Protein S100 as outcome predictor after out-of-hospital cardiac arrest and targeted temperature management at 33 degrees C and 36 degrees C.

  • Competence Center for Methodology and Statistics
June 20, 2017 By:
  • Stammet P
  • Dankiewicz J
  • Nielsen N
  • Fays F
  • Collignon O
  • Hassager C
  • Wanscher M
  • Unden J
  • Wetterslev J
  • Pellis T
  • Aneman A
  • Hovdenes J
  • Wise MP
  • Gilson G
  • Erlinge D
  • Horn J
  • Cronberg T
  • Kuiper M
  • Kjaergaard J
  • Gasche Y
  • Devaux Y
  • Friberg H
  • Target Temperature Management after Out-of-Hospital Cardiac Arrest (TTM) trial investigators.

BACKGROUND: We aimed to investigate the diagnostic performance of S100 as an outcome predictor after out-of-hospital cardiac arrest (OHCA) and the potential influence of two target temperatures (33 degrees C and 36 degrees C) on serum levels of S100. METHODS: This is a substudy of the Target Temperature Management after Out-of-Hospital Cardiac Arrest (TTM) trial. Serum levels of S100 were measured a posteriori in a core laboratory in samples collected at 24, 48, and 72 h after OHCA. Outcome at 6 months was assessed using the Cerebral Performance Categories Scale (CPC 1-2 = good outcome, CPC 3-5 = poor outcome). RESULTS: We included 687 patients from 29 sites in Europe. Median S100 values were higher in patients with a poor outcome at 24, 48, and 72 h: 0.19 (IQR 0.10-0.49) versus 0.08 (IQR 0.06-0.11) mug/ml, 0.16 (IQR 0.10-0.44) versus 0.07 (IQR 0.06-0.11) mug/L, and 0.13 (IQR 0.08-0.26) versus 0.06 (IQR 0.05-0.09) mug/L (p < 0.001), respectively. The ability to predict outcome was best at 24 h with an AUC of 0.80 (95% CI 0.77-0.83). S100 values were higher at 24 and 72 h in the 33 degrees C group than in the 36 degrees C group (0.12 [0.07-0.22] versus 0.10 [0.07-0.21] mug/L and 0.09 [0.06-0.17] versus 0.08 [0.05-0.10], respectively) (p < 0.02). In multivariable analyses including baseline variables and the allocated target temperature, the addition of S100 improved the AUC from 0.80 to 0.84 (95% CI 0.81-0.87) (p < 0.001), but S100 was not an independent outcome predictor. Adding S100 to the same model including neuron-specific enolase (NSE) did not further improve the AUC. CONCLUSIONS: The allocated target temperature did not affect S100 to a clinically relevant degree. High S100 values are predictive of poor outcome but do not add value to present prognostication models with or without NSE. S100 measured at 24 h and afterward is of limited value in clinical outcome prediction after OHCA. TRIAL REGISTRATION: identifier: NCT01020916 . Registered on 25 November 2009.

2017 Jun. Crit Care.21(1):153.
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