Which method is used to quantify MR regurgitant severity from the regurgitant jet, and what parameters are required?

Which method is used to quantify MR regurgitant severity from the regurgitant jet, and what parameters are required?

• A. The PISA method uses jet area and flow convergence radius.
• B. The PISA method uses jet velocity alone.
• C. The PISA method uses flow convergence radius r, aliasing velocity, and MR jet velocity V.
• D. The PISA method relies on vena contracta width only.

Answer: (C)

The method relies on converting the flow converging toward the regurgitant orifice into a measurable flow rate using the PISA concept. You determine the radius of the flow-convergence region (r) at the aliasing surface, you note the aliasing (Nyquist) velocity used to create the color Doppler shell, and you measure the MR jet velocity (V). With these, the regurgitant flow rate is Q = 2π r^2 × Va. This flow rate then yields the effective regurgitant orifice area (EROA) as EROA = Q / V, and regurgitant volume can be obtained by multiplying EROA by the velocity-time integral of the MR jet (VTI MR). These three measurements—flow-convergence radius, aliasing velocity, and MR jet velocity—are the essential parameters for the PISA method.

The method relies on converting the flow converging toward the regurgitant orifice into a measurable flow rate using the PISA concept. You determine the radius of the flow-convergence region (r) at the aliasing surface, you note the aliasing (Nyquist) velocity used to create the color Doppler shell, and you measure the MR jet velocity (V). With these, the regurgitant flow rate is Q = 2π r^2 × Va. This flow rate then yields the effective regurgitant orifice area (EROA) as EROA = Q / V, and regurgitant volume can be obtained by multiplying EROA by the velocity-time integral of the MR jet (VTI MR).

These three measurements—flow-convergence radius, aliasing velocity, and MR jet velocity—are the essential parameters for the PISA method.