If the choking (窒息的) individual (个人) becomes unconscious (不省人事), position the person on his or her back. Kneeling astride (跨着) the person, place your hands at the base of the rib (肋骨) cage. The heel (跟部) of one hand should be down, the fingers of the upper hand between those of the lower, grasping the palm. From this position deliver five quick upward thrusts (力推) to the abdomen (腹部) until the obstructing (障碍的) object is dislodged (驱逐).