Final answer:
A tourniquet is used in severe, life-threatening bleeding when direct pressure fails, especially with limb wounds; it is not suitable for chest wounds.
Step-by-step explanation:
A tourniquet may be an appropriate intervention in the event of severe, life-threatening bleeding that cannot be controlled by direct pressure. Situations where a tourniquet is justified include circumstances such as when there are multiple victims with life-threatening injuries requiring care and other methods of bleeding control are not effective or feasible, or when a person has a severe limb wound with uncontrolled bleeding where direct pressure cannot be applied or is ineffective. It is typically used as a last resort due to potential complications such as tissue damage. In a situation where a patient has a bleeding chest wound, a tourniquet would not be appropriate, as it cannot be effectively applied to this area of the body.