What are the three methods of CPR?

During CPR, a compression point is needed. There are normally three ways to locate this compression point: First, select the midpoint of the patient's nipple line, which is generally suitable for thin people. Second, select the intersection of the patient's lower 1/3 sternum. Third, the rescuer slides the index finger and middle finger of the left hand along the costal arch to the junction of the costal arch on both sides, that is, the lower chest notch, and then places the index finger and middle finger horizontally above the lower sternum notch. The sternum above the index finger is the pressing point in the middle.