Doppler ultrasound

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Resistive Index
Normal Doppler


Nonresistive Vessels - high diastolic component for organs that need constant perfusion, internal carotid, hepatic and renal arteries.


Resistive Vessels - litttle to reversed flow in diastole for organs that do not need constant perfusion, external carotid, iliac and brachial arteries.


Resistive Index - compares peak systole to minimum diastole (see diagram).



Transplant Liver


Hepatic artery stenosis - parvus trades waveform or velocity > 200 cm/s


Portal vein stenosis - narrowing < 2.5 cm or velocity > 150 cm/s at anastomoses


Hepatic vein stenosis - flattening of the normal triphasic waveform