What is the most critical step when dealing with a choking adult?

When addressing a choking adult, administering abdominal thrusts is considered the most critical step because it directly addresses the obstruction causing the choking. Abdominal thrusts, also known as the Heimlich maneuver, create an upward pressure that can dislodge the object blocking the airway. This action is essential in restoring airflow and preventing further complications such as unconsciousness or death.

While encouraging the person to cough is a good initial response when they are able to, it may not be sufficient in cases of severe choking where the airway is completely obstructed. Back blows can be helpful but are generally used as a supplementary technique rather than the primary method for severe choking. Calling for emergency services, while important in a comprehensive response plan, is not the immediate action to take when a person's life is at risk due to choking. Prioritizing abdominal thrusts helps quickly alleviate the danger posed by the obstruction.