Rate and Depth
Push hard and fast at 100 to 120 compressions per minute. In adults, compress at least 2 inches. In children, compress about one-third of the chest depth, approximately 2 inches, and in infants about 1.5 inches. Use the heel of one hand on the lower half of the sternum for adults.
Recoil and Interruptions
Allow the chest to fully recoil between compressions, because leaning on the chest reduces venous return and coronary perfusion. Limit pauses, and aim for a chest compression fraction above 60 percent, with a target near 80 percent or higher.
Team Techniques
Switch compressors every 2 minutes to prevent fatigue, using the pause for rhythm analysis. Use a firm surface, and do not stop for ventilation if an advanced airway is in place. Ventilate once every 6 seconds during continuous compressions with an advanced airway.