Mengyi Li1, Di Cao2, Yang Liu1, Lan Jin1, Na Zeng3, Lixue Wang1, Kaixin Zhao1, Han Lv2, Meng Zhang1, Peng Zhang1, Zhenghan Yang4, Zhongtao Zhang5. 1. Department of General Surgery, Beijing Friendship Hospital, Capital Medical University & National Clinical Research Center for Digestive Diseases, No.95 Yong-an Road, Xi-Cheng District, Beijing, 100050, China. 2. Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No.95 Yong-an Road, Xi-Cheng District, Beijing, 100050, China. 3. National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, No.95 Yong-an Road, Xi-Cheng District, Beijing, 100050, China. 4. Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No.95 Yong-an Road, Xi-Cheng District, Beijing, 100050, China. zhenghanyang@263.net. 5. Department of General Surgery, Beijing Friendship Hospital, Capital Medical University & National Clinical Research Center for Digestive Diseases, No.95 Yong-an Road, Xi-Cheng District, Beijing, 100050, China. zhangzht@ccmu.edu.cn.
Abstract
BACKGROUND: Obesity is a worldwide epidemic leading to non-alcoholic fatty liver disease. Alterations in the liver fat fraction (LFF) assessed by MRI following bariatric surgery is a promising feature; however, few studies have been fully elucidated. PURPOSE: To determine the alterations in the LFF features following surgery using MRI, to determine the correlation with the clinical non-alcoholic steatohepatitis score (C-NASH score), and to identify the predictive factors for postoperative score changes. METHODS: Patients (n = 69) underwent MRI to measure the LFF at baseline and 3 months postoperatively. Paired sample t tests were applied to investigate the alterations in the major parameters. Univariate analyses were performed to evaluate the factors predicting C-NASH score changes after surgery. RESULTS: Compared with the baseline levels, the LFF significantly decreased 3 months postoperatively (P < 0.001). Significant positive correlations were detected between the C-NASH score and LFF levels (P < 0.001). Among the ROC curves for C-NASH score change, the AUC for the ROC curve of LFF was 0.812 (95% CI 0.707, 0.916) and the cut-off value was 6.16%. Weight at baseline was a significant predictive factor for postoperative changes when the C-NASH score was ≥ 3 (P < 0.001). The AUC for the ROC curve of weight was 0.897 (95% CI 0.782, 1.000) and 117 kg was the cut-off value. CONCLUSIONS: LFF decreased following bariatric surgery, which predicted C-NASH score changes after surgery. For patients with a higher risk of NASH (score ≥ 3) at baseline and lower preoperative body weight, we noted significantly greater effects of surgery on score change value.
BACKGROUND: Obesity is a worldwide epidemic leading to non-alcoholic fatty liver disease. Alterations in the liver fat fraction (LFF) assessed by MRI following bariatric surgery is a promising feature; however, few studies have been fully elucidated. PURPOSE: To determine the alterations in the LFF features following surgery using MRI, to determine the correlation with the clinical non-alcoholic steatohepatitis score (C-NASH score), and to identify the predictive factors for postoperative score changes. METHODS:Patients (n = 69) underwent MRI to measure the LFF at baseline and 3 months postoperatively. Paired sample t tests were applied to investigate the alterations in the major parameters. Univariate analyses were performed to evaluate the factors predicting C-NASH score changes after surgery. RESULTS: Compared with the baseline levels, the LFF significantly decreased 3 months postoperatively (P < 0.001). Significant positive correlations were detected between the C-NASH score and LFF levels (P < 0.001). Among the ROC curves for C-NASH score change, the AUC for the ROC curve of LFF was 0.812 (95% CI 0.707, 0.916) and the cut-off value was 6.16%. Weight at baseline was a significant predictive factor for postoperative changes when the C-NASH score was ≥ 3 (P < 0.001). The AUC for the ROC curve of weight was 0.897 (95% CI 0.782, 1.000) and 117 kg was the cut-off value. CONCLUSIONS: LFF decreased following bariatric surgery, which predicted C-NASH score changes after surgery. For patients with a higher risk of NASH (score ≥ 3) at baseline and lower preoperative body weight, we noted significantly greater effects of surgery on score change value.
Authors: B Dustin Pooler; Curtis N Wiens; Alan McMillan; Nathan S Artz; Alexandra Schlein; Yesenia Covarrubias; Jonathan Hooker; Jeffrey B Schwimmer; Luke M Funk; Guilherme M Campos; Jacob A Greenberg; Garth Jacobsen; Santiago Horgan; Tanya Wolfson; Anthony C Gamst; Claude B Sirlin; Scott B Reeder Journal: Radiology Date: 2018-12-18 Impact factor: 11.105
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