phyrev ch.10 - Peripheral resistance volume of blood...

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Peripheral resistance – volume of blood inserted into one end is immediately expelled at the other end. - with high peripheral resistance – energy stored in the distended artery is unable to overcome the high resistance flow exists only in systole, silence in diastole, - triphasic or biphasic flow pattern results, ex Illiac, ECA - low peripheral resistance – energy overcome low resistance, flow is sustained throughout systole and diastole – ex ICA Pressure and velocities are inversely related Blood pressure from aorta to the peripheral arteries: - peak to peak pressure increases, peak systolic pressure increases, diastolic pressure decreases, peak to peak velocity decreases, max velocity decreases. Critical stenosis – decreases both pressure and flow. Non critical stenosis may no cause hemodynamic changes Arterial obstruction: - normal - rapid upstroke, sharp peak, prominent dicrotic notch - mildly abnormal – sharp peak, absent notch, bowed downslope - moderately abnormal – flattened peak, upslope = downslope, absent notch - severly abnormal – low amplitude, loss of pulsatility Resistance in a series: - obstructions in the same vessel , the resistance adds, they combine to form a
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phyrev ch.10 - Peripheral resistance volume of blood...

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