1. 心停止中の循環を維持するように意図した心臓のリズムのある圧迫(胸壁を通じてまたは手術中には直接心臓へのどちらかで)を行う緊急の動作(an emergency procedure that employs rhythmic compression of the heart (either through the chest wall or, during surgery, directly to the heart) in an attempt to maintain circulation during cardiac arrest)