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Accuracy of computer-based quantification of aortic valve stenosis
W A Schöbel1, W Voelker, S Obergfell
1Department of Cardiology, University of Tübingen, Germany. wgschoeb@med.uni-tuebingen.de
Catheterization and Cardiovascular Diagnosis
|May 26, 1998
Summary
This study validates the accuracy of fluid-filled catheters and computerized calculations for quantifying aortic stenosis. The findings confirm this conventional method is reliable for patients in sinus rhythm without significant aortic regurgitation.
Area of Science:
- Cardiology
- Medical Devices
- Diagnostic Techniques
Background:
- Aortic valve stenosis quantification typically uses fluid-filled catheters and computer programs.
- The accuracy of this standard method requires validation against more direct pressure measurements.
Purpose of the Study:
- To compare the accuracy of conventional fluid-filled catheter measurements with simultaneous micromanometer catheter recordings for aortic stenosis quantification.
- To assess the validity of computerized aortic valve area calculations.
Main Methods:
- Simultaneous left and right heart catheterization was performed in 19 patients.
- Measurements included peak systolic pressures, peak-to-peak gradients, mean pressure gradients, and aortic valve areas.
- Data from fluid-filled catheters were compared to micromanometer catheter data and manual planimetry.
Main Results:
- Fluid-filled catheters slightly overestimated peak systolic pressures but yielded identical peak-to-peak pressure gradients compared to micromanometers.
- Mean pressure gradients and aortic valve areas calculated by both methods were statistically identical.
- High correlation coefficients (r=0.983 for gradients, r=0.935 for areas) were observed.
Conclusions:
- The conventional method using fluid-filled catheters and computerized analysis is accurate for quantifying aortic stenosis.
- This technique is validated for patients in sinus rhythm and without significant aortic regurgitation.