Biomaterial Database

Determination of aortic valve area by Doppler echocardiography using the continuity equation: a critical evaluation. 1990

H Baumgartner, and H Kratzer, and G Helmreich, and P Kuehn

Second Department of Internal Medicine/Cardiology, Krankenhaus der Barmherzigen Schwestern, Linz, Austria.

In 35 patients with aortic stenosis the Doppler-derived values of the aortic valve area (continuity equation) were compared with those determined at cardiac catheterization (Gorlin's formula). The comparison of three modifications of the continuity equation showed that the procedure generally proposed (calculating the area of the left ventricular outflow tract from its diameter) significantly underestimated the valve area (modification 1). Modification 2, which used direct planimetry of the left ventricular outflow tract, yielded results quite consistent with invasive measurements. The employment of peak velocities instead of velocity-time integrals (modification 3) did not significantly alter the results. However, the scatter was considerable in all three modifications. When critical aortic stenosis was defined with a valve area less than or equal to 0.70 cm2, modifications 1, 2, and 3 accurately predicted the severity of stenosis in 80, 86, and 80%, respectively.

UI	MeSH Term	Description	Entries
D011446	Prospective Studies	Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.	Prospective Study,Studies, Prospective,Study, Prospective
D001783	Blood Flow Velocity	A value equal to the total volume flow divided by the cross-sectional area of the vascular bed.	Blood Flow Velocities,Flow Velocities, Blood,Flow Velocity, Blood,Velocities, Blood Flow,Velocity, Blood Flow
D001794	Blood Pressure	PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.	Systolic Pressure,Diastolic Pressure,Pulse Pressure,Pressure, Blood,Pressure, Diastolic,Pressure, Pulse,Pressure, Systolic,Pressures, Systolic
D006439	Hemodynamics	The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.	Hemodynamic
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001021	Aortic Valve	The valve between the left ventricle and the ascending aorta which prevents backflow into the left ventricle.	Aortic Valves,Valve, Aortic,Valves, Aortic
D001022	Aortic Valve Insufficiency	Pathological condition characterized by the backflow of blood from the ASCENDING AORTA back into the LEFT VENTRICLE, leading to regurgitation. It is caused by diseases of the AORTIC VALVE or its surrounding tissue (aortic root).	Aortic Incompetence,Aortic Regurgitation,Aortic Valve Incompetence,Regurgitation, Aortic Valve,Incompetence, Aortic,Incompetence, Aortic Valve,Insufficiency, Aortic Valve,Regurgitation, Aortic
D001024	Aortic Valve Stenosis	A pathological constriction that can occur above (supravalvular stenosis), below (subvalvular stenosis), or at the AORTIC VALVE. It is characterized by restricted outflow from the LEFT VENTRICLE into the AORTA.	Aortic Stenosis,Aortic Valve Stenoses,Stenoses, Aortic,Stenoses, Aortic Valve,Stenosis, Aortic,Stenosis, Aortic Valve,Valve Stenoses, Aortic,Valve Stenosis, Aortic
D015150	Echocardiography, Doppler	Measurement of intracardiac blood flow using an M-mode and/or two-dimensional (2-D) echocardiogram while simultaneously recording the spectrum of the audible Doppler signal (e.g., velocity, direction, amplitude, intensity, timing) reflected from the moving column of red blood cells.	Doppler Echocardiography,Echocardiography, Continuous Doppler,Echocardiography, Two-Dimensional Doppler,2-D Doppler Echocardiography,2D Doppler Echocardiography,Continuous Doppler Echocardiography,Doppler Echocardiography, 2-D,Doppler Echocardiography, 2D,Doppler Echocardiography, Continuous,Doppler Echocardiography, Two-Dimensional,Echocardiography, 2-D Doppler,Echocardiography, 2D Doppler,Two-Dimensional Doppler Echocardiography,2 D Doppler Echocardiography,Doppler Echocardiography, 2 D,Doppler Echocardiography, Two Dimensional,Echocardiography, 2 D Doppler,Echocardiography, Two Dimensional Doppler,Two Dimensional Doppler Echocardiography