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

CCF measures how much of the total resuscitation time is spent actually compressing the chest — higher fractions correlate with better outcomes.

Question 2

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

Accepted Answer

At least 80%

Answer

The AHA recommends achieving a CCF of at least 80%, meaning compressions should be active for at least 80% of resuscitation time.

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

Limiting all pauses to under 10 seconds and performing preparatory tasks during ongoing compressions maintains a high compression fraction.

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

Adult 2-rescuer CPR uses 30:2, the same as single-rescuer, until an advanced airway is placed and asynchronous ventilation begins.

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

Research shows compression depth and rate degrade significantly within 2 minutes, so rotating at every 2-minute rhythm check maintains high-quality CPR.

BLS - Basic Life Support Practice Test

BLS - Basic Life Support Practice Test

BLS BLS High-Quality CPR & Provider Skills 3