The heart muscle, like any other muscle, consists of a huge number of muscle fibers, and they all work as a whole. For some reason, the synchronism of contraction of muscle fibers is disrupted, they begin to work inconsistently, which leads to cardiac arrest and death. With the help of a precardial stroke on the sternum, you can make the heart earn as synchronously as before. The purpose of delivering such a blow is to shake the chest as much as possible, which can become the impetus for the launch of a stopped heart. Often, a stroke restores the heartbeat and regains consciousness.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.