5. Perform 30 chest compressions. Press down with both hands directly over the breastbone to perform a compression, which helps the heart beat. Chest compressions are more critical for correcting abnormal heart rhythms (ventricular fibrillation or pulseless ventricular tachycardia, heart rapidly quivering instead of beating).
You should press down by about 2 inches (5 cm).
Do the compressions in a relatively fast rhythm. Some agencies recommend doing compressions to the beat of the chorus of "Stayin' Alive," a 1970s disco hit, or at roughly 100 beats per minute.