ECHONOMY Tools for Echocardiographic Calculations Muhamed Saric, MD, PhD
New York University
estimate pulmonary artery wedge pressure (PAWP) from two different mitral blood
velocities: peak E wave velocity by pulsed Doppler, and flow propagation
velocity (Vp) by color M mode.
For Vp, place color box over zoomed
LV in the apical 4-chamber view. Place the Doppler cursor along the mitral
inflow. Turn on the color; set the Nyquist limit to about 40-50 cm/sec.
Measure the acceleration slope of the early diastolic flow.
Peak mitral inflow E velocity:
Flow propagation velocity (Vp):
(Normal Vp: > 55 in young; >45 in old people)
= 4.6 + 5.27 * E/Vp
Garcia MJ, Ares MA, Asher C,
Rodriguez L, Vandervoort P, Thomas JD. An index of early left ventricular
filling that combined with pulsed Doppler peak E velocity may estimate
capillary wedge pressure.
J Am Coll Cardiol 1997;29:448-54