If the chest does not rise after the first breath, what is a likely reason?

When the chest does not rise after the first breath during rescue breathing, it often indicates that the airway is obstructed by an object. This obstruction could be due to food, vomit, or any foreign object that is preventing air from entering the lungs effectively. It is essential to identify and resolve this blockage to allow for adequate airflow and effective ventilation.

Although receiving insufficient airflow can be a factor, in the context of immediate first aid, a blocked airway is a more critical and likely scenario when breath does not result in chest rise. Rapid breaths or the emotional state of the person are less directly related to the physical mechanics of airflow and are generally not the most immediate concerns when addressing the failure of the chest to rise.