The Effectiveness of a Brief Early Intervention of Acute Stress Syndrome Stabilization Protocol for Victims of Sexual Violence (ASSYST-SV).

Sexual violence is associated with a high risk of developing post-traumatic stress disorder (PTSD), emotional distress, sleep disturbances, and impairments in daily functioning. Despite these risks, few interventions are tailored to the specific needs of women who have experienced sexual violence, particularly in the acute phase. This study aims to address this gap by adapting the ASSYST protocol-originally developed for trauma-related acute stress-and evaluating its utility in real-world clinical settings.

The ASSYST-VS protocol consists of five 90-minute sessions. The first session focuses on psychoeducation and emotional regulation using trauma-sensitive yoga techniques (YST) to promote safety and establish a therapeutic alliance. Sessions two through five focus on desensitizing the traumatic event using an EMDR-informed version of the ASSYST protocol adapted for this population.

Given the high risk of psychopathology following sexual violence, no control group will be included for ethical reasons. Participants will be recruited from Specialized Intervention Services (SIE) in Catalonia and CAPSEM centers in Madrid. Following informed consent, participants will complete both clinician-administered and self-report assessments measuring PTSD symptoms, anxiety, depression, sleep quality, emotional well-being, and functional capacity. All study procedures will adhere to strict confidentiality protocols and comply with the General Data Protection Regulation (GDPR).

Feasibility will be assessed through adherence and dropout rates, as well as participant satisfaction. The expected sample size (n = 36) is based on previous studies with similar interventions and was calculated using G*Power to ensure adequate statistical power.

Primary outcomes include changes in PTSD symptoms (International Trauma Questionnaire, ITQ), emotional distress (Generalized Anxiety Disorder Scale, GAD-7; Patient Health Questionnaire, PHQ-9), functional impairment (Inadaptation Scale), sleep problems (Pittsburgh Sleep Quality Index, PSQI), and well-being (Warwick-Edinburgh Mental Well-being Scale, WEMWBS). Participant satisfaction will be measured with the Client Satisfaction Questionnaire (CSQ). This project seeks to provide evidence for a scalable, early-phase trauma intervention with high clinical relevance.

Inclusion criteria

• Be a woman aged 18 or older
• Have experienced at least one episode of sexual violence within the past 6 months
• Be currently receiving care from one of the following centers:
• Servei d'Intervenció Especialitzada (SIE) in Garraf-Penedès or Baix Llobregat (Catalonia)
• CAPSEM Norte or CAPSEM Sur (Madrid)
• Present acute post-traumatic stress symptoms (score > 0 on items 3.1 to 3.5 of the Trauma Screening Questionnaire - TSQ)
• Be capable and willing to provide informed consent
• Be fluent in Spanish or Catalan The intervention is offered under the assumption that women seeking support from specialized services are in need of early psychological intervention, and may benefit from a brief trauma-focused approach. This inclusive design seeks to maximize access to care and promote recovery in real-world settings.

Exclusion criteria

• Active substance abuse that would interfere with treatment participation
• Intellectual or cognitive disability that prevents completion of the intervention protocol
• Active suicidal ideation at the time of the intervention
• Inability to communicate in Spanish or Catalan