Time Course of Changes in the Level of Procalcitonin in the Development of Nosocomial Pneumonia in Victims with Severe Concomitant Injury in an Intensive Care Unit

Background. The posttraumatic period in victims with severe concomitant injury is frequently complicated by nosocomial pneumonia, resulting in high mortality rates and longer time and increased cost of treatment in intensive care unit unit patients. Procalcitonin (PCT) is considered to be a marker for infectious complications due to different critical conditions; however, its prognostic value for different patient categories and periods after injury remains unclear; elevated PCT levels maybe related to the development of pneumonia in view of the severity of injury and the duration of mechanical ventilation (MV). Objective: to establish a correlation between the time course of changes in PCT levels and the development of nosocomial pneumonia and sepsis in victims with severe concomitant injury in relation to its severity and the duration of MV. Subjects and methods. The case histories of 271 victims with severe concomitant injury treated in the Intensive Care Unit, N. V. Sklifosovsky Research Institute of Emergency Care, in 2008—2012 were retro- and prospectively analyzed. The admission PCT level and its changes were analyzed in relation to the severity of injury and secondary infectious complications. Severe concomitant injury was ascertained to be accompanied by elevated serum PCT levels. A correlation was found between injury severity, mortality, the development of infectious pulmonary complications, sepsis, and mean PCT levels. The more severe the injury, the higher serum PCT level was revealed. In the first 12 hours, a group of victims without pneumonia exhibited the highest PCT levels (1.91±0.51 ng/ml). Later on there was its smooth fall and normalization by days 3—5. In the group of victims with pneumonia, but without sepsis, the PCT level averaged 1.71±0.64 ng/ml just in the first 6 hours, then its concentration continued to rise and its maximum level (3.93±1.26 ng/ml) was recorded in the first 48 hours. Later on, its decrease and normalization were observed by day 6 if the course of disease was favorable. A distinct pattern was seen in the group of victims with pneumonia and sepsis. Just in the first 6 hours, the mean level of PCT was 6.98±1.3 ng/ml and then its concentration continued to increase to 22.7±7.8 ng/ml in the first 48 hours. ROC analysis revealed the most prognostic effect of PCT at risk for pneumonia in the range from 12 to 24 hours since the ROC curve area was 0.753, which was good, as estimated by experts, and the cut-off was 1.79 ng/ml; moreover, sensitivity was 69.7% and specificity was also 69.7%. Conclusion. It is shown that it is expedient to monitor PCT levels in patients with severe concomitant injury from the admission of victims to hospital. The PCT concentration of more than 1.79 ng/ml during the first 12 hours after injury can serve as an early predictor for nosocomial pneumonia with a risk for further generalization of the process in victims with severe concomitant injury. Key words: severe concomitant injury, procalcitonin, infectious complications, pneumonia, sepsis, biomarker, predictor, mortality, ISS, mechanical ventilation.

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