RESUMEN
Psychological First Aid (PFA) is known to be an initial early intervention following traumatic exposure, yet little is known about its optimal implementation and effectiveness. This review aims to examine the evidence for the effectiveness of PFA interventions and how PFA interventions have been designed, implemented, and experienced. MEDLINE, the Cumulative Index to Nursing and Allied Health Literature (CINAHL), Cochrane Library, PsychINFO, Embase, Web of Science, PILOTS, and China National Knowledge Infrastructure (in Chinese) databases were searched. Twenty studies from 4,735 records were included and quality rated, followed by an integrative synthesis of quantitative and qualitative evidence. PFA intervention following trauma exposure shows a positive effect for reducing anxiety and facilitating adaptive functioning in the immediate and intermediate term, yet the evidence for reducing Post-traumatic stress disorder/depressive symptoms is less compelling. Furthermore, commonalities in the components and techniques across different PFA approaches identified tend to align with four of Hobfoll's five essential elements: safety, calm, efficacy, and connectedness (as reflected among 7/11 PFA protocols), whereas the "hope" element was less developed. These commonalities include active listening, relaxation/stabilization, problem-solving/practical assistance, and social connection/referral. Intensive techniques such as cognitive reconstruction have also been incorporated, intensifying PFA delivery. The substantial variation observed in PFA format, timing, and duration, coupled with inadequate documentation of fidelity of implementation and adaptation, further constrains the ability to inform best practices for PFA. This is concerning for lay frontline providers, vital in early trauma response, who report implementation challenges despite valuing PFA as a time-sensitive, supportive, and practical approach.
