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- W2313833245 abstract "This study was performed to establish the normal values and range of variability for three- and jive-segment regional ejec tion fraction analysis. In addition, file conversion was utilized to compare global values produced by different vendors' sys tems. Global values show considerable diffirences between systems (15%-20% in most cases) which indicate the need for standardization and correction when comparing data. For regional analysis, with a mean global value of 60.6%, the mean regional ejection fractions varied from 47% to 81%. Interobserver variation of the regional parameters was between 2% and 6% (standard error of estimate) for a group of 50 normals (global ejection fraction >50%) with least varia bility in the apex and maximum in the septal segment. In traobserver variability was between 1% and 4% with the same pattern. In a mixed population (global ejection fraction 10%85%) all parameters exhibited more variability, and paying strict attention to patient positioning for repeat studies ap pears to have little effect on reducing this variation." @default.
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- W2313833245 date "1991-06-01" @default.
- W2313833245 modified "2023-09-26" @default.
- W2313833245 title "Factors of Variability in the Radionuclide Evaluation of Global and Regional Left Ventricular Ejection Fraction" @default.
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