Why the study?
Does multigate ultrasonic Doppler measurement provide a better assessment of average cross-sectional blood flow velocity compared to single gate measurement in the ascending aorta of healthy adults?
Does multigate ultrasonic Doppler measurement provide a better assessment of average cross-sectional blood flow velocity compared to single gate measurement in the ascending aorta of healthy adults?
Multigate ultrasonic Doppler measurements are necessary to accurately determine average cross-sectional blood flow velocity in the ascending aorta, as single gate measurements are inadequate.
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Single-gate Doppler correlates less well with multigate aortic velocity averages; leaves open whether multigate methods merit clinical adoption.
The velocity pattern in the ascending aorta of 15 healthy adults was measured quasisimultaneously from the Doppler-shifts produced in 16 gates distributed equally within the cross-section along a narrow ultrasound beam which centrally traversed the vessel upstream of the brachiocephalic trunk. A comparison between the time integrals of the velocities in gates 9 (centre line), 4 and 13 (off centre) and the time integral of the weighted mean of the velocities of all gates correlated with r = 0.90, SEE = 1.05 (gate 9), r = 0.90, SEE 0.88 (gate 4) and r = 0.92, SEE 0.94 (gate 13). A better correlation (r = 0.96, SEE = 0.60) was found between the linear mean of all gates and the weighted mean. These results show that Doppler measurements in single small gates are not appropriate to determine the average cross-sectional blood flow velocity in healthy adults.
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Jenni et al. (1984) studied this question.
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