Final answer:
Unstable angina is angina in which pain occurs during rest, lasts more than 15 minutes, and is of new onset. It is more dangerous and may be a sign of an imminent heart attack. This type of chest pain is not relieved by rest or nitroglycerin.
Step-by-step explanation:
Unstable angina is angina in which pain occurs during rest, lasts more than 15 minutes, and is of new onset. It is more dangerous and may be a sign of an imminent heart attack. This type of chest pain is not relieved by rest or nitroglycerin.
Therefore, the answer that is most consistent with a person presenting with unstable angina is 3) Chest pain that occurs at rest and is not relieved by nitroglycerin.