• Jesper Johnsson, Josefine Wahlström, Josef Dankiewicz, Martin Annborn, Sachin Agarwal, Allison Dupont, Sune Forsberg, Hans Friberg, Robert Hand, Karen G Hirsch, Teresa May, John A McPherson, Michael R Mooney, Nainesh Patel, Richard R Riker, Pascal Stammet, Eldar Søreide, David B Seder, and Niklas Nielsen.
• Department of Anaesthesiology and Intensive Care, Helsingborg Hospital, Helsingborg, Sweden; Department of Clinical Sciences, Lund University, Lund, Sweden. Electronic address: jesper.johnsson@skane.se.
• Resuscitation. 2020 Jan 1; 146: 229-236.

IntroductionTargeted temperature management (TTM) after out-of-hospital cardiac arrest (OHCA) has been recommended in international guidelines since 2005. The TTM-trial published in 2013 showed no difference in survival or neurological outcome for patients randomised to 33 °C or 36 °C, and many hospitals have changed practice. The optimal utilization of TTM is still debated. This study aimed to analyse if a difference in temperature goal was associated with outcome in an unselected international registry population.MethodsThis is a retrospective observational study based on a prospective registry - the International Cardiac Arrest Registry 2. Patients were categorized as receiving TTM in the lower range at 32-34 °C (TTM-low) or at 35-37 °C (TTM-high). Primary outcome was good functional status defined as cerebral performance category (CPC) of 1-2 at hospital discharge and secondary outcome was adverse events related to TTM. A logistic regression model was created to evaluate the independent effect of temperature by correcting for clinical and demographic factors associated with outcome.ResultsOf 1710 patients included, 1242 (72,6%) received TTM-low and 468 (27,4%) TTM-high. In patients receiving TTM-low, 31.3% survived with good outcome compared to 28.8% in the TTM-high group. There was no significant association between temperature and outcome (p = 0.352). In analyses adjusted for baseline differences the OR for a good outcome with TTM-low was 1.27, 95% CI (0.94-1.73). Haemodynamic instability leading to discontinuation of TTM was more common in TTM-low.ConclusionsNo significant difference in functional outcome at hospital discharge was found in patients receiving lower- versus higher targeted temperature management.Copyright © 2019 The Author(s). Published by Elsevier B.V. All rights reserved.

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