Night admission is an independent risk factor for mortality in Night admission is an independent risk factor for mortality in Night admission is an independent risk factor for mortality in Night admission is an independent risk factor for mortality in Night admission is an independent risk factor for mortality in trauma patients -a systemic error approach trauma patients -a systemic error approach trauma patients -a systemic error approach trauma patients -a systemic error approach trauma patients -a systemic error approach Admissão noturna é fator de risco independente para mortalidade em pacientes Admissão noturna é fator de risco independente para mortalidade em pacientes Admissão noturna é fator de risco independente para mortalidade em pacientes Admissão noturna é fator de risco independente para mortalidade em pacientes Admissão noturna é fator de risco independente para mortalidade em pacientes vítimas de trauma -uma abordagem ao erro sistêmico vítimas de trauma -uma abordagem ao erro sistêmico vítimas de trauma -uma abordagem ao erro sistêmico vítimas de trauma -uma abordagem ao erro sistêmico vítimas de trauma -uma abordagem ao erro sistêmico LEONARDO DE [1][2][3] . Fatigue and lack of supervision to attending physicians may contribute to increased complications and hospital mortality. Such situations, also added to the circadian rhythm and dynamics of abnormal operating changes can be crucial factors for the worst performance in these periods. The cumulative presence of a number of unfavorable conditions is remarkable and very common in these periods, situations that favor and increase vulnerability to error [1][2][3][4][5][6][7][8][9][10] . Specific studies in patients with acute myocardial infarction, ischemic stroke and the Intensive Care Units showed higher rate of clinical complications and hospital mortality in the "off-hours" periods (nighttime or weekends) [4][5][6][7][8][9][10][11][12] . The volume of evidence demonstrating higher incidence of unfavorable outcomes in these adverse conditions weakens the idea of occasional errors as the cause of these events [4][5][6][7][8][9][10] . This highlights the need to analyze these situations trough of a model to interpret the error with a systemic view.Due to the lack of Brazilian studies, this study aimed to verify the impact of the shift of admission of patients who have suffered trauma, underwent surgery, in hospital mortality. According to these results, interpretation models and error correction are discussed. METHODS METHODS METHODS METHODS METHODSThis is a cohort study with retrospective collection of data, which were selected through electronic medical records, patients admitted from November 2011 to March 2012 in the emergency of Hospital do Subúrbio (HS) -a public hospital attending urgency and emergency and public-private administrative nature, in Subúrbio Ferroviá-rio, district of the city of Salvador, Bahia. The study included trauma patients admitted to the emergency HS who underwent surgery and were classified according to Internatio...