What is the primary reason for using a tourniquet in emergency situations?

The primary reason for using a tourniquet in emergency situations is to stop severe bleeding from a limb. When a traumatic injury occurs, especially to an extremity, it can result in life-threatening hemorrhage. A tourniquet is applied above the injury site to constrict blood flow, thus controlling the loss of blood. This action is crucial, as uncontrolled bleeding can lead to shock or death within minutes.

In situations where a limb is severely injured, the pressure applied by the tourniquet helps to create an artificial barrier that prevents blood from escaping. This allows for time to receive further medical treatment without the immediate threat of exsanguination. It's important to note that while other measures may be needed for pain relief or to prevent infection, the primary objective of a tourniquet is to manage and stop bleeding effectively.