The nurse is preparing discharge teaching for a client following placement of a mechanical aortic valve. Which information regarding warfarin(coumadin) therapy would the nurse include? Select all that apply.

a. “The left side of your heart is having trouble overcoming the resistance in the blood vessels of your body.”

• This explanation is not specific to mitral stenosis. It describes systemic vascular resistance, which is a broader concept related to hypertension and vascular health. Mitral stenosis specifically involves narrowing of the mitral valve, which affects blood flow between the left atrium and left ventricle.

b. “When your heart beats, some of the blood that should leave the left ventricle is backing up through a leaking valve.”

• This explanation is more accurate for mitral regurgitation rather than mitral stenosis. Mitral regurgitation involves the leaking of blood backward through the mitral valve into the left atrium during ventricular systole. Mitral stenosis, on the other hand, involves narrowing or constriction of the mitral valve, which impedes the flow of blood from the left atrium to the left ventricle during diastole.

c. “The valve between your heart and lungs has become inelastic.”

• This explanation is not entirely accurate. While mitral stenosis does involve changes in the mitral valve structure, such as thickening and calcification, the term "inelastic" does not fully describe the pathology of mitral stenosis. Mitral stenosis is characterized by the narrowing (stenosis) of the mitral valve orifice, which restricts blood flow from the left atrium to the left ventricle.

d. “The mitral valve has become stiff and narrowed which slows the blood between the two chambers.”

• This explanation is the most accurate description of mitral stenosis. It correctly identifies the problem as the narrowing and stiffening (stenosis) of the mitral valve, which impedes the flow of blood from the left atrium to the left ventricle during diastole. This explanation helps the client understand how the condition affects the function of the mitral valve and the flow of blood within the heart.

a. Aortic regurgitation: Aortic regurgitation involves the backflow of blood from the aorta into the left ventricle during diastole due to a dysfunctional aortic valve. While aortic regurgitation can cause symptoms such as dyspnea and chest pain, they are typically associated with exertion rather than occurring at rest or unrelated to activity.

b. Mitral valve prolapse: Mitral valve prolapse is characterized by the abnormal movement of the mitral valve leaflets into the left atrium during systole. While mitral valve prolapse can lead to symptoms such as palpitations, chest discomfort, and dyspnea, these symptoms are usually not unrelated to activity. They are often precipitated or exacerbated by physical exertion or stress.

c. Mitral stenosis: Mitral stenosis involves narrowing of the mitral valve opening, which obstructs blood flow from the left atrium to the left ventricle. Symptoms of mitral stenosis, such as dyspnea and chest discomfort, typically occur with exertion or during periods of increased cardiac demand rather than being unrelated to activity.

d. Aortic stenosis: Aortic stenosis is characterized by narrowing of the aortic valve opening, which obstructs blood flow from the left ventricle to the aorta. This obstruction leads to increased pressure in the left ventricle and can cause symptoms such as dyspnea (due to pulmonary congestion) and chest pain (angina) even at rest. These symptoms are often exacerbated during physical activity but can occur spontaneously as well.