A patient with valvular heart disease comes to the emergency department with reports of syncope and dyspnea on exertion. The nurse suspects

Explanation

• Aortic stenosis refers to the narrowing of the aortic valve. This causes reduced cardiac output and increased left ventricle pressure.

• With exertion, the heart cannot increase cardiac output because of a narrow aortic valve. This can cause syncope due to insufficient perfusion to the brain when it needs the extra oxygen. Syncope is a hallmark sign of aortic stenosis.

• Incorrect: Aortic regurgitation, mitral stenosis, and mitral regurgitation do not cause syncope.

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