What does the term 'compression' refer to in first aid?

In the context of first aid, the term 'compression' specifically refers to the action of applying pressure to a wound to control bleeding. This technique is critical in emergency situations, especially when there is significant blood loss. By applying pressure directly to a bleeding wound, you can help to constrict blood vessels, reduce blood flow, and promote clot formation, which is essential in managing hemorrhage effectively.

While understanding the mechanism of injury, reducing swelling in joints, and diagnosing fractures are important components of first aid and injury assessment, they do not define the term 'compression' in the same way. Compression, when applied to a wound, is a focused technique to address a specific and immediate need for the patient, emphasizing its vital role in stabilizing a casualty until professional medical help can be obtained.