Hakki Valve Area (Simplified Gorlin)
Estimates a stenotic aortic or mitral valve area with the Hakki formula, a bedside simplification of the Gorlin equation.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Valve
- Aortic
- Cardiac output
- 5 L/min
- Pressure gradient across the valve
- 64 mmHg
Result: Estimated aortic valve area 0.63 cm2: cardiac output 5 L/min divided by the square root of a 64 mmHg gradient.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Valve
- Cardiac output
- Pressure gradient across the valve
How this is calculated
Citation
Hakki AH, Iskandrian AS, Bemis CE, et al. A simplified valve formula for the calculation of stenotic cardiac valve areas. Circulation. 1981;63(5):1050-1055. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.