Flail chest happens when multiple adjacent ribs are fractured in two places, creating a free-floating segment of chest wall. That unstable section moves paradoxically with breathing—moving inward as the rest of the chest expands and outward as it recoils—which disrupts normal ventilation and leads to poor air exchange. The description that multiple ribs are broken and the chest cannot expand properly captures this loss of chest-wall stability and the resulting breathing difficulty. Bruising or a single rib fracture don’t produce the unstable, paradoxical movement that defines a flail segment, and a chest that “collapses completely” describes a more extreme or different scenario than flail chest. In a real incident, treat this as a medical emergency: ensure airway and breathing, call for help, and provide oxygen if available while monitoring the person.

R stands for Rest: right after an injury, limit the use of the injured part to prevent further tissue damage and give it a chance to begin healing. Resting reduces ongoing stress on the affected muscles or ligaments, helps control pain, and sets the stage for the next steps of the protocol. After resting, you typically apply Ice to numb pain and reduce swelling, use Compression to support the area and limit swelling, and Elevation to help drain away swelling by raising the limb. Immobilization isn’t what the R represents—it’s a consideration in some cases under guidance, but not the meaning of the R in this acronym.

When a person is too large to move by lifting and carrying, the technique you choose should minimize how much weight you have to lift and use your legs for leverage. The ankle drag does exactly that: you grab at the ankles and pull the person along the floor, allowing you to move a heavy individual without straining your back or arms. This method keeps the body low to the ground and uses your leg muscles to generate the pull, which is safer and more efficient for moving someone who can't be moved by other methods. It’s particularly useful for a quick relocation to safety when space or help is limited, and you don’t need to lift the torso or shoulders.

The main idea is that chest compressions should be as continuous as possible because each compression builds and maintains blood flow to the heart and brain. When you pause, the blood pressure falls and brain and heart perfusion drop, making it harder to achieve a good outcome. That’s why the recommended maximum interruption time is under 10 seconds—keep pauses very brief, especially during rhythm checks or defibrillation, and resume compressions within that short window. Longer pauses, like those implied by the other options, would allow perfusion to decline and reduce the chances of return of spontaneous circulation.