AKURASI DERAJAT FIBROSIS HATI BERDASARKAN SIMPLER SCORE (S INDEX) TERHADAP FIBROSCAN PADA PASIEN PENYAKIT HATI B KRONIK

Background: A great interest has been dedicated to the development of noninvasive predictive models in recent years to substitute liver biopsy for fibrosis assessment and follow-up. Kun Zhou, et al proposed S index, a simpler model consisting of routine laboratory markers for predicting liver fibrosis in patients with chronic B liver disease in order to optimize their clinical management. Objective: To investigate the accuracy and predictive value of S index based on fibroscan for predicting liver fibrosis in patients with chronic B liver disease. Methods: Fifty two patients, confirmed chronic hepatitis B, underwent fibroscan in division of Gastroenterology and hepatology at Haji Adam Malik hospital, Medan. Serum obtained from those 52 patients since July 2011 until Jan 2012, analyzed for GGT, PLT, ALB activity, and the S index score was computed. Liver fibrosis pathology was staged according to a defined system on a scale of F0 to F4 in fibroscan. We used predictive values to assess the accuracy of S index scores. Results: S index was successfully identifying 100% significant fibrosis from 29 patients with sensitivity of 90.63% and specificity 100%, together, 71.2% of the total 52 patients could be identified correctly, only 5.7% were misidentified. S index in advanced fibrosis has 96,4% sensitivity, 100% specificity & PPV, 94,7% NPV. S index could also accurately predict the absence or presence of cirrhosis in 85% patients, with NPV of 95% and PPV of 85%, respectively. AUROC value for each significant, advanced fibrosis and cirrhosis was 0.953, 0.982, and 0.904, respectively. Conclusion: The S index, a simpler mathematical model consisting of routine laboratory markers predicts significant fibrosis, advanced fibrosis and cirrhosis in patients with chronic B liver disease with a high degree of accuracy, potentially decreasing the need for liver biopsy.