What is considered a key factor in performing chest compressions?

A key factor in performing chest compressions effectively is ensuring that the shoulders are in line with the hands. This alignment helps to maximize the force applied to the chest during compressions. When the shoulders are properly positioned, it allows for a more effective transfer of energy, which is crucial in maintaining adequate blood circulation during cardiopulmonary resuscitation (CPR).

This technique also helps prevent fatigue in the rescuer, making it easier to perform high-quality compressions over an extended period. The correct positioning contributes to efficiency and effectiveness, increasing the likelihood of successful resuscitation.

In contrast, the other options do not align with the best practices for performing compressions. Compressing to a depth of 4 inches is too deep as current guidelines recommend a depth of at least 2 inches but not exceeding 2.4 inches for adults. Performing at a slow pace compromises the effectiveness of compressions; the recommended rate is 100 to 120 compressions per minute. Lastly, placing elbows on the ground for support is not advisable, as it can restrict movement and affect the ability to deliver consistent compressions.