What is an indication for applying a CAT tourniquet?

Applying a CAT (Combat Application Tourniquet) is indicated in situations where bleeding is life-threatening and cannot be controlled through standard methods, such as direct pressure. Life-threatening bleeding typically involves significant arterial blood loss from a limb that poses a risk to the patient's life, and may be associated with conditions like traumatic amputations or severe lacerations.

When direct pressure fails to manage extensive bleeding or when the situation requires more immediate and decisive action, a tourniquet provides a rapid means of constricting blood flow to the affected area. This is crucial in emergency situations where time is of the essence, and preserving the patient's overall survival is the top priority.

Other scenarios, such as minor cuts and bruises, or cases where bleeding is under control, are not appropriate for tourniquet application as they do not present the same level of urgency or the risk of death that necessitates such a drastic intervention. The aim with a tourniquet is to control serious hemorrhage effectively, ensuring that the patient can be stabilized for further medical treatment.