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Esophageal Heat Transfer for Patient Temperature Control and Targeted Temperature Management

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Published on: November 21, 2017

Hypothermic versus Normothermic Temperature Control after Cardiac Arrest.

Johan Holgersson¹, Martin Abild Stengaard Meyer², Josef Dankiewicz³

¹Anesthesiology and Intensive Care, Department of Clinical Sciences, Helsingborg Hospital Lund, Lund University, Lund, Sweden.

|February 6, 2024

Summary

Targeted temperature management using hypothermia at 33°C did not reduce mortality in comatose cardiac arrest survivors. This meta-analysis found no significant difference in outcomes between hypothermia and normothermia groups.

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Area of Science:

Cardiology
Critical Care Medicine
Neurology

Background:

Evidence for therapeutic hypothermia in comatose cardiac arrest survivors remains inconclusive.
Optimal temperature management strategies and their efficacy across different patient populations and arrest circumstances are debated.

Approach:

An individual patient data meta-analysis combined data from the Targeted Temperature Management at 33°C versus 36°C after Cardiac Arrest (TTM) and Hypothermia versus Normothermia after Out-of-Hospital Cardiac Arrest (TTM2) trials.
The study compared hypothermia at 33°C against normothermia, analyzing all-cause mortality and poor functional outcomes at 6 months.
Predefined subgroups (age, sex, cardiac rhythm, time to circulation, shock) were assessed for interaction with the intervention.

Key Points:

The primary analysis included 2800 patients; hypothermia did not significantly decrease 6-month all-cause mortality (49.4% vs. 47.9%, RR 1.03, P=0.41).
Poor functional outcomes were also similar between groups (54.3% vs. 54.0%, RR 1.01, P=0.88).
No significant differences in outcomes were observed across predefined subgroups, indicating consistent results.

Conclusions:

Therapeutic hypothermia at 33°C is not superior to normothermia for improving survival or functional outcomes in comatose survivors of out-of-hospital cardiac arrest.
The findings suggest that current guidelines on targeted temperature management may need re-evaluation based on this comprehensive meta-analysis.