Shear Wave Dispersion and Assessment of Liver Inflammation: Limitations Beyond Fibrosis
In the provided source fragments, specific numerical thresholds for shear wave dispersion for quantitative assessment of liver inflammation are absent. The available data concern primarily the velocity and stiffness of shear wave (SWS/SWE) for fibrosis staging. Therefore, dispersion thresholds for inflammation — [to be clarified].
Influence of Inflammation on Stiffness Measurements
According to ACR/SRU Practice Parameter (2024), liver stiffness measured by elastography may be overestimated in the following conditions at the time of examination:
- transaminitis;
- biliary obstruction;
- acute hepatitis;
- infiltrative liver diseases;
- congestive hepatopathy.
This emphasizes the clinical significance of differentiating the contribution of inflammatory activity from true fibrosis; however, quantitative thresholds for such differentiation are not provided in the fragments.
Measurement Quality Criteria
According to ACR/SRU (2024), accurate data acquisition is characterized by IQR/M ≤30% for kPa and ≤15% for m/s. Adherence to these quality criteria is important for any interpretation of elastographic parameters.
Thresholds for Fibrosis (Reference for Context)
For contextual differentiation, SWE thresholds available in the fragments are provided. Dispersion thresholds for inflammation are not described therein.
| Parameter | Value | Interpretation (Source) |
|---|---|---|
| SWE, MASLD | < 8 kPa | Exclusion of advanced fibrosis (WFUMB, 2024, Recommendation 1, LoE 1a, GoR A) |
| SWE, MASLD | > 12–15 kPa | Confirmation of advanced fibrosis (WFUMB, 2024) |
| VCTE | 12 kPa | Optimal threshold for rule-in of advanced fibrosis (WFUMB, 2024) |
| SWE | < 5 kPa (1.3 m/s) | High probability of normal (SRU consensus) |
| SWE | 5–9 kPa (1.3–1.7 m/s) | In the absence of clinical signs — exclusion of cACLD (SRU consensus) |
| SWE | 9–13 kPa (1.7–2.1 m/s) | Suspicion of cACLD, confirmation needed (SRU consensus) |
| SWE | 13–17 kPa (2.1–2.4 m/s) | High probability of cACLD (SRU consensus) |
Significant fibrosis is considered F2 and above, advanced fibrosis — F3 and above on the Metavir scale (Diagnostic Ultrasound: Abdomen & Pelvis, 2022).
Practical Conclusion
In the presence of active inflammatory activity, interpretation of absolute stiffness values requires caution due to the risk of fibrosis overestimation (ACR/SRU, 2024). Specific thresholds for shear wave dispersion for assessment of liver inflammation are not determined in the provided sources — [to be clarified].
Frequently asked questions
Are there validated thresholds of shear wave dispersion for liver inflammation?
In the provided fragments, such thresholds are absent — [to be clarified].
Why does inflammation affect elastography results?
According to ACR/SRU (2024), liver stiffness may be overestimated in transaminitis, acute hepatitis, biliary obstruction, infiltrative diseases, and congestive hepatopathy.
What measurement quality criteria should be applied?
IQR/M ≤30% for kPa and ≤15% for m/s is considered a sign of accurate data acquisition (ACR/SRU, 2024).
What SWE thresholds should be used for advanced fibrosis in MASLD?
Less than 8 kPa — exclusion; greater than 12–15 kPa — confirmation of advanced fibrosis (WFUMB, 2024, LoE 1a, GoR A).
What is classified as advanced fibrosis on the Metavir scale?
F3 and above (septal/bridging fibrosis and cirrhosis); significant fibrosis — F2 and above (Diagnostic Ultrasound, 2022).