Which method provides external heating when managing hypothermia in a trauma casualty?

The method that provides external heating when managing hypothermia in a trauma casualty is active hypothermia management. This approach involves direct intervention to increase body temperature, which can include techniques like the application of warming devices or heated blankets. Active methods are designed to deliver heat directly to the patient, ensuring that their core body temperature is raised effectively and as quickly as possible.

Active hypothermia management contrasts with passive methods, where the focus is on maintaining the body’s existing heat without actively warming the patient. While insulation blankets can help to retain body heat, they do not actively raise the temperature; they primarily serve to prevent further heat loss. Fluid warming systems are also effective in warming the patient, typically through intravenous fluids, but the question specifically asks for external heating methods, which is more aligned with active hypothermia management techniques.