In emergency care for a blunt chest injury, why should the person hold something bulky against their chest?

Holding something bulky against the chest in the case of a blunt chest injury serves primarily to prevent further injury. This technique is important because it helps to stabilize the area and limit any movement that could exacerbate existing damage. By providing external support, the person can also manage any pain associated with the injury and protect vital organs that may be impacted by the force of the injury.

Using a bulky object can create a barrier that restricts movement, which is crucial in reducing the risk of further complications, such as rib fractures piercing the lung or other internal structures. Additionally, it can help the person feel more secure and in control, especially during a distressing situation.

Other options, while they may seem relevant, do not directly address the immediate concern of preventing further injury in the context of a blunt chest trauma.