Abstract
The variability of the interpretation by two individuals of a combined echocardiographic and Doppler method of calculating output was studied in 30 normal adults. In each subject three separate cardiac cycles were recorded to calculate maximal mitral valve orifice, the ratio of mean to maximal mitral valve leaflet separation, and the mean flow velocity through the mitral valve. The recordings were digitised twice by two independent observers. Estimates of cardiac output ranged from 3.2 to 8.11 1/min. Analysis of variance showed that interobserver and intraobserver variability for these measurements was 5.8% and 6.1% respectively. It is concluded that the reproducibility for interpreting this non-invasive method is adequate for clinical use in adults with cardiac outputs within the normal range.
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Selected References
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- Felner J. M., Blumenstein B. A., Schlant R. C., Carter A. D., Alimurung B. N., Johnson M. J., Sherman S. W., Klicpera M. W., Kutner M. H., Drucker L. W. Sources of variability in echocardiographic measurements. Am J Cardiol. 1980 May;45(5):995–1004. doi: 10.1016/0002-9149(80)90168-x. [DOI] [PubMed] [Google Scholar]
- Fisher D. C., Sahn D. J., Friedman M. J., Larson D., Valdes-Cruz L. M., Horowitz S., Goldberg S. J., Allen H. D. The mitral valve orifice method for noninvasive two-dimensional echo Doppler determinations of cardiac output. Circulation. 1983 Apr;67(4):872–877. doi: 10.1161/01.cir.67.4.872. [DOI] [PubMed] [Google Scholar]
- Lewis J. F., Kuo L. C., Nelson J. G., Limacher M. C., Quinones M. A. Pulsed Doppler echocardiographic determination of stroke volume and cardiac output: clinical validation of two new methods using the apical window. Circulation. 1984 Sep;70(3):425–431. doi: 10.1161/01.cir.70.3.425. [DOI] [PubMed] [Google Scholar]
- Loeber C. P., Goldberg S. J., Allen H. D. Doppler echocardiographic comparison of flows distal to the four cardiac valves. J Am Coll Cardiol. 1984 Aug;4(2):268–272. doi: 10.1016/s0735-1097(84)80212-0. [DOI] [PubMed] [Google Scholar]
- Valdes-Cruz L. M., Horowitz S., Mesel E., Sahn D. J., Fisher D. C., Larson D., Goldberg S. J., Allen H. D. A pulsed Doppler echocardiographic method for calculation of pulmonary and systemic flow: accuracy in a canine model with ventricular septal defect. Circulation. 1983 Sep;68(3):597–602. doi: 10.1161/01.cir.68.3.597. [DOI] [PubMed] [Google Scholar]