The Heimlich maneuver is a procedure in which air in the lungs is used to expel a piece of food that obstructs the opening to the trachea.

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The Heimlich maneuver involves applying pressure to the abdomen to create an artificial cough and expel an obstruction in the trachea, such as a piece of food. It does not involve using air from the lungs to expel the obstruction.

The Heimlich Maneuver Is a Procedure in Which Air in the Lungs