What cross-sectional area threshold prompts aortic valve replacement in bicuspid valve disease?

• A. 0.8 cm2
• B. 1.0 cm2
• C. 1.5 cm2
• D. 2.0 cm2

Answer: (B)

The main idea here is how we judge when to replace a bicuspid aortic valve based on how narrow the valve opening is. The key measurement is the aortic valve area: as stenosis worsens, this area shrinks. In severe aortic stenosis, the valve area is 1.0 cm² or less. This threshold is used to decide that valve replacement is needed, especially when the patient has symptoms or there are signs of adverse heart effects. In bicuspid disease, the same criterion applies because the decision hinges on the degree of obstruction, not the valve’s specific anatomy. So a valve area of 1.0 cm² or smaller indicates severe stenosis that prompts replacement. A value like 0.8 cm² is even more severe, but the threshold used to trigger the indication is 1.0 cm². Values such as 1.5 or 2.0 cm² are not severe enough to prompt replacement on their own. (Note: indexed AVA, AVA adjusted for body size, can refine decision in some patients, with a threshold around 0.6 cm²/m².)