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How to Do the Heimlich Maneuver
Stand behind the choking person (who needs to be standing upright).
Put your hands around his or her waist, and tip the person slightly forward
Form a fist with one hand and place the thumb side of the fist just above the choking person’s bellybutton and below rib cage.
Grasp the fist with the other hand and press hard into the upper abdomen with an upward thrust, as if trying to lift the person up.
Repeat until the stuck object comes out.
Source: Mayo Clinic, The Heimlich Institute