Emergency Medical Responder (EMR) EOPA Practice Test

What is the recommended depth of chest compressions for an adult?

About 1 inch More than 3 inches At least 2 inches, but no more than 2.4 inches Any depth as long as pace is fast

Correct Answer:

At least 2 inches, but no more than 2.4 inches

Explanation:

High-quality adult CPR requires a specific chest compression depth to generate blood flow. The target depth is at least 2 inches (5 cm) but no more than 2.4 inches (6 cm). This range provides enough pressure to circulate blood to vital organs while minimizing the risk of injury from over-penetration. Compressions that are only about 1 inch are unlikely to generate adequate perfusion, and compressions deeper than 2.4 inches can cause harm without added benefit. Maintain full chest recoil between compressions and aim for a rate of about 100–120 compressions per minute.

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