What best describes active hypothermia management?

Active hypothermia management involves the use of external heat sources to warm a casualty who is experiencing hypothermia. This approach is essential because it directly applies heat to the body in a controlled manner, effectively increasing core body temperature and aiding recovery.

Utilizing external heat sources can include methods such as heating blankets, warm water immersion, or heated air. These techniques enhance blood flow to the skin and subcutaneous tissues, which helps redistribute heat throughout the body. It’s a proactive approach aimed at addressing the increased risk of complications that can arise if the underlying body temperature remains low.

In contrast, options that focus on insulation or provide warm fluids alone do not effectively address significant hypothermia cases. Insulating materials are useful for preventing further heat loss but don't actively increase body temperature. Providing warm fluids can be beneficial as part of rewarming efforts, but it is not sufficient by itself for full active management. Removing clothing to cool a casualty directly contradicts the principles of managing hypothermia, as it further exposes the body to cold and exacerbates the condition.

Thus, the best description of active hypothermia management is indeed the use of external heat sources to warm a casualty.