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Mitral valve resistance as a hemodynamic indicator in mitral stenosis
R W Beyer1, A Olmos, R F Bermúdez
1Cardiology Division, Wadsworth Veterans Affairs Medical Center/UCLA School of Medicine.
The American Journal of Cardiology
|March 15, 1992
Summary
Mitral valve resistance offers a more stable hemodynamic assessment for mitral stenosis compared to the Gorlin mitral area. This indicator proved valuable in evaluating patients before and after percutaneous balloon mitral dilatation.
Area of Science:
- Cardiovascular Physiology
- Medical Engineering
- Clinical Hemodynamics
Background:
- The Gorlin formula's valve area calculation shows variability in bioprosthetic and aortic valves.
- Limited data exist on the Gorlin formula's application to native mitral stenosis.
- Mitral valve resistance is a proposed alternative hemodynamic indicator for mitral stenosis.
Purpose of the Study:
- To assess the value of mitral valve resistance in mitral stenosis.
- To compare mitral valve resistance with the Gorlin mitral area.
- To evaluate hemodynamic changes after percutaneous balloon mitral dilatation.
Main Methods:
- Simultaneous left atrial and ventricular pressure recordings in 34 patients.
- Exclusion of patients with shunt or mitral regurgitation.
- Assessment of 26 patients post-percutaneous balloon mitral dilatation (PBMD).
Main Results:
- Mitral valve resistance correlated exponentially with Gorlin mitral area (p < 0.0001).
- Both Gorlin mitral area and mitral resistance improved significantly after PBMD (p < 0.001).
- Mitral resistance showed less variability than Gorlin area under pharmacologic stress (isoproterenol).
Conclusions:
- Mitral valve resistance is a valuable indicator for assessing mitral stenosis.
- Mitral resistance demonstrates greater stability than Gorlin mitral area under changing hemodynamic conditions.
- Findings support the utility of mitral resistance in clinical practice for mitral stenosis evaluation.