Final answer:
Intubation is the most appropriate next step to secure the airway and provide mechanical assistance with breathing for a full-term newborn with a heart rate less than 60 beats per minute despite positive pressure ventilation.
Step-by-step explanation:
Intubation is the most appropriate next step to secure the airway.
When a full-term newborn has a heart rate less than 60 beats per minute despite 30 seconds of positive pressure ventilation that moves the chest, it indicates a significant issue with the respiratory system. Intubation involves inserting a long, plastic tube into the respiratory system to bypass any obstructed areas and allow air to reach the lungs. This procedure is necessary to provide mechanical assistance with breathing and ensure the newborn receives adequate oxygen.