MR: Quantification (PISA)

The global unit selector only affects unanswered questions
1.Proximal Isovelocity Hemispheric Radius from the Orifice?
2.Aliasing Velocity at the Radial Distance r?
3.Peak Velocity of the MR Jet?
4.VTI of the MR Jet?
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1. Proximal Isovelocity Hemispheric Radius from the Orifice?

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About this Calculator

The PISA method, based on the principle of conservation of flow and the continuity equation, is the best method for quantifying the ERO and the volume of MR.


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Effective mitral regurgitant orifice area: clinical use and pitfalls of the proximal isovelocity surface area method.

Journal of the American College of Cardiology 1995 March 1, 25 (3): 703-9

Utsonomiya T et al.

Doppler color flow “proximal isovelocity surface area” method for estimating volume flow rate: effect of orifice shape and machine factors. JACC 1991; 17; 1103

Zoghbi WA et al.

Recommendations for evaluation of the severity of native valvular regurgitation with two-dimensional Doppler Echocardiography.

Journal of the American Society of Echocardiography 2003, 16 (7): 777-802

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