Final answer:
The nurse's best action is to notify the health care provider due to a prolonged PR interval on the ECG tracing, which could indicate a conduction problem within the heart.
Step-by-step explanation:
The nurse's best action in this situation is to notify the health care provider.
The PR interval on an electrocardiograph (ECG) tracing indicates the time it takes for the electrical signal to travel from the atria to the ventricles of the heart. The normal PR interval ranges from 0.12 to 0.20 seconds. In this case, with a PR interval of 0.24 seconds, it is prolonged, suggesting a potential conduction problem within the heart.
By notifying the health care provider, they can further evaluate the client's condition and determine if any interventions or treatment adjustments are necessary.