Time to Cooling Is Associated with Resuscitation Outcomes

Area of Science:

• Cardiology and Critical Care Medicine

Background:

• Targeted temperature management (TTM) following cardiac arrest is crucial for patient outcomes.
• The optimal timing and rate of cooling after return of spontaneous circulation (ROSC) remain areas for optimization.

Purpose of the Study:

• To analyze evidence on the timing of cooling in post-ROSC TTM.
• To recommend future directions for optimizing TTM therapy, specifically focusing on cooling strategies.

Main Methods:

• A preliminary review of animal and patient studies on post-ROSC TTM was conducted.
• Clinical studies (2002-2014) from PubMed and a systematic review were analyzed, excluding cardiopulmonary bypass cooling.
• 13 studies involving 4700 patients were compared, dichotomizing rapid cooling (≤3.5 hours to 34°C, ≥3.0°C/hour, no cold infusions) versus slower cooling.

Main Results:

• Rapid cooling without volume-adding cold infusions was associated with a higher rate of good neurological recovery compared to slower cooling methods.
• Achieving a temperature below 34°C within 3.5 hours of ROSC and employing a cooling rate exceeding 3°C/hour demonstrated beneficial effects.

Conclusions:

• Rapid initiation of cooling post-ROSC, defined by specific temperature and rate targets without cold infusions, appears to improve neurological outcomes.
• Future TTM strategies should consider implementing faster cooling protocols to enhance patient recovery after cardiac arrest.