Peripheral Signs of Severe Aortic Regurgitation
The key peripheral signs indicating severe chronic aortic regurgitation are wide pulse pressure, exaggerated arterial pulsations (Corrigan pulse), low diastolic blood pressure, and the Hill sign (popliteal-brachial systolic pressure gradient >20 mmHg), though these signs are attenuated or absent in acute AR. 1, 2
Primary Peripheral Signs
Wide Pulse Pressure and Arterial Pulsations
- Wide pulse pressure (difference between systolic and diastolic BP) is the most reliable peripheral sign for quantifying chronic AR severity 2
- Exaggerated arterial pulsations (Corrigan pulse) - bounding, collapsing pulse reflecting the wide pulse pressure 1
- Low diastolic blood pressure - results from rapid runoff of blood back into the left ventricle 2
These signs reflect the hemodynamic consequences of severe regurgitation and are among the "first and main clinical signs for quantifying" AR 2.
Hill Sign
The Hill sign - popliteal systolic BP exceeding brachial systolic BP by ≥20 mmHg - has been described as correlating with AR severity 3, 4. However, evidence quality is mixed. One study suggests it may predict angiographic severity 4, while another found it to be an artifact of sphygmomanometric measurement with no physiological basis 5. Despite controversy, it remains mentioned in guidelines as a peripheral indicator.
Additional Peripheral Signs
Duroziez Sign
Duroziez sign (femoral double intermittent murmur) - when properly performed, has approximately 90% sensitivity and nearly 100% specificity for AR diagnosis, particularly in pure AR 4. This involves hearing both systolic and diastolic murmurs over the femoral artery with gradual compression.
Other Eponymous Signs
Multiple other peripheral signs have been described historically 3, 6:
- Quincke's sign (capillary pulsations in nail beds) - not clinically useful 4
- de Musset's sign (head bobbing) - low sensitivity and specificity 4
- Landolfi sign (alternating pupillary constriction/dilation) - rare but documented 7
Important caveat: Most eponymous signs lack robust evidence despite prominent textbook support 3. Only the Corrigan pulse, Duroziez sign, and Hill sign have sufficient literature for consideration, though quality remains limited.
Critical Distinction: Acute vs. Chronic AR
Peripheral signs are markedly attenuated or absent in acute severe AR 2. This is crucial because:
- Acute AR presents with poor functional tolerance despite minimal peripheral signs
- The left ventricle has not had time to dilate and compensate
- Diagnosis relies more heavily on echocardiographic findings (premature mitral valve closure, short pressure half-time <300 ms, rapid equilibration of aortic-LV pressures) 8
Clinical Integration
When evaluating for severe chronic AR, look for:
- Wide pulse pressure (>60 mmHg suggests severity)
- Bounding peripheral pulses with rapid upstroke and collapse
- Low diastolic BP (<50 mmHg)
- Displaced, hyperdynamic LV impulse 1
These peripheral findings, combined with a diastolic murmur and echocardiographic confirmation (vena contracta >6 mm, effective regurgitant orifice area ≥30 mm², regurgitant fraction ≥50%), establish the diagnosis of severe AR 9, 10.
Remember: Peripheral signs help identify chronic severe AR but should never delay echocardiographic assessment, which remains the definitive diagnostic modality 1, 2. In acute presentations, absence of peripheral signs does not exclude severe AR 2, 8.