How to perform extra-thoracic cardiac compressions? Extrathoracic compressions are performed on the lower half of the sternum, with the pressure point located at the junction of the nipple line and the sternum in standard size patients. The patient should lie on his back on a hard bed or on the floor. The resuscitator should be close to the patient’s side of the chest, and the resuscitator can use different positions such as kneeling or padded footstool according to the height of the patient’s position. When pressing the root of the palm of one hand against the lower part of the sternum, the palm of the other hand is stacked on the back of the hand, the fingers are cocked off the chest wall, or the fingers of both hands can be crossed to lift the fingers. The resuscitator straightens both elbows and presses vertically and forcefully downward. After each compression, relax to return the sternum to the position before the compression, and do not leave the chest wall with both hands when relaxing. An effective cerebral and coronary perfusion pressure can be produced when the compression to relaxation interval ratio is 1:1.