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Quantification of mitral valvular incompetence
Insights
Diagnosing mitral incompetence can be done using the regurgitant index (RI) via dye dilution curves or regurgitant fraction (RF) via angiocardiography. Cineangiocardiography is less reliable due to subjectivity.
Area of Science:
- Cardiology
- Medical Imaging
- Hemodynamics
Background:
- Mitral incompetence diagnosis requires accurate assessment of valvular function.
- Existing diagnostic methods vary in reliability and objectivity.
Purpose of the Study:
- To evaluate the diagnostic value of three techniques for assessing mitral incompetence.
- To compare indicator dilution curves, left ventricular volumes, and cineangiocardiography.
Main Methods:
- Analyzed hemodynamic and angiographic data from 147 individuals (100 with mitral incompetence, 47 normal).
- Assessed mitral incompetence using regurgitant index (RI) from indicator dilution curves and regurgitant fraction (RF) from left ventricular volumes.
- Utilized cineangiocardiography in a subset of patients for comparison.
Main Results:
- Both RI and RF effectively distinguished between normal individuals and those with mitral incompetence.
- Severe mitral incompetence correlated with RI >35% and RF >55%.
- Cineangiocardiography proved subjective and less useful for quantification.
Conclusions:
- Indicator dilution curves (RI) and left ventricular volumes (RF) are valuable tools for diagnosing mitral incompetence.
- Cineangiocardiography's subjectivity limits its utility in quantifying mitral incompetence severity.
- Further research may refine hemodynamic assessments for more precise quantification.
Abstract:
The hemodynamic and angiographic data of 147 individuals were analyzed in an attempt to assess the value of three techniques used in the diagnosis of mitral incompetence. One hundred patients had clinical evidence of mitral incompetence (group A) and 47 had normal hemodynamics (group B). The degree of mitral incompetence was assessed in all 147 individuals by two methods: determination of a regurgitant index (RI) using indicator dilution curves and determination of a regurgitant fraction (RF) using left ventricular volumes. In 26 patients of group A and 26 individuals in group B mitral incompetence was also assessed by cineangiocardiography. Each of these methods was compared with the clinical and hemodynamic evidence of mitral valvular incompetence. Both the determination of RI by dye dilution curves and RF by angiocardiography were found to be useful in separating normal individuals from patients with mitral valvular incompetence. Severe mitral incompetence is associated with an RI greater than 35% and with an RF greater than 55%. The degree of incompetence by either method was not well correlated with any independent hemodynamic variable. The use of cine angiocardiography to quantify the degree of mitral incompetence was found to be too subjective, depending on the observer, and thus less useful.