How are the 2015 CPR guidelines different from the 2010 CPR guidelines?

The 15th edition of the CPR guidelines changed relatively little compared to the 10th edition, basically just making certain limits on the frequency and depth of chest compressions, and basically not much else.

The 2015 version of CPR still uses the CAB process, and the first step C is still cyclic, i.e., chest compressions, and the compressions are also the same 30 times, and the frequency of compressions in the current 15th edition of the guideline is at least 100 to 120 times/minute, while the depth is at least 5 centimeters, but not more than 6 centimeters. The position of compression is the lower and middle sternum, and the gap between compressions requires complete relaxation, with the palm of the hand not leaning on the chest wall. As for A, the airway remains open, and the airway is opened by tilting the head and lifting the jaw in preparation for artificial respiration.B, for artificial respiration, mouth-to-mouth artificial respiration is performed twice, blowing for more than 1 second each time (not about 1 second). This completes a cycle of compression ventilation required by the 15th edition of the guidelines.

For further detailed information it is recommended to search and read the 2015 AHA CPR Guidelines Summary.