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ABSTRACT Objective: to identify victims of blunt abdominal trauma in which intra-abdominal injuries can be excluded by clinical criteria and by complete abdominal ultrasonography. Methods: retrospective analysis of victims of blunt trauma in which the following clinical variables were analyzed: hemodynamic stability, normal neurologic exam at admission, normal physical exam of the chest at admission, normal abdomen and pelvis physical exam at admission and absence of distracting lesions (Abbreviated Injury Scale >2 at skull, thorax and/or extremities). The ultrasound results were then studied in the group of patients with all clinical variables evaluated. Results: we studied 5536 victims of blunt trauma. Intra-abdominal lesions with AIS>1 were identified in 144 (2.6%); in patients with hemodynamic stability they were present in 86 (2%); in those with hemodynamic stability and normal neurological exam at admission in 50 (1.8%); in patients with hemodynamic stability and normal neurological and chest physical exam at admission, in 39 (1.5%); in those with hemodynamic stability, normal neurological, chest, abdominal and pelvic physical exam at admission, in 12 (0.5%); in patients with hemodynamic stability, normal neurological, chest, abdominal and pelvic physical exam at admission, and absence of distracting lesions, only two (0.1%) had intra-abdominal lesions. Among those with all clinical variables, 693 had normal total abdominal ultrasound, and, within this group, there were no identified intra-abdominal lesions. Conclusion: when all clinical criteria and total abdominal ultrasound are associated, it is possible to identify a group of victims of blunt trauma with low chance of significant intra-abdominal lesions.

RESUMO Objetivo: analisar a correlação do mecanismo de trauma com a frequência e a gravidade das lesões. Métodos: análise retrospectiva das informações do registro de trauma em período de 15 meses. O mecanismo de trauma foi classificado em seis tipos: ocupantes de veículo de quadro rodas envolvidos em acidente de tráfego (AUTO), pedestres vítimas de atropelamento (ATRO), motociclistas vítimas de acidentes de tráfego (MOTO), vítimas de quedas de altura (QUED), vítimas de agressão física com instrumentos contundentes (AGRE) e vítimas de queda do mesmo nível (QMN). Resultados: o mecanismo de trauma foi classificado em 3639 casos, sendo 337 (9,3%) AUTO, 855 (23,5%) ATRO, 924 (25,4%) MOTO, 455 (12,5%) QUED, 424 (11,7%) AGRE e 644 (17,7%) QMN. Houve diferença significativa na comparação entre os grupos das médias dos índices do Revised Trauma Score (RTS), do Injury Severity Score (ISS) e da Abbreviated Injury Scale (AIS) do segmento cefálico, torácico, abdominal e extremidades (p