What treatment is classified as active in the management of hypothermia?

Active treatment in the management of hypothermia refers to interventions designed to actively increase the core body temperature of the individual. A warm shower or bath is considered an active treatment because it directly exposes the body to warm water, effectively transferring heat to the body and facilitating a rise in core temperature.

In contrast, wrapping someone in a blanket or covering them with towels are forms of passive rewarming techniques. These options can provide insulation and prevent further heat loss but do not generate heat themselves. Similarly, using hot water bottles, while they can also be beneficial, typically serves as a supplemental passive warming method rather than providing the direct and immediate heat exposure that comes from a warm shower or bath.

Thus, the warm shower or bath stands out as the most effective active rewarming method among the options listed, making it essential for effectively treating significant hypothermia.