Equations

Question 1

In which scenarios would the modified Bernoulli equation be inaccurate?

Answer 1

When the LVOT velocity is not considered negligible. Eg. Anemia, thyrotoxicosis, AV fistula, severe AS because the velocity will be increased across the LVOT.

Question 2

What is the change to the modified Bernoulli equation to correct for when LVOT velocities are not negligible?

Answer 2

P=4(AVv2 -LVOTv2)

Question 3

What is the dimensionless index?

Answer 3

It is the LVOT VTI/AV VTI. Peak or mean velocity may also be substituted in the same ratio. Severe AS is considered when this ratio is