oa Cardiovascular Journal of Africa - Assessment of aortic valve regurgitation by measurement of the reverse flow in peripheral arteries
Aortic regurgitation (AR) increases the magnitude and duration of reverse flow in peripheral arteries. In this study a 9,5 MHz bidirectional Doppler ultrasound system was used to evaJuate the blood velocity waveform to determine whether a non-invasive assessment of AR couJd be made based on the relative reverse to forward components in the common carotid and femoral arteries. Blood velocity waveforms were recorded from the femoral artery in 6 control subjects and 19 patients with varying degrees of AR. The median ratio of the reverse to forward .~elocity in the control subjects was 0,22 (range 0,02 - O) and in the patients 0,47 (95 % confidence limits, 0,39 - 0,65). The difference was statistically significant (P <: 0,01, Mann Whitney U test). The simultaneous forward and reverse velocity comp6nents in the common carotid artery of 7 control subjects and 25 patients with AR was also measured, and the AR index calculated. The index was <: 1 in all control subjects (median 0,65, range 0,5 - 0,8) and> 1 in all patients (median 2,6, 95% confidence limits, 1,5 - 2,6). The difference is statistically significant (P <: 0,001). The results of tbis study suggest that the measurement of reverse blood velocity in peripberal arteries may provide a useful method of non-invasively assessing aortic valve disease.
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