Given the electrocardiogram tracing below for a client who is unresponsive and without a pulse, what should be the nurse’s priority action?

Choice A rationale
A 59-year-old patient with unstable angina who has just returned from a percutaneous coronary intervention (PCI) should be prioritized for assessment. PCI is a procedure to open blocked or narrowed coronary arteries and can lead to complications such as re-occlusion of the artery or bleeding from the catheter insertion site. Furthermore, unstable angina is a condition that can progress to myocardial infarction if not managed effectively.
Choice B rationale
A 56-year-old patient with variant angina due to receive nifedipine (Procardia) requires monitoring, but is not the highest priority. Variant angina is a form of angina that occurs at rest, often with severe pain, but it is usually well-controlled with medications like nifedipine.
Choice C rationale
A 65-year-old patient who had a myocardial infarction (MI) 4 days ago and is anxious about discharge planned for today is a lower priority for assessment. While it’s important to address the patient’s anxiety and provide education about post-discharge care, this patient is not in immediate danger.
Choice D rationale
A 39-year-old patient with pericarditis complaining of sharp, stabbing chest pain requires assessment, but is not the highest priority. Pericarditis is inflammation of the pericardium, the sac-like covering of the heart, and while it can cause severe pain, it is not typically life- threatening.

Choice A rationale
Stable angina typically occurs with exertion and goes away with rest. The symptoms described, including substernal pain, discomfort in the left shoulder and jaw, which subside with rest, are characteristic of stable angina.
Choice B rationale
Prinzmetal angina, also known as variant angina, is a type of angina (chest pain) caused by spasms in the coronary arteries. These spasms occur most often in coronary arteries that have not become hardened due to plaque buildup. However, they can also occur in hardened arteries. The symptoms can be similar to those of stable angina, but the typical triggers for the episodes are different.
Choice C rationale
A myocardial infarction (MI), or heart attack, occurs when one of the coronary arteries becomes blocked, often by a blood clot, causing part of the heart muscle to be damaged or die. The symptoms are usually more severe than what is described and do not typically subside with rest.
Choice D rationale
Unstable angina is a condition in which the angina symptoms become more severe, occur more frequently, or occur at rest. This is a medical emergency as it can often lead to a heart attack.