ECHONOMY Tools for Echocardiographic Calculations Muhamed Saric, MD, PhD
New York University
estimate pulmonary artery wedge pressure (PAWP) from mitral blood and annular tissue
Doppler velocities in early diastole.
Mitral annular e' velocity can be
measure at either medial (septal) or lateral annulus in the apical 4-chamber
view. However, bear in mind that published data on E/e' ratio (LAP normal if
E/e' < 8; LAP elevated if E/e' > 15) are based on the medial e'
Peak mitral inflow E velocity:
Peak mitral annular e' velocity:
(by full regression formula)
(by short-cut formula)
8 - 15
Full regression equation formula:
= 1.9 + 1.24 * E/e'
PAWP = 4 + E/e'
Nagueh SF, Middleton KJ, Kopelen
HA, Zoghbi WA, Quinones MA. Doppler tissue imaging: a noninvasive technique
for evaluation of left ventricular relaxation and estimation of filling
J Am Coll Cardiol 1997; 30:1527-33.