Aortic valve area can be calculated by using the principle of conservation of mass — "What comes in must go out".
Aortic valve area indexed to body surface area should be considered for the large and small extremes of body surface area.
For patients with prosthetic aortic valves, patient-prosthesis mismatch is suspected when effective orifice area (EOA) indexed to body surface area <0.85 to 0.9 cm2/m2. Patient-prosthesis mismatch is considered severe when EOA index <0.65.
EOA Index (cm2/m2)
Subvalvular velocity time integral (cm)
Maximum velocity time integral across the valve (cm)
Left ventricular outflow tract diameter (cm)
Weight (kg or lb)
Height (cm or in)
Aortic Valve Area (cm2)
Aortic Valve Area indexed to BSA (cm2/m2)
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