 minutes, and pre- and post-intervention assessments were conducted using the DASS-21 and IES-R. No serious adverse events, dissociation, panic, or crises were reported in the app group; the attrition rate was 69.6%, consistent with the 68% reported in a comparable app-based study. The DASS-21 anxiety score decreased from 6.62 to 4.37 in the app arm, while increasing from 4.44 to 4.55 in the control arm. Rounded mean total DASS-21 scores decreased from 17 to 16 in the video arm and from 22 to 17 in the app arm; IES-R scores decreased from 35 to 26 in the video arm and from 31 to 23 in the app arm. None of the group × time effects were significant: DASS-21 anxiety p=0.153, effect size η²=0.131; DASS-21 depression p=0.462, η²=0.037; DASS-21 total p=0.252, η²=0.086; IES-R total p=0.835, η²=0.003. The sample had chronic symptoms, with a mean time since the event exceeding 120 months. The authors state that the app appears safe in the short term when used without guidance, that the lack of statistical significance is largely related to the small sample size, and that larger controlled studies with sample sizes determined by power analyses are needed to establish efficacy.

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