Sunday, February 18, 2007

Blood flow patterns

Peripheral muscular arteries always show a triphasic pattern (forward-reverse-forward flow):
  • forward - steep rise during ventricular systole
  • reverse - brusque return to baseline with a small negative wave in early diastole caused by the high resistance of small peripheral arteries and capillaries
  • forward - slow late diastolic rise due to the compliance of the peripheral arterial walls.
A monophasic waveform without the reverse component occurs when the volume in the artery is insufficient and extra flow is required during diastole. This is usually because stenosis or occlusion reduces the blood available to fill the reservoir during systole, but may also occur when there is a large flow to the limb caused by exercise or gross infection.

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