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In order to establish a simple and accurate method for the determination ofangiocardiographic ejection fraction (EFa),the end-diastole,end-systole,the first third andthe first half of the ejection phase on cineventriculograms of the right anterior oblique 30°(RAO 30°) in 42 subjects were analyzed.We found that the percentage of total axisshortening (T%~Δa) and EFa were in positive correlation.Their linear regression equationis EFa=0.1712+1.3303T%~Δa (r=0.880) and the quadratic equation is EFa=0.0396+2.4874T%~Δa 1.9787 (T%~Δa)~2 (r~2=0.981).The EF obtained in another 10 subjects by the linearand quadratic regression equations and area-length method are 0.469±0.176,0.464±0.208and 0.482±0.208,respectively.(P>0.05).It is our opinion that the regression method issimple and the results are positively correlated with the area-length method.It can be usedas a new method for calculating EFa.
In order to establish a simple and accurate method for the determination of angiocardiographic ejection fraction (EFa), the end-diastole, end-systole, the first third and the first half of the ejection phase on cineventriculograms of the right anterior oblique 30 ° (RAO 30 °) in 42 subjects were analyzed. We found that the percentage of total axisshortening (T% ~ Δa) and EFa were in positive correlation. Their linear regression equation EFa = 0.1712 + 1.3303T% ~Δa (r = 0.880) and the quadratic The equation was EFa = 0.0396 + 2.4874T% ~ Δa 1.9787 (T% ~Δa) ~ 2 (r ~ 2 = 0.981). The EF obtained in another 10 subjects by the linearand quadratic regression equations and area-length method were 0.469 ± 0.176 , 0.464 ± 0.208 and 0.482 ± 0.208, respectively. (P> 0.05). It is our opinion that the regression method issimple and the results are positively correlated with the area-length method. It can be usedas a new method for calculating EFa.