 Commotio cordis, for example, is an often lethal disruption of heart rhythm that occurs as a result of a blow to the area directly over the heart (the precordial region), at a critical time during the cycle of a heart beat causing cardiac arrest.The concept known as vibrating palm originates with the Chinese martial arts "Neijing" ("internal") energy techniques that deal with the "qi" energy and the type of force ("jin") used.It is depicted as "a technique that is part psychic and part vibratory, this energy is then focused into a wave".