Key result
Doppler sample volume location skews calculated aortic valve area, with velocity profile tied to LVEF.
Why the study?
The impact of velocity distribution skewness in the left ventricular outflow tract on the accuracy of aortic valve area calculation in valvular aortic stenosis patients was unclear.
Does the location of pulsed Doppler sampling in the left ventricular outflow tract affect the calculation of aortic valve area in patients with aortic stenosis?
Cross-Sectional (n=40)
Does the location of pulsed Doppler sampling in the left ventricular outflow tract affect the calculation of aortic valve area in patients with aortic stenosis?
Effect estimate: r = 0.63
p-value: p=<0.001
In patients with aortic stenosis and preserved ejection fraction, the skewed velocity distribution in the LVOT means that the location of the pulsed Doppler sample volume significantly affects the accuracy of aortic valve area calculations.
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Pulsed Doppler sample volume location may bias aortic valve area calculations in aortic stenosis; hypothesis-generating and requires prospective validation before practice change.
Zhou et al. (1995) conducted a cross-sectional in valvular aortic stenosis (n=40). Pulsed Doppler sample volume location vs. Different sampling regions (anterior, middle, posterior) was evaluated on Correlation of time-velocity integral profile skewness with left ventricular ejection fraction in the long axis view (r = 0.63, p=<0.001). The location of the pulsed Doppler sample volume significantly affects calculated aortic valve area due to velocity distribution skewness, which correlates with ejection fraction (r=0.63, P<0.001).
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