During CPR, what quality is critical to ensure its effectiveness?

The effectiveness of CPR is heavily reliant on maintaining a consistent rhythm and depth during chest compressions. This consistency is essential for generating adequate blood flow to the brain and heart, which is the main goal of CPR. Each compression must be deep enough to create pressure that can circulate blood, ideally at a rate of 100 to 120 compressions per minute. Moreover, the compressions should be delivered at an appropriate depth—generally around 5 to 6 centimeters (2 to 2.5 inches) in adults.

Inconsistent compressions can lead to incomplete circulation, reducing the chances of survival and recovery. If the rhythm is erratic or the depth fluctuates, it can interrupt the flow of blood and may result in ineffective perfusion, making the resuscitative efforts significantly less effective.

While correct hand placement is also important to ensure compressions are delivered effectively, without the consistency in rhythm and depth, even the best hand placement will not compensate for poor quality compressions. Frequent pauses for breath checks can disrupt the flow of compressions, and solely relying on chest compressions without ventilation may not be appropriate for all situations, particularly in respiratory arrest scenarios. Thus, achieving and maintaining a consistent rhythm and depth of compressions is the critical