Nonoperative management of splenic injuries: significance of age

Background: In the nonoperative management (NOM) of blunt splenic injuries (BSI), the clinical relevance of age as a risk factor has not been well studied. Methods: Using the 2011 National Trauma Data Bank data set, age was analyzed both as a continuous variable and a categorical variable (group 1 [13-54 y], group 2 [55-74 y], and group 3 [>= 75 y]). BSI severity was stratified by abbreviated injury scale (AIS): group 1 (AIS <= 2), group 2 (AIS 3), and group 3 (AIS >= 4). A semiparametric proportional odds model was used to model NOM outcomes and effects due to age and BSI severity. Results: Of 15,113 subjects, 15.3% failed NOM. The odds of failure increased by a factor of 1.014 for each year of age, or factor of 1.5 for groups 2 and 3 each. BSI severity groups 2 and 3 had increases in the odds of failure by factors of 3.9 and 13, respectively, compared with those of group 1. Most failures occurred by 48 h irrespective of age. The effect of age was most pronounced in age groups 2 and 3 with the most severe BSI, where a NOM failure rate of >50% was seen. Both age and failure of NOM were independent predictors of mortality. Conclusions: Age is associated with failure of NOM but its effect seems more clinically relevant only in high-grade BSI. Factors that could influence NOM success in elderly patients with high-grade injuries deserve further study. (C) 2016 Elsevier Inc. All rights reserved.