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Doppler measurements: a surrogate marker of liver fibrosis?
Thomas Bernatik1, Deike Strobel, Eckhart Georg Hahn
1Department of Internal Medicine I, Friedrich-Alexander-University Erlangen-Nuremberg, Krenkenhausstrasse 12, D-91054 Erlangen, Germany. thomas.bernatik@med1.imed.uni-erlangen.de
Insights
Doppler measurements of liver vasculature do not accurately assess liver fibrosis. This study found no significant correlation between Doppler parameters and the degree of liver fibrosis, indicating it
Area of Science:
- Hepatology
- Diagnostic Imaging
- Vascular Ultrasound
Background:
- Liver fibrosis assessment is crucial for managing chronic liver diseases.
- Non-invasive methods for staging liver fibrosis are highly sought after.
- Doppler ultrasound is a non-invasive technique that measures blood flow characteristics.
Purpose of the Study:
- To evaluate the diagnostic value of Doppler measurements of liver vasculature.
- To determine the correlation between Doppler parameters and histological liver fibrosis.
- To assess if Doppler measurements can reliably stage liver fibrosis.
Main Methods:
- Forty-three patients with chronic viral hepatitis underwent liver biopsy.
- Doppler measurements of portal vein, hepatic artery, and hepatic veins were performed.
- Measurements included blood flow velocity, resistance indices, vessel diameter, and volume.
Main Results:
- A significant overlap in Doppler measurements was observed across all fibrosis stages.
- No significant changes in Doppler parameters were detected between mild and severe fibrosis.
- Doppler measurements did not differentiate between various stages of liver fibrosis.
Conclusions:
- Doppler measurements of the portal vein, hepatic artery, and hepatic veins are not valid surrogate markers for liver fibrosis.
- Doppler ultrasound is not a useful method for estimating the degree of liver fibrosis.
- Histological assessment remains the gold standard for staging liver fibrosis.
Objective:
The potential diagnostic value of performing Doppler measurements of liver vasculature to assess early stages of liver fibrosis has not been established. Due to the potential clinical impact, this study focused on the correlation between Doppler measurements and histologically proven liver fibrosis.
Methods:
Forty-three consecutive patients with chronic viral hepatitis (79% hepatitis C) were enrolled. At the time of liver biopsy, two independent investigators measured maximum and mean blood flow velocity, resistance indices, vessel diameter and blood flow volume in the portal vein, hepatic artery and hepatic veins. All measurements were taken in triplicate. The mean values were correlated to the degree of liver fibrosis using the Ludwig score.
Results:
Sixty-seven per cent of the patients in our study group had no or only mild fibrosis (Ludwig score stage I or II). Thirty-three per cent showed progressive fibrosis or cirrhosis (Ludwig score stage III or IV). There was a large overlap in the Doppler measurements and findings between the various disease stages. No significant changes of Doppler parameters were detected, even between patients with no or mild fibrosis and patients with severe fibrosis (Ludwig score stage III or IV).
Conclusions:
Doppler measurements of the portal vein, hepatic artery and hepatic vein(s) are not a valid surrogate marker of liver fibrosis. Nor are Doppler measurements a useful method to estimate the degree of liver fibrosis.