Why the study?
What is the variability of hepatic vein Doppler waveforms in normal subjects?
What is the variability of hepatic vein Doppler waveforms in normal subjects?
Hepatic vein Doppler tracings can vary in normal subjects and be altered by respiratory maneuvers.
Hepatic vein Doppler variability in normals cautions against overinterpreting flattened tracings; leaves open standardization of respiratory effects.
A prospective study was undertaken to determine the variability of hepatic vein Doppler waveforms in normal subjects. Seventy-five patients without liver or heart disease underwent Doppler examination of the middle hepatic vein. Normal triphasic tracings were observed in 68 subjects, while flattened tracings were observed in seven subjects. In addition, in four of the seven subjects with flattened tracings, an increase in pulsatility was seen during prolonged inspiration. We conclude that there is variability of hepatic vein tracings in normal subjects and that respiratory maneuvers can alter these tracings.
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Shapiro et al. (1993) studied this question.
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