Version October 2024
| Stage | Core temperature | Physiologic changes |
| Mild | 32-35°C (90-95°F) | Shivering |
| Increased metabolism | ||
| Vasoconstriction | ||
| Mild tachycardia | ||
| Moderate | 28-32°C (82-90°F) | Loss of compensatory shivering |
| Decreasing metabolism | ||
| Decreasing cerebral blood flow | ||
| Diuresis | ||
| Extravasation of fluids | ||
| Hypovolemia | ||
| Severe | <28°C (82°F) | Muscle rigidity without shivering |
| Loss of thermoregulation | ||
| Vasodilation | ||
| Decreased HR, SV, CO | ||
| Decreased cardiac conduction | ||
| Increased cardiac irritability | ||
| Slowed nerve conduction | ||
| Suspended cerebral activity |
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