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Optimal threshold of controlled attenuation parameter with MRI‐PDFF as the gold standard for the detection of hepatic steatosis
Author(s) -
Caussy Cyrielle,
Alquiraish Mosab H.,
Nguyen Phirum,
Hernandez Carolyn,
Cepin Sandra,
Fortney Lynda E.,
Ajmera Veeral,
Bettencourt Ricki,
Collier Summer,
Hooker Jonathan,
Sy Ethan,
Rizo Emily,
Richards Lisa,
Sirlin Claude B.,
Loomba Rohit
Publication year - 2018
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.29639
Subject(s) - interquartile range , nonalcoholic fatty liver disease , steatosis , medicine , magnetic resonance imaging , receiver operating characteristic , confidence interval , gold standard (test) , nuclear medicine , body mass index , prospective cohort study , fatty liver , radiology , disease
The optimal threshold of controlled attenuation parameter (CAP) for the detection of hepatic steatosis using both M and XL probe is unknown in nonalcoholic fatty liver disease (NAFLD). Magnetic resonance imaging proton density fat fraction (MRI‐PDFF) is an accurate and precise method of detecting the presence of hepatic steatosis that is superior to CAP. Thus, the aim of this study was to evaluate the diagnostic accuracy and optimal threshold of CAP for the detection of hepatic steatosis as defined by MRI‐PDFF ≥ 5%. This prospective cross‐sectional study included 119 adults (59% women) with and without NAFLD who underwent MRI‐PDFF and CAP using either M or XL probe when indicated within a 6‐month period at the NAFLD Research Center, University of California, San Diego. The mean ( ± standard deviation) age and body mass index were 52.4 (±15.2) years and 29.9 (±5.5) kg/m 2 , respectively. The prevalence of NAFLD (MRI‐PDFF ≥ 5%) and MRI‐PDFF ≥ 10% was 70.6% and 47.1%, respectively. The area under the receiver operating characteristic (AUROC) of CAP for the detection of MRI‐PDFF ≥ 5% was 0.80 (95% confidence interval [CI], 0.70‐0.90) at the cut‐point of 288 dB/m and of MRI‐PDFF ≥ 10% was 0.87 (95% CI, 0.80‐0.94) at the cut‐point of 306 dB/m. When stratified by the interquartile range (IQR) of CAP, we observed that an IQR below the median (30 dB/m) had a robust AUROC compared with an IQR above the median (0.92 [95% CI, 0.85‐1.00] versus 0.70 [95% CI, 0.56‐0.85]; P = 0.0117), and these differences were statistically and clinically significant. Conclusion : The cut‐point of CAP for presence of hepatic steatosis (MRI‐PDFF ≥ 5%) was 288 dB/m. The diagnostic accuracy of CAP for the detection of hepatic steatosis is more reliable when the IQR of CAP is <30 dB/m. These data have implications for the clinical use of CAP in the assessment of NAFLD. (H epatology 2018;67:1348‐1359)