An enjoyable reunion of old friends at your home has just ended and you are accompanying them to the door. As you return to the living room a short moment later, you find your 2-year-old son John coughing next to the sofa. Intensity and persistence of the coughing rise. After a while, John becomes exhausted, his skin turns slightly blue and the cough ceases gradually and becomes nonproductive. There's no visible sign of a foreign body present in the oral cavity. What will you do to help John?
