New echocardiographic method for chronic aortic regurgitation: diastolic retrograde ratio in the descending aorta by...

Area of Science:

• Cardiovascular Imaging
• Echocardiography
• Hemodynamics

Background:

• Aortic regurgitation (AR) severity assessment is crucial for patient management.
• Current methods involve integrative approaches like vena contracta width (VCW), jet width to left ventricular outflow tract (LVOT) ratio, and effective regurgitant orifice area (EROA).
• There is a need for simple, accurate quantitative parameters for AR assessment.

Purpose of the Study:

• To evaluate the diagnostic performance of the diastolic retrograde ratio in the descending aorta using vector flow mapping (VFM) for assessing AR severity.
• To compare the retrograde ratio with conventional echocardiographic parameters for AR assessment.

Main Methods:

• Vector flow mapping (VFM) and conventional Doppler echocardiography were performed in 73 patients with AR and 40 controls.
• The diastolic retrograde ratio was calculated as the quotient of backward flow volume (VFb) and forward flow volume (VFf) in the descending aorta using VFM.
• AR severity was independently assessed using VCW, jet width/LVOT ratio, and EROA.

Main Results:

• The diastolic retrograde ratio significantly increased with AR severity (absent, mild, moderate, severe).
• The retrograde ratio showed strong correlations with VCW (r=0.930), jet width/LVOT ratio (r=0.884), and EROA (r=0.927).
• The retrograde ratio demonstrated high diagnostic accuracy for severe AR (Area Under Curve = 0.958), with specific thresholds showing high sensitivity and specificity.

Conclusions:

• The diastolic retrograde ratio measured by VFM is a valuable, accurate, and simple quantitative parameter for assessing AR severity.
• This parameter should be integrated into the comprehensive evaluation of patients with aortic regurgitation.
• VFM-derived retrograde ratio offers a promising tool for non-invasive AR assessment.