BLS BLS High-Quality CPR & Provider Skills

Question 1

What is the recommended compression depth for adult CPR to meet the AHA definition of high-quality CPR?

Accepted Answer

At least 2 inches but no more than 2.4 inches

Answer

The AHA recommends 2–2.4 inches for adult compression depth; shallower depth fails to perfuse organs and deeper depth risks internal injury.

Question 2

How long should a rescuer spend checking for a carotid pulse before deciding to start CPR?

Accepted Answer

No more than 10 seconds

Answer

A pulse check must take no more than 10 seconds; if absent or uncertain, CPR must begin immediately to minimize delay.

Question 3

Where should the rescuer's hands be placed for adult chest compressions?

Accepted Answer

Lower half of the sternum, at the center of the chest

Answer

Placing hands on the lower half of the sternum at the center of the chest delivers effective compressions without xiphoid or rib injury.

Question 4

During 2-rescuer CPR, how frequently should rescuers switch compression duties?

Accepted Answer

Approximately every 2 minutes (after 5 cycles of 30:2)

Answer

Compressor fatigue rapidly degrades compression depth and rate; switching every 2 minutes maintains the quality of high-quality CPR.

Question 5

What does 'allowing full chest recoil' mean during CPR?

Accepted Answer

Releasing all downward pressure so the chest fully rises between compressions

Answer

Full recoil between compressions allows the heart to refill with blood, optimizing venous return and coronary perfusion pressure.

BLS - Basic Life Support Practice Test