Circulation, Vol 52, 874-879, Copyright © 1975 by American Heart Association
DR Boughner
Using a 2.2 MHZ directional Doppler ultrasound unit, the instantaneous peak
aortic velocity pattern was recorded transcutaneously in 15 normal persons
and 15 patients with aortic insufficiency. The transducer was positioned in
the suprasternal notch and aimed posteriorly to cross the descending aortic
arch at an angle approximately parallel to blood flow. The
electrocardiogram, phonocardiogram, and carotid pulse tracings were
recorded simultaneously. In patients with aortic insufficiency there was
significant diastolic flow that was not present in normal persons. The
planimetered area under the systolic and diastolic velocity tracings
represents the distance forward and backward that the stroke volume moves.
The ratio was used to approximate the percent regurgitation, which ranged
from 9% to 68%. From left ventricular angiograms in the patients with
aortic regurgitation single plane ventricular volume measurements were used
to calculate ventricular output and when compared with the Fick cardiac
output gave an estimate of true percent regurgitation. A strong correlation
was obtained with the Doppler estimate (r=0.91), confirming that this
simple ultrasound technique can accurately assess the degree of aortic
insufficiency.
ARTICLES
Assessment of aortic insufficiency by transcutaneous Doppler ultrasound
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