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Reproducibility of quantitative two-dimensional echocardiography.
R B Himelman1, M M Cassidy, J S Landzberg
1University of California, San Francisco 94143.
American Heart Journal
|February 1, 1988
Summary
Quantitative planimetry for cardiac measurements showed that while volumes were less reproducible, ejection fraction, wall thickness, and mass demonstrated good consistency. Following a standardized protocol ensures reliable data in normal hearts.
Area of Science:
- Cardiology
- Medical Imaging
- Quantitative Analysis
Background:
- Reproducibility of quantitative planimetry is crucial for accurate cardiac assessment.
- Variability in measurements can impact clinical decisions.
- Standardization of echocardiographic techniques is essential.
Purpose of the Study:
- To assess the reproducibility of quantitative planimetry for cardiac measurements.
- To determine intertechnician and intertracer variability in echocardiographic analysis.
- To establish confidence limits for various cardiac parameters.
Main Methods:
- Three physicians performed successive two-dimensional echocardiography studies on each other.
- Left ventricular and atrial volumes, ejection fraction, mass, and wall thickness were traced using specific formulas.
- Intertechnician variability, intertracer variability, and 95% confidence limits were calculated.
Main Results:
- Measurements of cardiac volumes were less reproducible than ejection fraction, average wall thickness, and mass.
- Mean intertracer variability (15%) exceeded mean intertechnician variability (11%).
- Ninety-five percent confidence limits ranged from +/- 7% for ejection fraction to +/- 19% for left atrial volume.
Conclusions:
- Reproducible quantitative planimetry data can be obtained in normal hearts.
- A standardized protocol for quantitative imaging and planimetry is recommended.
- Careful technique and adherence to protocols can minimize variability in echocardiographic measurements.