choking first aid. heimlich maneuver procedure to remove a foreign

heimlich emergency first distress choking obstruction eating maneuver aid breathing resuscitate windpipe swallowing wheezing backslaps unconscious cardiopulmonary airways technique prevent blocked dislodge rescuer gagging difficulty thrusts safe training consciousness compression health medical hand trachea throat accident resuscitation life treatment coughing procedure remove foreign object person instruction baby infant newborn