aortic valve area
The calculated opening area of the aortic valve, measured in square centimeters, used to assess the severity of aortic stenosis.
Full Definition
Aortic valve area (AVA) is a critical hemodynamic parameter calculated during echocardiography or cardiac catheterization to quantify the effective opening of the aortic valve. Normal AVA ranges from 3.0-4.0 cm², with severe aortic stenosis typically defined as AVA <1.0 cm². The calculation involves measuring pressure gradients and flow velocities across the valve. Accurate measurement is essential for determining surgical intervention timing and requires careful attention to flow conditions and measurement techniques.
Usage
Usage note: Always specify units (cm²) and ensure consistency between different measurement methods in the same report.
In Context
- "The aortic valve area was calculated at 0.8 cm², consistent with severe aortic stenosis." — Echocardiography report
- "Planimetry showed an aortic valve area of 1.2 cm², suggesting moderate stenosis." — Cardiac catheterization report