FujiFilm SonoSite Edge II User Manual page 137

MV Flow Rate in cc/sec
Oh, J.K., J.B. Seward, A.J. Tajik. The Echo Manual. 3rd ed., Philadelphia: Lippincott, Williams, and Wilkins,
(2007), p.73-76, p.210.
Flow = PISA * Va
where:
PISA = Proximal Isovelocity SurfaceArea
Va = aliasing Velocity
Pressure Gradient (PGr) in mmHG
Oh, J.K., J.B. Seward, A.J. Tajik. The Echo Manual. 3rd ed., Philadelphia: Lippincott, Williams, and Wilkins,
(2007), p.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)
PGmax = 4 * VMax
Mean Pressure Gradient (PGmean)
PGmean = Average pressure gradient during the flow period
Baumgartner, H., Hung, J., Bermejo, J., et al. "Echocardiographic Assessment of Valve Stenosis: EAE/ASE
Recommendations for Clinical Practice". Journal of American Society of Echocardiography. January 2009,
p. 4-5.
2
PG mean = sum(4v
where:
v =peak velocity at interval n
N = the number of intervals in the Riemann sum
Pressure Half Time (PHT) in msec
Oh, J.K., J.B. Seward, A.J. Tajik. The Echo Manual. 3rd ed., Philadelphia: Lippincott, Williams, and Wilkins,
(2007), p.73-74.
PHT = DT * 0.29 (time required for the pressure gradient to fall half its maximum level)
where:
DT = deceleration time
Measurement references
2
)/N
6-11