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Practical value of echo Doppler evaluation of aortic and mitral stenosis: a comparative study with cardiac
1Department of Cardiovascular Medicine, Henry Ford Hospital, Detroit, MI 48202.
Insights
Doppler echocardiography reliably assesses aortic and mitral valve stenosis, showing good correlation with cardiac catheterization for gradients and valve areas. This noninvasive method is accurate in clinical settings.
Area of Science:
- Cardiology
- Medical Imaging
- Diagnostic Techniques
Background:
- Valvular stenosis diagnosis traditionally relies on invasive cardiac catheterization.
- Echocardiography offers a noninvasive alternative, but its accuracy for stenosis assessment requires validation.
Purpose of the Study:
- To compare the diagnostic accuracy of Doppler echocardiography with cardiac catheterization in evaluating aortic and mitral valve stenosis.
- To assess the reliability of Doppler echocardiography in determining pressure gradients and valve areas.
Main Methods:
- Retrospective analysis of 67 patients undergoing 76 cardiac catheterization procedures.
- Comparison of Doppler-derived gradients and valve areas with catheterization measurements.
- Analysis of factors influencing Doppler accuracy, including rhythm, regurgitation, and cardiac index.
Main Results:
- Good correlation between Doppler and catheterization gradients for aortic stenosis (R=0.78 peak, 0.77 mean).
- Well-correlated aortic valve areas calculated by Doppler (simplified continuity equation) and catheterization (Gorlin equation) (R=0.80).
- Moderate correlation for mitral stenosis gradients (R=0.58) and good agreement for valve areas.
Conclusions:
- Doppler echocardiography is a reliable, noninvasive tool for assessing aortic and mitral valve stenosis.
- The accuracy of Doppler echocardiography is not significantly affected by cardiac rhythm, regurgitation, or cardiac index.
- This technique is suitable for routine clinical use by multiple interpreters.
Abstract:
This retrospective analysis compares data derived by echocardiography and cardiac catheterization in the evaluation of aortic and mitral valve stenosis. Sixty-seven patients, aged 69 +/- 12 years, underwent 76 catheterization procedures. In all studies the Doppler recording was technically adequate. In 64 studies of patients with aortic stenosis, correlation was good between the gradient obtained at catheterization (peak 51 +/- 28 mm Hg, mean 48 +/- 24 mm Hg) and the Doppler gradient (peak 73 +/- 29 mm Hg, mean 41 +/- 17 mm Hg) (R = 0.78 peak, 0.77 mean). In 15 studies the aortic valve area, 0.8 +/- 0.2 cm2, calculated by the simplified continuity equation, correlated well with the catheterization valve area, 0.7 +/- 0.3 cm2, calculated by the Gorlin equation (R = 0.80). In 14 studies in mitral stenosis patients, the mean gradient at catheterization was 11 +/- 5 mm Hg compared to the Doppler gradient of 8 +/- 4 mm Hg (R = 0.58). The mitral valve area was 1.1 +/- 0.3 cm2 by the Gorlin equation and 1.2 +/- 0.3 cm2 by echo Doppler, using pressure half-time. When cardiac rhythm, the presence and severity of regurgitation, and the cardiac index were analyzed, none was shown to have demonstrable influence on the accuracy of the Doppler study. Doppler echocardiography can be used reliably to assess valvular stenosis in a clinical, noninvasive laboratory where routine tests are performed and interpreted by more than one individual.