ERO Calculator

Formula

The formula to calculate the ERO (Effective Regurgitant Orifice) is:

\[ ERO = \frac{VFR}{Vm} \]

Where:

ERO (Effective Regurgitant Orifice): A measure of the size of the opening through which regurgitation occurs in the heart.
Significance: Used in cardiology to assess the severity of valve regurgitation and guide treatment decisions.

Let's say the volume flow rate (VFR) is 100 ml/s and the maximum velocity (Vm) is 50 cm/s. Using the formula:

\[ ERO = \frac{100}{50} = 2 \]

So, the Effective Regurgitant Orifice (ERO) is 2 cm².