丙氨酸转氨酶对FibroScan诊断慢性乙型肝炎肝纤维化分期的影响

Accuracy of FibroScan for the diagnosis of liver fibrosis influenced by serum alanine aminotransferase levels in patients with chronic hepatitis B

目的 探讨慢性乙型肝炎（CHB）患者中,不同水平的ALT对FibroScan诊断不同肝纤维化分期准确性的影响.方法 回顾性分析213例慢性乙型肝炎患者,根据血清ALT水平分为ALT＜1×正常值上限（ULN）、1×ULN≤ALT＜2×ULN和ALT≥2×ULN 3组,分析3组采用FibroScan诊断不同肝纤维化分期的ROC曲线下面积,判断其诊断准确性.根据不同资料采用t检验、x2检验、受试者工作曲线或其曲线下面积（AUROC）进行统计学分析.结果在213例CHB患者中,FibroScan值与不同肝纤维化分期在3组患者中均有明显的相关性（rs值分别为0.773、0.889和0.412,P值均＜0.05）.FibroScan诊断2级以上肝纤维化（F≥2,F0～1对比F2～4）和肝硬化（F=4,F0～3对比F4）的AUROC分别为0.916和0.971;其截断值分别为7.0kPa和13.0kPa;准确度分别为84.0%和93.4%.其诊断F≥2的AUROC和准确度均低于肝硬化.ALT＜1×ULN、1×ULN≤ALT＜2×ULN和ALT≥2×ULN 3组在诊断明显肝纤维化的AUROC分别为0.939、0.967和0.687,其敏感度分别为90.0%、89.7%和47.8%;准确度为90.5%、93.9%和68.4%.ALT≥2×ULN组的AUROC、敏感度和准确度明显低于另两组;而ALT＜2×ULN两组的AUROC和准确度相近.ALT＜1×ULN、1×ULN≤ALT＜2×ULN和ALT≥2×ULN 3组在诊断肝硬化的AUROC分别为0.970、0.985和0.952,其敏感度分别为93.8%、100%和100%;准确度分别为：88.9%、95.9%和92.1%.3组的AUROC、敏感度和准确度均较高,未随ALT升高而出现明显变化.结论 FibroScan是诊断2级以上肝纤维化,尤其是肝硬化可靠的检测方法; FibroScan诊断慢性乙型肝炎所致肝硬化的准确性可能受ALT升高的影响不明显;诊断2级以上肝纤维化的准确性对于ALT＜2×ULN的慢性乙型肝炎患者无明显影响,但是对ALT≥2×ULN的患者,其诊断的准确性降低.

Objective To analyze whether or not the accuracy of liver stiffness measurement （LSM）with transient elastography （FibroScan） for the diagnosis of liver fibrosis influenced by serum alanine aminotransferase （ALT） levels in patients with chronic hepatitis B. Methods 213 consecutive CHB patients who underwent liver biopsy and LSM were enrolled and divided into three groups by the criteria of ALT＜1×ULN, 1×ULN≤ALT＜2×ULN and ALT≥2×ULN. The areas under the receiver operating curve （AUC） were analyzed and the accuracy of FibroScan for the diagnosis of liver fibrosis were detected in the three groups. Results Significant correlation existed between the stages of liver fibrosis and LSM （rs=0.773,0.889 and 0.412, P＜0.05）. AUCs of LSM in all patients for significant fibrosis （F≥2, F0-1 vs F2-4）and cirrhosis （F=4, F0-3 vs F4） were 0.916 and 0.971 respectively.The accuracy of diagnosis for significant fibrosis and cirrhosis were 84.0% and 93.4% respectively.AUCs of LSM in ALT＜1×ULN,1×ULN≤ALT＜2×ULN and ALT≥2×ULN groups for significant fibrosis were 0.939, 0.967 and 0.687 respectively.The sensitivity of the three groups was 90.0%, 89.7% and 47.8% respectively. The accuracies of the three groups was 90.5%, 93.9% and 68.4% respectively. The AUC, sensitivity and accuracy of ALT≥2×ULN group for significant fibrosis were significantly lower than the other two groups. AUCs of LSM in three groups for cirrhosis were 0.970, 0.985 and 0.952 respectively. The sensitivities of the three groups were 93.8%,100% and 100% respectively. The accuracies of the three groups were 88.9%, 95.9% and 92.1% respectively.The AUCs, sensitivity and accuracy for cirrhosis of the three groups didn＇t change with elevated ALT. Conclusion Transient elastography （FibroScan） is a reasonable noninvasive tool to diagnose significant fibrosis,especially liver cirrhosis in CHB patients. The accuracy of FibroScan for diagnosis of liver cirrhosis may not be influenced by elevated ALT. While in ALT≥2 ×ULN group, the accuracy of FibroScan for diagnosis of significant fibrosis was significantly lower as compared to the ALT≤2×ULN groups.