Paramedic National Registry Practice

What is the definition of crush injury?

1. A laceration caused by a sharp object

2. A compressive force causing cellular disruption

3. An open fracture

4. A burn injury

The correct answer is: A compressive force causing cellular disruption

The definition of a crush injury is rooted in the mechanism of injury, which involves a compressive force that leads to cellular disruption. This type of injury typically occurs when a body part is subjected to significant pressure, such as from being compressed between heavy objects or machinery, resulting in damage to tissues and cells within the affected area. The process not only affects the skin but often penetrates deeper tissues, including muscles, blood vessels, and nerves. Crush injuries are concerning because, in addition to local tissue damage, they can also cause systemic effects, such as crush syndrome, where toxins are released into the bloodstream following the reperfusion of crushed tissue. Understanding the mechanism helps in anticipating complications and informing treatment protocols. In contrast, a laceration is specifically a cut or tear in the skin caused by sharp objects, which is not the same as a crush injury. An open fracture refers to a break in the bone that communicates with the outside through the skin, distinguishing it from the internal cellular disruption seen in crush injuries. A burn injury refers to damage caused by heat, chemicals, or radiation, which does not align with the compressive force characteristic of crush injuries. Thus, the correct definition of a crush injury is indeed the one highlighting the compressive force