LOINC long common name : Aortic valve Effective regurgitant orifice area by US.doppler Calculated by PISA method;
LOINC short name : AV EROA PISA;
LOINC description : The effective regurgitant orifice area (EROA) is the size of the defect where the
valve leaflets are not aligning normally (coaptation defect). The severity of regurgitation
is related to the EROA. Proximal isovelocity surface area (PISA) is a method for calculating
the EROA using color flow Doppler and is based on flow dynamics and the continuity
principle, which states that in the absence of a leak or additional flow into a conduit,
the flow rate will be constant along the length of the conduit, whether the conduit
is the heart or the regurgitant jet. The EROA is calculated from the flow and peak
velocity at the regurgitant orifice, where the flow is based on the radius at the
orifice and the Nyquist limit (aliasing velocity), which is the velocity at which
the color flow switches from red to blue or blue to red, and the peak velocity is
measured using continuous wave Doppler of the jet. [PMID: 17898369];
Has component