Basic Life Support (BLS) Practice Exam

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Prepare for the Basic Life Support Test. Study with flashcards and multiple choice questions, complete with hints and explanations. Get ready for your exam!

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What should the depth of chest compressions be for adults during CPR?

At least 3 cm
At least 5 cm
At least 7 cm
At least 10 cm

The correct answer is: At least 5 cm

The depth of chest compressions during CPR for adults should be at least 5 cm. This depth is crucial because effective compressions need to create sufficient blood flow to the heart and brain during cardiac arrest. Studies have shown that compressions at this depth are more likely to generate adequate coronary and cerebral perfusion pressure. Compressions that are too shallow may not be effective in achieving the goals of CPR, including restoring spontaneous circulation and preventing neurological damage. The guidance provided by various resuscitation councils emphasizes that 5 cm is the minimum depth to ensure compressions reach the required pressure on the chest. Maintaining the correct depth, along with the appropriate rate and allowing full chest recoil between compressions, maximizes the chances of survival for a person experiencing cardiac arrest. Too much emphasis on depth can also lead to fatigue and hinder the quality of compressions, which is why the focus remains on reaching that minimum threshold of 5 cm rather than going deeper than that, which might not add beneficial effects and could cause injury.