During cardiac arrest, the resuscitation team must perform several critical tasks alongside chest compressions, including rhythm checks, defibrillation, ventilation, and compressor changes. The way these tasks are timed and coordinated can affect how continuously compressions are delivered throughout the event.
Chest compression fraction (CCF) represents the proportion of the resuscitation period during which chest compressions are being performed. A high CCF means spending more of the available time performing chest compressions while maintaining the recommended standards of high-quality CPR.
Achieving a high CCF requires more than simply reducing pauses. The team must organize necessary interventions efficiently while preserving effective CPR. This guide explains what chest compression fraction (CCF) means, how to calculate it, the 6 steps to achieve a high CCF while performing high-quality CPR, and how to monitor CCF during resuscitation.
What Is Chest Compression Fraction?
Chest compression fraction is the percentage of the resuscitation period during which chest compressions are being delivered.
CCF = Total time spent performing chest compressions ÷ Total resuscitation time × 100
For example, if compressions are delivered for 8 minutes during a 10-minute resuscitation period, the CCF is 80%.
CCF shows how much of the total resuscitation time is spent performing chest compressions. Compression rate measures how frequently compressions are delivered. These are different measures, so increasing CCF does not mean simply increasing the compression rate.
6 Steps to Achieve a High CCF While Performing High-Quality CPR
The key to achieving a high CCF is to limit avoidable time without compressions while keeping necessary pauses brief and well-coordinated. The team can improve CCF by preparing for each intervention in advance and restarting compressions as soon as the intervention is complete.
The following six steps can help the team achieve a high CCF while continuing to perform high-quality CPR:
1. Minimize Unnecessary Pauses
Avoid stopping chest compressions for actions that can be performed while compressions continue.
Team members should prepare equipment, ventilation equipment, and other tasks without unnecessarily interrupting the compressor. Necessary pauses should remain as short as possible.
2. Prepare for Defibrillation Before the Pause
When a shockable rhythm is identified, the team should prepare for defibrillation while CPR continues and keep the pause before the shock as brief as possible.
The AED or defibrillator should be ready while CPR continues whenever possible. Once the shock is delivered, chest compressions should resume immediately rather than waiting for an additional postshock rhythm check.
3. Coordinate Rhythm Checks
Rhythm analysis requires a temporary pause in compressions. The team should be prepared to perform the rhythm check quickly and restart CPR as soon as the assessment is complete.
During an adult rhythm check, the pulse check should take no more than 10 seconds. If no definite pulse is felt, resume chest compressions immediately.
4. Change Compressors Efficiently
Compressor fatigue can affect CPR performance, so changing compressors remains important.
When multiple rescuers are available, switching chest compressors approximately every 2 minutes is reasonable. The transition should be coordinated so that changing rescuers creates as little interruption as possible.
5. Resume Compressions Promptly After Defibrillation
A postshock pause adds time without chest compressions. After shock delivery, the next step should be immediate resumption of CPR.
The adult BLS algorithm instructs rescuers to resume CPR immediately after a shock for 2 minutes, until prompted by the AED or defibrillator for another rhythm check.
6. Coordinate Team Roles
Clear role assignment helps prevent delays during a code.
The compressor should concentrate on chest compressions while other team members prepare for rhythm analysis, defibrillation, ventilation, medication administration, and compressor changes. A CPR coach or team leader can also monitor interruptions and help the group recognize when compressions need to restart.
While these 6 steps can help you achieve a high CCF during high-quality CPR, hands-on training is essential for applying these skills in real-world emergencies. You can enroll in an AHA BLS class to build practical CPR skills and prepare to respond effectively during cardiac emergencies.
What Is a Good Chest Compression Fraction During CPR?
For adult cardiac arrest, the 2025 AHA Guidelines state that performing CPR with a chest compression fraction of at least 60% may be reasonable. The guidelines also note that high-performance teams may achieve higher levels, such as greater than 80%.
CCF should be interpreted alongside other measures of CPR quality. A team should not pursue a higher CCF by compromising appropriate compression rate, depth, chest recoil, or effective ventilation.
The practical goal is to maximize compression time while maintaining all the other components of high-quality CPR.
What Should the Compressor Do to Maintain a High CCF?
The compressor plays a central role in maintaining CCF, but achieving a high CCF requires coordination from the entire resuscitation team.
The compressor should maintain effective chest compressions and communicate when fatigue requires a switch. Another rescuer should be ready to take over so the transition can occur efficiently.
The team should also anticipate rhythm checks, defibrillation, and ventilation so the compressor does not remain stopped longer than necessary.
How Can Chest Compression Fraction Be Monitored?
CCF can be reviewed during and after a resuscitation to determine how much of the arrest period was spent delivering chest compressions.
Teams can also review:
- Duration of pauses
- Number of interruptions
- Time between rhythm analysis and resumed CPR
- Preshock and postshock pauses
- Timing of compressor changes
Audiovisual feedback devices can provide real-time information about CPR performance. Monitoring these measures can help a team identify unnecessary interruptions and improve performance during future resuscitations.
Maintain High CCF With Effective CPR Training
Hands-on CPR training helps teams build the coordination needed to perform resuscitation efficiently. Working through rhythm checks, defibrillation, compressor changes, and team communication can help reduce unnecessary interruptions while maintaining high-quality CPR.
New York CPR Classes offers American Heart Association BLS, ACLS, and PALS training for healthcare professionals and other qualified providers. With flexible training options and skill verification stations throughout New York, you can complete your training on a schedule that works for you. After successful completion, receive your AHA Provider eCard the same day, with credentials recognized throughout the United States.
Frequently Asked Questions
What Is the Difference Between CCF and Compression Rate?
CCF indicates the percentage of the resuscitation period during which chest compressions are performed, while compression rate refers to the number of chest compressions delivered each minute. CCF measures how continuously compressions are provided, whereas compression rate measures the speed of compressions.
Does a Higher CCF Always Mean Better CPR?
A higher CCF alone does not describe the complete quality of CPR. Compression rate, depth, recoil, ventilation, and other aspects of CPR also matter. Increasing CCF should not come at the expense of these measures.
Can CCF Be Higher Than 80% During CPR?
Yes. The 2025 AHA Guidelines state that a CCF of at least 60% may be reasonable for adults, while high-performance teams may achieve higher levels, such as greater than 80%.
How Long Should a Pulse Check Take During Adult CPR?
During an adult cardiac arrest rhythm check, the pulse check should take no more than 10 seconds. When a pulse is not definitely felt, chest compressions should be restarted immediately.
Why Does Compressor Switching Matter During CPR?
Changing compressors helps address fatigue and maintain effective chest compressions. When multiple rescuers are available, switching approximately every 2 minutes is considered reasonable.
How can you increase chest compression fraction during a code?
Increase CCF by minimizing unnecessary interruptions, preparing for rhythm checks and defibrillation in advance, coordinating compressor changes efficiently, and resuming compressions immediately after necessary interventions. Clear team roles and efficient coordination help reduce avoidable pauses while maintaining high-quality CPR.
How do pauses in chest compressions affect CCF?
Pauses reduce CCF by decreasing the proportion of resuscitation time spent performing chest compressions. Some interruptions are necessary for rhythm analysis, ventilation, and defibrillation, but keeping them brief and resuming compressions promptly can help maintain a higher CCF.
