Inconsistent echocardiographic grading of aortic stenosis: is the left ventricular outflow tract important?
Michelena HI, Margaryan E, Miller FA, Eleid M, Maalouf J, Suri R, Messika-Zeitoun D, Pellikka PA, Enriquez-Sarano M. Inconsistent echocardiographic grading of aortic stenosis: is the left ventricular outflow tract important? Heart. 2013 Jul; 99(13):921-31.