Fig. 1From: A hybrid approach for quantifying aortic valve stenosis using impedance cardiography and echocardiographyCorrelation between AVA determined using catheterization data and using the hybrid approach. Catheterization valve areas were calculated using the standard continuity equation; the AVA derived by the hybrid approach was calculated with the equation AVA = SV/transaortic VTI. (r = .76, p < .0001). Abbreviations: AVA; aortic valve area, SV; stroke volume, VTI; velocity-time integralBack to article page