Relationship of Aortic Valve Area by the Use of Gorlin's Formula to That by Noninvasive and Invasive Techniques
Linear regression of the aortic valve areas by echocardiographic (echo) methods and Hakki's formula (x-axis) with that by Gorlin's equation (y-axis). Center line (yellow)represents the regression line, 95% confidence intervals for the mean (interrupted yellow, inner bounds), and 95% confidence intervals for the individuals (red, interrupted, outer bounds). Reprinted, with permission, from Gutierrez-Chico et al (10). 2D = 2-dimensional; 3D = 3-dimensional.