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Accidental hypothermia as an independent risk factor of poor neurological outcome in older multiply injured patients with severe traumatic brain injury: a matched pair analysis

  • M. WinkelmannEmail author
  • W. Soechtig
  • C. Macke
  • C. Schroeter
  • J. D. Clausen
  • C. Zeckey
  • C. Krettek
  • P. Mommsen
Original Article

Abstract

Purpose

Patients with multiple injuries are particularly susceptible to accidental hypothermia which is correlated with an increased risk of post-traumatic complications and mortality; however, its impact on neurological outcome in cases where there is concomitant traumatic brain injury is underexplored.

Methods

We analyzed severely injured patients (ISS ≥ 16) including a moderate-to-severe traumatic brain injury (AISHead ≥ 3). The primary endpoint was objective neurological recovery, expressed as Glasgow Outcome Scale (GOS) score at time of discharge. Secondary endpoints were mortality, systemic inflammatory response syndrome (SIRS), sepsis, acute respiratory distress syndrome (ARDS) and multiple organ dysfunction syndrome (MODS). Statistical analysis included logistic regression (odds ratio). The significance level in all analyses was p = 0.05.

Results

We analyzed 278 patients (M age = 43 years, SD 19; M ISS = 32.8, SD 10.7). Mortality was 17% (n = 14). 102 patients (37%) were hypothermic on admission. Hypothermic patients were more severely injured (ISS 35.6 ± 11.1 vs. 31.2 ± 10.1, p = 0.001; APACHE II 18.1 ± 7.4 vs. 16.2 ± 7.3, p = 0.045) and had a higher transfusion requirement. Mortality rate in hypothermic patients was increased (23.5 vs. 13.1%, p = 0.03); however, hypothermia was not an independent predictor of mortality. Median GOS at discharge was 3 (IQR 3); in 47% of patients the outcome was favorable (GOS 4 or 5) and 36% it was poor (GOS 2 or 3). There were no differences in post-traumatic complications. Analysis of 73 matched pairs of hypothermic and normothermic patients could not prove hypothermia as an independent predictor of poor neurological outcome (OR 1.7, 95% CI 0.8–3.6, p = 0.1) in the total population. However, older patients (> 41 years) had a 4.2-times higher risk (95% CI 1.4–12.7; p = 0.01) of poor neurological outcome, if they were hypothermic on admission.

Conclusions

Accidental hypothermia seems to have a negative impact on neurological recovery in older patients with multiple injuries including traumatic brain injury which outweighs potential benefits.

Keywords

Traumatic brain injury Polytrauma Hypothermia Multiply injuries Neurological outcome 

Notes

Funding

No funding was received for this research.

Compliance with ethical standards

Conflict of interest

Marcel Winkelmann, Wiebke Soechtig, Christian Macke, Christian Schroeter, Jan-Dierk Clausen, Christian Zeckey, Christian Krettek and Philipp Mommsen declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Trauma DepartmentHannover Medical SchoolHanoverGermany

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