Abstract:
Objective This study aimed to investigate the correlation between controlled attenuation parameters (CAP) of the liver and serum 25-hydroxyvitamin D[25(OH)D] in patients with type 2 diabetes mellitus (T2DM). Methods A total of 160 patients with T2DM who were admitted to the First Affiliated Hospital of Bengbu Medical College from May 2019 to July 2020 were selected. On the basis of the CAP value, the patients were divided into the following groups: without NAFLD (43 patients), with mild NAFLD (35 patients), with moderate NAFLD (35 patients) and with severe NAFLD (47 patients). Vat, SAT, 25(OH)D and other biochemical indexes were measured, and differences in biochemical indexes amongst the groups were compared. Logistic regression analysis and Pearson or Spearman correlation analysis were performed, and ROC curve was used to analyse the optimal threshold of CAP for predicting vitamin D deficiency in patients with T2DM. Results 25(OH)D in the non-NAFLD group was significantly higher than that in the moderate and severe NAFLD groups, and 25(OH)D in the mild and moderate NAFLD groups was significantly higher than that in the severe NAFLD group (all P < 0.05). CAP was negatively correlated with 25(OH)D and HDL-C (r=-0.436, -0.193, all P < 0.05), whereas CAP was positively correlated with WHR, BMI, VAT, SAT, TC, TG, FINS, HOMA-IR, FFA, CRP, γ-GT and ALT (r= 0.276-0.447, all P < 0.05). 25(OH)D was negatively correlated with CAP, VAT, FBG, TC, TG, FFA, HOMA-IR, ALT, CRP and γ-GT (r=-0.436--0.156, all P < 0.05). Logistic regression analysis showed that FFA and 25(OH)D were the influencing factors for the development of NAFLD in T2DM. ROC curve showed that CAP265 dB/m as the diagnostic threshold had a sensitivity of 0.776 and a specificity of 0.637 for predicting vitamin D deficiency. Conclusion Liver fat content is negatively correlated with serum 25(OH)D in patients with T2DM, and 25(OH)D is a protective factor for NAFLD in T2DM.