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Mechanical-piston devices and load-distributing band devices are designed to deliver continuous chest compressions during a cardiac arrest scenario. These devices apply consistent, effective compressions that enhance blood flow to vital organs, especially the brain and heart. Continuous chest compressions are crucial in improving the chances of survival and the outcome of resuscitation efforts.

Unlike manual compressions, which can be hindered by fatigue over time, mechanical devices maintain a steady and reliable compression rate and depth, following the established guidelines for CPR. This continuous compressive force increases the likelihood of maintaining perfusion while advanced care providers are preparing for intubation, defibrillation, or administering medications.

The other options do not accurately reflect the purpose of these devices: they do not allow for variable compressions or breaks in assessment nor do they focus solely on airway management; instead, their primary function is to ensure uninterrupted and effective chest compressions, which is critical in the context of cardiac arrest.