ACLS BLS and High-Quality CPR 3

Question 1

During CPR on an adult, chest recoil between compressions is important primarily because it:

Accepted Answer

Allows the heart to refill with blood

Answer

Full chest recoil allows venous blood to return to the heart (venous return), creating preload for the next compression.

Question 2

A 70 kg adult is in cardiac arrest. Bag-mask ventilation is being performed. What tidal volume is recommended per breath?

Accepted Answer

500–600 mL

Answer

A tidal volume of 500–600 mL (enough to see chest rise) is recommended to avoid gastric insufflation and lung injury.

Question 3

Which of the following is the correct hand placement for adult chest compressions?

Accepted Answer

Center of the chest on the lower half of the sternum

Answer

Hands are placed on the lower half of the sternum (center of the chest), which optimally compresses the heart between the sternum and spine.

Question 4

An advanced airway (endotracheal tube) is in place during CPR. How should ventilations be delivered?

Accepted Answer

1 breath every 6 seconds, asynchronously with compressions

Answer

Once an advanced airway is secured, ventilations are given asynchronously at a rate of 1 breath every 6 seconds (10 breaths/min) without interrupting compressions.

Question 5

What is a key indicator that CPR is resulting in ROSC (return of spontaneous circulation)?

Accepted Answer

ETCO2 abruptly rises to 35–40 mmHg

Answer

A sudden rise in ETCO2 to near-normal levels (35–40 mmHg) indicates restored cardiac output and strongly suggests ROSC.

ACLS Practice Test

ACLS Practice Test

ACLS BLS and High-Quality CPR 3