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Hyperphosphataemia can originate from tissue ischaemia and damage and may be associated with injury severity in polytrauma patients. In this retrospective, single-centre study, 166 polytrauma patients (injury severity score (ISS) ≥ 16) primarily requiring intensive care unit (ICU) treatment were analysed within a five-year timeframe. ICU-admission phosphate levels defined a hyperphosphataemic (&gt;1.45 mmol/L; n = 56) opposed to a non-hyperphosphataemic group ( n = 110). In the hyperphosphataemic group, injury severity was increased (ISS median and IQR: 38 (30-44) vs. 26 (22-34); p &lt; 0.001), as were signs of shock (lactate, resuscitation requirements), tissue damage (ASAT, ALAT, creatinine) and lastly in-hospital mortality (35.7% vs. 5.5%; p &lt; 0.001). Hyperphosphataemia at ICU admission was shown to be a risk factor for mortality (1.46-2.10 mmol/L: odds ratio (OR) 3.96 (95% confidence interval (CI) 1.03-15.16); p = 0.045; &gt;2.10 mmol/L: OR 12.81 (CI 3.45-47.48); p &lt; 0.001) and admission phosphate levels alone performed as good as injury severity score (ISS) in predicting in-hospital mortality (area under the ROC curve: 0.811 vs. 0.770; p = 0.389). Hyperphosphataemia at ICU admission is related to tissue damage and shock and indicates injury severity and subsequent mortality in polytrauma patients. Admission phosphate levels represent an easily feasible yet strong predictor for in-hospital mortality.

ICU-Admission Hyperphosphataemia Is Related to Shock and Tissue Damage, Indicating Injury Severity and Mortality in Polytrauma Patients