FujiFilm SonoSite Edge II User Manual page 6

Simpson's algorithm divides the LA into a series of stacked oval disks where h is the height of the stacked
disks and D1 and D2 are the orthogonal minor and major axes
1-plane Simpson's rule (method of disks)
LA Vol =π/4(h) Σ(D1) 2
Same as the 2-plane method of disks except there is an assumption that the stacked disks are circular.
The equation for the LA Vol Index is: LA Vol Index = LA Vol/BSA
MV Flow Rate in cc/sec
Oh, J.K., J.B. Seward, and A.J. Tajik. The Echo Manual. 3rd Edition, Philadelphia: Lippincott Williams and
Wilkins, (2007), 73-76, 210.
Flow = PISA * Va
where: PISA = Proximal Isovelocity SurfaceArea
Va = aliasing velocity
Pressure Gradient (PGr) in mmHG
Oh, J.K., J.B. Seward, and A.J. Tajik. The Echo Manual. 3rd Edition, Philadelphia: Lippincott, Williams, and
Wilkins, (2007), 63-66.
2
PGr = 4 * (Velocity)
Peak E Pressure Gradient (E PG)
2
E PG = 4 * PE
Peak A Pressure Gradient (A PG)
2
A PG = 4 * PA
Peak Pressure Gradient (PGmax)
2
PGmax = 4 * PV
Mean Pressure Gradient (PGmean)
Echocardiographic Assessment of Valve Stenosis: EAE/ASE Recommendations for Clinical Practice Journal
of American Society of Echocardiography, (January, 2009), 4-5.
4 Measurement publications and terminology