A nurse is teaching a client who has angina about nitroglycerin sublingual tablets. Which of the following statements should the nurse include in the teaching?

A) "This medication decreases chest pain by dissolving blood clots that are occluding the arteries.": This statement is incorrect because nitroglycerin does not dissolve blood clots. Instead, it works by relaxing and dilating blood vessels, which helps improve blood flow to the heart muscle and relieve angina. B) "Place one tablet under your tongue every 15 minutes and repeat up to 5 times for relief of chest pain.": This is not accurate; while nitroglycerin can be taken sublingually, the typical recommendation is to take one tablet every 5 minutes as needed for chest pain, not every 15 minutes, and not to exceed 3 tablets within 15 minutes. C) "This medication is the first-line treatment for hypertension.": Although nitroglycerin can lower blood pressure, it is not typically considered a first-line treatment for hypertension. It is primarily used for angina relief rather than as a primary antihypertensive agent. D) "This medication dilates cardiac blood vessels to deliver more oxygen to the heart.": This statement accurately describes the action of nitroglycerin. By dilating the coronary arteries, nitroglycerin increases blood flow and oxygen delivery to the heart muscle, which helps alleviate angina symptoms. This is a key point to emphasize during patient education.