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ECHONOMY |
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Purpose |
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| To calculate the aortic valve area
(AVA) using a simplified Gorlin equation. Original Gorlin formula calculates AVA from 5 parameters: cardiac output, mean pressure gradient, heart rate,
systolic ejection period and the constant 44.3. Hakki and colleagues realized that 44.3 * SEP * HR is approximately 1000. If the cardiac output is expressed in liters/minute (rather than in mL/min as in Gorlin eq.), AVA can be calculated using only the cardiac output (CO) and the square root of mean pressure gradient (MPG). |
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Technical Hints |
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| Make sure the cardiac output is expressed in liters per minute! | ||
Calculator |
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Cardiac output (CO) |
liters/minute |
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Mean pressure gradient (MPG): |
mm Hg |
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Answers |
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| Aortic valve area | cm2 | |
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References |
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Hakki A, Iskandrian A, Bemis C, Kimbiris D, Mintz G, Segal B, Brice C. A simplified valve formula for the calculation of stenotic cardiac valve areas. Circulation 1981;63(5):1050–5. |
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