BLS BLS High-Quality CPR & Provider Skills 3

Question 1

In CPR quality metrics, what does 'chest compression fraction' (CCF) measure?

Accepted Answer

The proportion of total resuscitation time spent actively performing chest compressions

Answer

The force applied to the chest with each individual compression

Answer

The ratio of compressions to ventilations in each CPR cycle

Answer

The depth of each compression as a fraction of total chest diameter

Question 2

What is the AHA target for chest compression fraction (CCF) during CPR?

Accepted Answer

At least 80%

Answer

Greater than 50%

Answer

Greater than 60%

Answer

Exactly 100%

Question 3

Which action BEST reduces interruptions in chest compressions during CPR?

Accepted Answer

Keeping all pauses under 10 seconds and preparing tasks without stopping compressions

Answer

Performing a pulse check every minute to guide treatment decisions

Answer

Always stopping compressions during ventilation cycles for safety

Answer

Rotating compressors every 5 minutes on a predictable schedule

Question 4

In 2-rescuer adult CPR before an advanced airway is placed, what is the correct compression-to-ventilation ratio?

Accepted Answer

30:2 — same as single-rescuer adult CPR

Answer

15:2 — the pediatric 2-rescuer ratio

Answer

30:1 — to minimize ventilation interruptions in adults

Answer

15:1 — a compromise ratio for 2-rescuer teams

Question 5

How often should rescuers rotate compression duties to maintain compression quality?

Accepted Answer

Every 2 minutes, corresponding to each rhythm check or AED analysis cycle

Answer

Every 5 minutes, or when the compressor requests relief

Answer

Every 10 minutes to minimize disruption to CPR rhythm

Answer

Only when the compressor's technique visibly deteriorates

Question 6

When should chest compressions be paused to allow the AED to analyze the heart rhythm?

Accepted Answer

Approximately every 2 minutes, aligned with compressor rotation and AED prompts

Answer

Every 60 seconds throughout the resuscitation

Answer

Only after the first shock has been delivered

Answer

Immediately whenever the AED is powered on