What is the best initial intervention for a patient with a complete airway obstruction?

Performing abdominal thrusts is the best initial intervention for a patient with a complete airway obstruction because it directly addresses the cause of the obstruction. Abdominal thrusts, commonly known as the Heimlich maneuver, create pressure in the abdomen that can expel the object blocking the airway. This is crucial because complete airway obstruction prevents effective breathing and can lead to loss of consciousness or death if not resolved swiftly.

Encouraging coughing is not effective in cases of complete obstruction, as the patient cannot generate airflow to produce a cough. Administering oxygen is inappropriate because it does not alleviate the blockage but instead focuses on oxygenation, which is not possible without an open airway. While calling for emergency assistance might be necessary, in a life-threatening situation like this, immediate physical intervention is critical before further help arrives. Thus, abdominal thrusts provide the necessary action to potentially relieve the obstruction urgently.