Following a cardiac catheterization, if a client experiences unrelieved chest pain after taking nitroglycerin, what is the most immediate action the nurse should take?

The most immediate action a nurse should take when a client experiences unrelieved chest pain after taking nitroglycerin is to call an ambulance to transport the client to the emergency department. This response is critical because unrelieved chest pain can indicate a potentially life-threatening condition, such as myocardial infarction (heart attack) or severe angina.

In this context, time is of the essence. Chest pain that does not respond to nitroglycerin may signify that the patient's condition is deteriorating. Prompt transportation to a medical facility where advanced interventions can be initiated is essential to address the underlying cardiac issue.

The other actions, such as contacting a family member, administering additional nitroglycerin, or determining the client's history of anxiety, may delay necessary medical intervention. While these options may be relevant in different circumstances, they do not address the urgent need for immediate medical evaluation and treatment that the situation demands. In critical care situations like this, mobilizing emergency services to ensure that the client receives appropriate care as soon as possible is the priority.