After surviving a cardiac arrest, what happens to your body temperature in the next 24 hours could be a strong predictor of whether you make it home. A new study published in the Journal of the American Heart Association analyzed over 36,500 in-hospital cardiac arrest patients and found that those with a peak temperature in the 36.8–37.3 °C range had the best odds of survival — a classic inverted U-shaped curve where both extremes spell trouble.

The study drew from the Get With The Guidelines-Resuscitation registry (2015–2024) and excluded patients treated with therapeutic hypothermia to capture the natural post-resuscitation temperature trajectory. The findings held true for neurological outcomes as well, with the normal-temperature group showing the highest rates of favorable brain function at discharge.

By the Numbers:

• 72.7% survival rate in the optimal temperature group (36.8–37.3 °C)
• 48.4% survival for patients with temps below 36.3 °C (aOR 0.42)
• 51.5% survival for patients with temps at or above 38.8 °C (aOR 0.40)
• 64.4% favorable neurological survival in the reference group vs. ~39% at temperature extremes

Why it matters: These findings suggest that post-resuscitation temperature monitoring could be a simple, actionable target for improving outcomes. Clinicians may need to be just as vigilant about preventing fever and hypothermia as they are about other post-cardiac arrest interventions.