Which technique promotes high-quality CPR when compressing the chest?

The technique of positioning the shoulders directly over the hands during chest compressions is crucial for promoting high-quality CPR. This alignment allows the provider to use their body weight effectively, thereby generating adequate force for the compressions. By having the shoulders over the hands, the rescuer can maintain proper mechanical advantage and achieve the recommended depth and rate of compressions with minimal effort and maximum efficiency. This technique helps to ensure that the compressions are consistent and effective, which is vital for maintaining blood circulation in a patient experiencing cardiac arrest.

Other techniques, while they may seem practical, do not support the goals of high-quality CPR as effectively. For instance, resting hands on the patient's chest does not allow for the necessary force to be applied to achieve the appropriate compression depth. Similarly, using a soft surface for compressions can inhibit the depth and quality of compressions, as a firm surface is necessary to provide resistance during compressions. Keeping elbows bent can also reduce the effectiveness of the compressions, as it limits the ability to push down with full body weight and achieve the required depth.