Abstract
Studies on patients with cardiac arrest or sepsis have reported that high initial phosphate levels are associated with poor outcomes. However, no previous study has investigated the association between initial phosphate levels and outcomes in blunt trauma patients. This study was a retrospective observational study conducted on blunt trauma patients who had been treated at the single regional trauma center between January 2016 and December 2017. Patients' demographic data, initial vital signs, trauma scores, and laboratory parameters including phosphate levels were collected from the trauma registry. The primary outcome was set to 30-day mortality. The secondary outcomes were the total volume of blood transfused, 30-day hospital-free days, and 30-day intensive care unit-free days. Of the 1,907 included patients, 1,836 were in the survival group, and 71 were in the nonsurvival group. The nonsurvival group had a significantly higher phosphate level than the survival group. Patients in the hyperphosphatemia group had a higher 30-day mortality, fewer 30-day intensive care unit-free days, and higher transfusion volume than those in the other groups. In multivariable logistic regression analysis, hyperphosphatemia was independently associated with 30-day mortality. The receiver operating characteristic curve analysis showed that the area under the curve with the inclusion of phosphate in addition to Injury Severity Score, Revised Trauma Score, and age was 0.911. Area under the curve was also increased when phosphate was simply added to Injury Severity Score and Revised Trauma Score. In blunt trauma patients, hyperphosphatemia was associated with an increased 30-day mortality. Prognostic, level III.
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