RT Journal Article T1 Chronic postsurgical pain in young children: prevalence, pain trajectories and physical and psychological prognostic factors A1 Ceniza-Bordallo, Guillermo A1 Gómez Fraile, Andrés A1 López De Uralde Villanueva, Ibai Julio A1 Rabbitts, Jennifer A. A1 Rui, Li A1 Palermo, Tonya M A1 Martín Casas, Patricia AB Prevalence of chronic postsurgical pain (CPSP) and prognostic factors in older children and adolescents have been identified. However, prevalence and prognostic factors in younger children, which may differ from older children, have been minimally studied. Additionally, a significant knowledge gap exists, with few prospective studies investigating long-term outcomes of CPSP in pediatric populations. To address this, our study investigates CPSP prevalence, prognostic factors, and pain trajectories in 4 to 7-year-olds, aiming to enhance understanding within the 24-month period after surgery. Registered under NCT04735211, the study includes 113 young participants (mean age=5.3 years, 35.4% girls) and their parents recruited from a university hospital in Spain. CPSP prevalence was examined at 3, 6, 12, and 24 months post-surgery. Multiple logistic regression models assessed presurgical predictors (child sex, child age, child's pain intensity, physical health, psychological health, parent pain catastrophizing, fear of pain). Group-based trajectory modeling (GBTM) was used to analyze postsurgical pain trajectories. Results indicate a 35% CPSP prevalence at 3 months, decreasing to 12% at 24 months. Older age (aOR=1.83, 95% CI 1.11-3.03) and higher parent pain catastrophizing (aOR=1.20, 95% CI 1.10-1.31) were associated with CPSP at 3 months. GBTM identified three postsurgical pain trajectories: Low Pain (27.4%), Quick Recovery (53.1%), and Slow Recovery (19.5%). Findings provide novel data in this vulnerable younger age group to help understand prevalence of CPSP, physical and psychological prognostic factors and pain trajectories, which may lead to establishing preventative initiatives. PERSPECTIVE: This study provides valuable insights into the high prevalence of CPSP, with rates of 35% at 3 months decreasing to 12% at 24 months. It identifies both modifiable (e.g., parent pain catastrophizing, pain intensity, physical health) and non-modifiable (e.g., age) risk factors in a minimally studied population. PB Churchill Livingstone SN 1526-5900 YR 2025 FD 2025-09-01 LK https://hdl.handle.net/20.500.14352/124189 UL https://hdl.handle.net/20.500.14352/124189 LA eng NO Ceniza-Bordallo G, Fraile AG, López-de-Uralde-Villanueva I, Rabbitts JA, Li R, Palermo TM, Martín-Casas P. Chronic postsurgical pain in young children: Prevalence, pain trajectories and physical and psychological prognostic factors. J Pain. 2025 Sep;34:105476. doi: 10.1016/j.jpain.2025.105476. Epub 2025 Jun 23. PMID: 40562263; PMCID: PMC12282272. NO Guillerm o Ceniza -Bordallo ’ s postdo ctora l fe llo wship by th e Fa culty of Nursing, Physiotherap y an d Podi atr y of th e Co mplutense Un ive rsity of Madrid an d Banc o Sa ntander (CT58 /21 -CT59/2 1) Je nnife r Ra bbitt s is funded by National Inst itute s of Health National Inst itute of Arthriti s an d Mu sculoskel eta l an d Skin Di sease s (Award K24AR08078 6) DS Docta Complutense RD 19 dic 2025