Mitral Stenosis II: Clinical features and Diagnostic Tests

Mitral stenosis causes exertional dyspnea that worsens to dyspnea at rest as the condition progresses. Patients also experience fatigue, palpitations, orthopnea, recurrent respiratory infections, hoarseness, and hemoptysis. These symptoms result from narrowed mitral valve restricting blood flow from the left atrium to the left ventricle.

A distinctive low-pitched, rumbling diastolic murmur best heard at the heart's apex is the characteristic sound of mitral stenosis. During cardiac examination, the patient is positioned in the left lateral decubitus position to optimize auscultation of this murmur, which indicates narrowing of the mitral valve.

Echocardiography is the primary diagnostic tool for mitral stenosis, providing detailed images of mitral valve anatomy and function. It measures the mitral valve area and calculates the pressure gradient across the valve to determine stenosis severity and guide clinical management decisions.

P mitrale appears as broad, notched P waves in lead II on an electrocardiogram, indicating left atrial enlargement caused by mitral stenosis. This finding suggests the left atrium has enlarged to compensate for restricted blood flow through the narrowed mitral valve.

Chest X-rays help identify pulmonary congestion, left atrial enlargement indicated by a straightened left heart border and double shadow on the right side, and pulmonary artery enlargement. These findings reflect the hemodynamic changes resulting from mitral valve narrowing and increased pressure in the pulmonary circulation.

Cardiac catheterization detects pressure changes within heart chambers and records pressure differences across the valves to confirm mitral stenosis diagnosis. It measures valve opening sizes and assesses hemodynamic parameters when non-invasive tests are inconclusive or surgical intervention is being considered.

Mitral stenosis causes a diastolic murmur and restricts blood flow from the left atrium to the left ventricle, whereas mitral regurgitation involves backward blood flow during systole. Understanding these distinctions helps differentiate valve pathology. Learn more about mitral regurgitation clinical features and diagnostic tests to compare presentations.