AS: Aortic Valve Area (Hakki)

Estimate aortic valve area

The global unit selector only affects unanswered questions
1.Cardiac Output?
2.Peak Left Ventricular Systolic Pressure?
3.Peak Aortic Systolic Pressure?
4.Heart Rate?
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1. Cardiac Output?

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About this Calculator

The Hakki formula (with subsequent correction by Angel) relies on the ratio of peak-to-peak instantaneous gradients and thus may be non-physiologic. In mild-moderate stenosis the peak-to-peak gradient, does not reflect mean gradient however it is often close to mean gradient for severe stenosis. In general it has excellent correlation with the Gorlin equation.

The normal aortic valve area is 3-4 cm2. Symptoms tend to not be apparent until the AS is severe (<1cm2). If a patient presents with symptoms and the AVA is measured in the mild-moderate range alternative causes should be explored before attributing them to AS alone.

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