With the progress of Doppler and modern computer technology, I believe that only a few RBCs’ leaking will be needed to give us a much understandable and clear regurgitation curve. Theoretically, merely a short part of the curve is enough to calculate the Tau. As long as we are allowed to choose 3 points from within the definition field, we can use the updated formulas to proceed. Let’s assume the 3 points are a (v

_{a}, t_{a}), b (v_{b}, t_{b}) and c (v_{c}, t_{c}) from left to right. The updated formulas are:
It is a small step in mathematics, but a true stride in cardiac clinic.

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