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2013 ; 17
(5
): R186
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The subxiphoid view cannot replace the apical view for transthoracic
echocardiographic assessment of hemodynamic status
#MMPMID24004960
Maizel J
; Salhi A
; Tribouilloy C
; Massy ZA
; Choukroun G
; Slama M
Crit Care
2013[Sep]; 17
(5
): R186
PMID24004960
show ga
INTRODUCTION: This prospective study aimed to assess whether use of the
subxiphoid acoustic window in transthoracic echocardiography (TTE) can be an
accurate alternative in the absence of an apical view to assess hemodynamic
parameters. METHODS: This prospective study took place in a teaching hospital
medical ICU. Over a 4-month period, TTE was performed in patients admitted for
more than 24 hours. Two operators rated the quality of parasternal, apical, and
subxiphoid acoustic windows as Excellent, Good, Acceptable, Poor, or No image. In
the subpopulation presenting adequate (rated as acceptable or higher) apical and
subxiphoid views, we compared the left ventricular ejection fraction (LVEF), the
ratio between right and left ventricular end-diastolic areas (RVEDA/LVEDA), the
ratio between early and late mitral inflow on pulsed Doppler (E/A ratio), the
aortic velocity time integral (Ao VTI), and the ratio between early mitral inflow
and displacement of the mitral annulus on tissue Doppler imaging (E/Ea ratio).
RESULTS: An adequate apical view was obtained in 80%, and an adequate subxiphoid
view was obtained in 63% of the 107 patients included. Only 5% of patients
presented an adequate subxiphoid view without an adequate apical view. In the
subpopulation of patients with adequate apical and subxiphoid windows (n = 65),
LVEF, E/A, and RVEDA/LVEDA were comparable on both views, and were strongly
correlated (r > 0.80) with acceptable biases and precision. However, the Ao VTI
and the E/Ea ratio were lower on the subxiphoid view than on the apical view (18
± 5 versus 16 ± 5 cm and 9.6 ± 4.6 versus 7.6 ± 4 cm, respectively, P = 0.001 for
both). CONCLUSIONS: An adequate TTE subxiphoid window was obtained in fewer than
two thirds of ICU patients. In addition to the classic indication for the
subxiphoid window to study the vena cava and pericardium, this view can be used
to study right and left ventricular morphology and function, but does not provide
accurate hemodynamic Doppler information. ICU echocardiographers should therefore
record both apical and subxiphoid views to assess comprehensively the cardiac
function and hemodynamic status.