Calculate cardiac valve area (Mitral or Aortic) using the Gorlin equation.
Hemodynamic Data
mL/min
bpm
sec/beat
mmHg
Stenosis Assessment
Aortic Area0.01cm²
Severe Stenosis
Gorlin Calculation
Overview
The Gorlin formula is the gold standard for calculating cardiac valve areas (Mitral or Aortic) during invasive cardiac catheterization. It relates the flow across the valve to the pressure gradient across it.
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Pro Tips
For Aortic valve, use the Systolic Ejection Period (SEP) as the filling period.
For Mitral valve, use the Diastolic Filling Period (DFP) as the filling period.
The formula is flow-dependent; inaccurate CO measurements will results in an inaccurate valve area.
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Fun Facts
"A normal Aortic Valve Area (AVA) is 3.0 to 4.0 cm²."
"A normal Mitral Valve Area (MVA) is 4.0 to 6.0 cm²."
"Severe aortic stenosis is typically defined as an AVA < 1.0 cm²."
"Severe mitral stenosis is typically defined as an MVA < 1.5 cm²."
Formula: Area = (CO / (HR * FP)) / (Constant * √Gradient). Constant is 44.3 (Aortic) or 37.7 (Mitral).
