Aortic Regurgitation II: Clinical Features and Diagnostic Tests

Aortic regurgitation is often asymptomatic in its early stages. As the condition progresses, patients develop shortness of breath, fatigue, orthopnea, and paroxysmal nocturnal dyspnea. Chest pain and syncope may also occur. These symptoms reflect the heart's inability to compensate for the backward blood flow into the left ventricle.

Corrigan's pulse, also called a water hammer pulse, is a characteristic physical finding in aortic regurgitation. It presents as a bounding pulse with a rapid upstroke followed by quick collapse. This occurs due to increased stroke volume from regurgitant flow, causing forceful arterial pulsations visible or palpable at the carotid and temporal arteries, especially in patients with left ventricular hypertrophy.

A high-pitched, blowing diastolic murmur is the characteristic finding heard during auscultation of aortic regurgitation. It is best detected at the third or fourth intercostal space along the left sternal border. An Austin Flint murmur, a low-pitched rumbling sound at the apex, may also be present from the regurgitant jet striking the mitral valve.

Transthoracic echocardiography is the primary diagnostic tool for aortic regurgitation. It assesses regurgitation severity, evaluates left ventricular size and function, and identifies underlying causes such as bicuspid valve abnormalities or infective endocarditis. This non-invasive imaging provides essential information for clinical decision-making and aortic regurgitation iii medical management.

Transesophageal echocardiography is used when transthoracic echocardiography is inconclusive or when better visualization is needed. It offers superior imaging of the aortic valve, aortic root, and helps assess left ventricular hypertrophy and atrial fibrillation. This technique provides detailed anatomical information essential for comprehensive evaluation.

Chest X-ray reveals cardiomegaly, pulmonary congestion, and aortic root dilation. Electrocardiogram shows left ventricular hypertrophy, left atrial enlargement, and atrial fibrillation in advanced disease. Cardiac MRI provides detailed left ventricular function and aortic root information, while CT scan assesses the aortic root and ascending aorta, especially when aortic dissection is suspected.

Acute aortic regurgitation presents with sudden severe symptoms including profound dyspnea, chest pain, and left ventricular failure, potentially leading to cardiogenic shock. Chronic aortic regurgitation develops slowly, allowing left ventricular adaptation, with symptoms including fatigue, exertional dyspnea, orthopnea, and paroxysmal nocturnal dyspnea. The left ventricle's compensatory mechanisms determine symptom severity.