When should a tourniquet be applied?

A tourniquet should be applied when there is life-threatening external hemorrhage because it is a crucial intervention for stopping severe bleeding from an extremity that cannot be controlled by direct pressure alone. In cases of traumatic injuries where limbs are severely damaged, arterial bleeding can lead to rapid blood loss and potentially life-threatening situations. The application of a tourniquet helps to occlude blood flow to the affected area, thereby reducing the risk of shock and death from hemorrhagic injuries.

Applying a tourniquet for life-threatening hemorrhage is a time-sensitive action, as immediate control of bleeding is essential for survival. This practice aligns with the principles of Tactical Combat Casualty Care (TCCC), prioritizing the management of hemorrhagic shock in tactical environments. When a situation presents with bright red, pulsatile bleeding indicating arterial involvement, the application of a tourniquet becomes critical.