Which of the following statements regarding angina pectoris is true?

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Angina pectoris is chest pain or discomfort that occurs when the heart muscle doesn't receive enough oxygen-rich blood. It can be brought on by exertion or stress because both increase the heart's need for oxygen-rich blood. Over-the-counter medications are not effective for treating angina, and it is not always relieved by rest or nitroglycerin. Angina pectoris results in temporary death of a small portion of myocardium, whereas a heart attack results in permanent death of a larger portion of myocardium. The duration of angina episodes vary but are typically shorter than 30 minutes.

Which of the Following Statements Regarding Angina Pectoris Is True