Liver Fat Score and CT Liver-to-Spleen Ratio as Predictors of Fatty Liver Disease by HIV Status

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madman

Super Moderator
Beyond Testosterone Book by Nelson Vergel
Abstract

Background and Aim: Non-alcoholic fatty liver disease (NAFLD) is common among HIV-infected (HIV+) adults. The Liver Fat Score (LFS) is a non-invasive, rapid, inexpensive diagnostic tool that uses routine clinical data and is validated against biopsy in HIV-uninfected (HIV-) persons. CT liver-to-spleen (L/S) attenuation ratio is another validated method to diagnose NAFLD. We compared NAFLD prevalence using the LFS versus L/S ratio among Multicenter AIDS Cohort Study participants to assess the LFS’s performance in HIV+vs. HIV-men.


Methods: In a cross-sectional analysis of men reporting<3 alcoholic drinks daily (308 HIV+, 218 HIV-), Spearman correlations determined relationships between LFS and L/S ratio by HIV serostatus. Multivariable regression determined factors associated with discordance in LFSand L/S ratio-defined NAFLD prevalence.


Results: NAFLD prevalence by LFS and L/S ratio were 28%/15% for HIV+men and 20%/19% for HIV-men, respectively. Correlations between LFS and L/S ratio were weaker among HIV+than HIV-men, but improved with increasing BMI and exclusion of HCV-infected men. LFS and L/S ratio discordance occurred more frequently and across BMI strata among HIV+men, but predominantly at BMI<30 kg/m2 among HIV-men. In multivariate analysis, only lower total testosterone levels were significantly associated with discordance.


Conclusion: NAFLD prevalence was similar by LFS and L/S ratio identification among HIV-men, but dissimilar and with frequent discordance between the two tests among HIV+men. As discordance may be multifactorial, biopsy data are needed to determine the best non-invasive diagnostic test for NAFLD in HIV+persons.








Conclusion

In conclusion, LFS and CT L/S ratio provided similar estimates of NAFLD prevalence among HIV-uninfected men, as would be expected given the previous validation of both techniques against biopsy-confirmed hepatic steatosis in the general population. However, NAFLD prevalence was much higher in HIV-infected men by LFS vs. L/S ratio, and we identified a high frequency of within-person discordance between LFS-and L/S ratio-defined NAFLD among HIV-infected men. Future studies that include liver biopsies are needed to determine the optimal tool for non-invasive NAFLD diagnosis in HIV-infected persons.
 

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