Patient selection: mechanical ventilation with shock and/or respiratory failure
Method: Doppler tissue imaging (DTI) during transesophageal echocardiography with color M-mode
Goal: prediction of a PAOP <= 18 mm Hg
Measures:
(1) E = mitral E wave velocity, in cm/s
(2) E' = early diastolic velocity, in cm/s
(3) Vp = propagation velocity of early diastolic blood flow within the left ventricle, in cm/s
Parameters diagnostic of the target PAOP (specificity 100%):
(1) E/Vp ratio (from DTI lateral mitral ring) <= 1.7
Parameter associated with target PAOP (specificity 88%):
(1) lateral E to E' ratio (from color M-mode propagation velocity) <= 8.0
According to Table 5, a PAOP > 18 mm Hg was associated with:
(1) E to E' lateral ratio >= 10.6
(2) E/Vp ratio >= 3.0
