Effects of a Psychological First Aid (PFA) Based on the SIX Cs Model on Acute Stress Responses in a Simulated Emergency

Objective: The SIX Cs model, a neuropsychological framework for psychological first aid, addresses acute stress responses that may lead to functional failure and heighten the risk for posttraumatic stress disorder. Unlike emotional interventions, this model prioritizes Cognitive Communication to diminish emotional overwhelm and bolster cognitive functioning. It introduces a Challenge for active engagement, Control for cognitive management of situations, Commitment from the helper to reduce loneliness, and Continuity to ensure narrative coherence. This study evaluates the SIX Cs model’s effectiveness in an experimental setup to alleviate acute stress reaction symptoms. Method: Sixty-three participants voluntarily participated. They were randomly assigned to the SIX Cs intervention (experimental) or to supportive emotional expression (control). They listened to a 3-min audio recording of a real emergency 911 phone call. Interventions were provided before and after listening to the recording. Before, immediately after, and 5 min later (recovery), participants’ anxiety, heart rate variability, and mental resilience levels were measured. Results: For all three outcomes, the Time × Group interactions were statistically significant. Follow-up analyses revealed that the SIX Cs participants showed lower anxiety and less reductions in heart rate variability and resilience than controls immediately after the stressor. Furthermore, the SIX Cs participants recovered faster on all three outcomes compared to controls. Conclusions: The results demonstrate the superior effect of the psychological first aid based SIX C’s protocol over control in all outcomes, immediately after a simulated stressor and 7 min later as well as possible contribution for posttraumatic stress disorder risk reduction.