Journal of Ultrasound in Medicine, Vol 9, Issue 8 449-453, Copyright © 1990 by American Institute of Ultrasound in Medicine
Doppler blood velocity waveforms and the relation to peripheral resistance in the brachial artery
J. Legarth and C. Nolsoe
Department of Obstetrics and Gynaecology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
The relationship between peripheral resistance and the Doppler blood
velocity indices--pulsatility index (PI), A/B ratio, resistance index (RI),
and the minimum velocity (Vmin)--was evaluated in the brachial arteries of
five young women. All the indices showed a very good correlation with
resistance (r greater than 94%); the regression line for both PI and A/B
were linear, whereas the relationships between resistance and RI, and
resistance and Vmin, were best described by a logarithmic and by power
function, respectively. Although the women were carefully selected to be as
alike as possible, there were significant differences in the individual
slopes of the regression lines.
