What should you do if your first CPR rescue breath doesn't enter the person's lungs?

When administering CPR, if the first rescue breath does not enter the person's lungs, it is crucial to ensure a proper airway is established before proceeding. Performing a head tilt/chin lift helps open the airway by repositioning the tongue and ensuring that there are no obstructions preventing airflow. This maneuver is essential because it can correct any positional issues that might be hindering the effectiveness of the breaths.

After repositioning the head, attempting a second rescue breath gives the responder the opportunity to see if the air can now enter the lungs. This step is taken before considering other actions, such as checking for obstructions or performing compressions, as it is vital to establish effective ventilation when possible.

In contrast, performing abdominal thrusts may not be appropriate as a first response, since this technique is typically reserved for visible choking situations where an object is obstructing the airway. Checking for an obstruction in the mouth could be a step if the breath is still unsuccessful, but the head tilt/chin lift should be attempted first to maximize the chances of effective ventilation. Continuing with compressions without addressing the inability to deliver breaths can compromise the overall effectiveness of the CPR being performed, as breathing is a key component of resuscitation.