BLS Adult, Child & Infant Resuscitation 3 — Questions and Answers
Question 1: During high-quality CPR on an adult, what is the recommended rate of chest compressions?
- 60–80 compressions per minute
- 80–100 compressions per minute
- 100–120 compressions per minute (Correct answer)
- 120–140 compressions per minute
Correct answer: 100–120 compressions per minute
AHA BLS guidelines specify a compression rate of 100–120 compressions per minute for adults, children, and infants.
Question 2: A rescuer performing CPR on an adult allows the chest to fully recoil after each compression. Why is this important?
- It reduces the risk of rib fracture
- It allows the heart to refill with blood between compressions (Correct answer)
- It prevents the rescuer from fatiguing
- It keeps the airway open during compressions
Correct answer: It allows the heart to refill with blood between compressions
Full chest recoil allows the heart to passively fill with blood, which is then pumped during the next compression.
Question 3: For a child victim in cardiac arrest, what is the two-rescuer compression-to-ventilation ratio?
- 30:2
- 15:2 (Correct answer)
- 15:1
- 30:1
Correct answer: 15:2
Two rescuers performing CPR on a child use a 15:2 ratio to deliver more frequent ventilations to the pediatric patient.
Question 4: An AED arrives while CPR is in progress on an adult. What is the correct next step?
- Continue CPR for 2 more minutes before using the AED
- Stop CPR, power on the AED, and follow its prompts immediately (Correct answer)
- Deliver 5 rescue breaths, then attach AED pads
- Use the AED only if the victim has been in arrest for less than 5 minutes
Correct answer: Stop CPR, power on the AED, and follow its prompts immediately
The AED should be used as soon as it is available; power it on and follow the voice prompts without unnecessary delay.
Question 5: How far should the sternum be compressed during adult CPR?
- At least 1 inch
- At least 1.5 inches
- At least 2 inches (Correct answer)
- At least 3 inches
Correct answer: At least 2 inches
Adult compressions must be at least 2 inches (5 cm) deep but should not exceed 2.4 inches (6 cm) to be effective without causing excess injury.
Question 6: A bystander witnesses an adult collapse suddenly. After confirming unresponsiveness, what is the correct sequence of actions?
- Open airway, give 2 breaths, begin compressions
- Call 911 (or send someone), begin CPR, use AED when available (Correct answer)
- Give 5 back blows, begin compressions, call 911
- Check pulse for 30 seconds, call 911, begin CPR
Correct answer: Call 911 (or send someone), begin CPR, use AED when available
For witnessed adult cardiac arrest, the priority is activating EMS, starting CPR, and using an AED as soon as possible.
Question 7: Which of the following indicates ineffective rescue breathing during infant CPR?
- Visible chest rise with each breath
- Audible exhalation when compressions resume
- No visible chest movement during breaths (Correct answer)
- Brief pause in compressions to deliver breath
Correct answer: No visible chest movement during breaths
If the chest does not visibly rise during a rescue breath, the breath is not effective and airway positioning should be corrected.
BLS Adult, Child & Infant Resuscitation 3
During high-quality CPR on an adult, what is the recommended rate of chest compressions?