Increased liver stiffness by transient elastography and acoustic radiation force impulse imaging in patients with extrahepatic cholestasis.

BACKGROUND: Transient elastography and acoustic radiation force impulse (ARFI) imaging are noninvasive tools for liver stiffness measurement (LSM), which may be influenced by cholestasis. AIM: The aim of the study was to evaluate the performance of transient elastography and ARFI in extrahepatic cholestasis and correlate changes in LSM with biochemical activity. MATERIALS AND METHODS: A total of 38 patients with extrahepatic cholestasis prospectively underwent transient elastography and ARFI. Changes in LSM by transient elastography/ARFI were evaluated after 1 week of ERCP and correlated with biochemical parameters. The optimal ARFI cutoffs according to stages of clinical interest were analyzed. RESULTS: Biliary obstruction was calcular in 21 (55.3%) and noncalcular in 17 (44.7%) (benign n = 15, malignant n = 2). After 1 week, adequate biliary drainage reduced total bilirubin from 7.7 to 2.2 mg/dL (P < 0.001) which significantly correlated with reduction of LSM by transient elastography from 12.38 ± 6.68 kPa to 8.08 ± 3.21 kPa (P < 0.001), and by ARFI from 1.73 ± 0.51 m/s to 1.56 ± 0.70 m/s (P = 0.014). The LSM percentage change showed a decrease (nonsignificant, P = 0.843) by 25.83% using transient elastography and a significant decrease (P < 0.001) by 18.42% using ARFI in the improved patients. At initial visit, transient elastography positively correlated with ARFI, bilirubin and platelets, also, transient elastography had a positive correlation with ARFI, bilirubin, alkaline phosphatase (ALP), γ-glutamyl transpeptidase (GGT) in follow-up visit. LSM by ARFI (visit 1) negatively correlated with ALT, while in (visit 2), ARFI positively correlated with bilirubin, ALP, GGT and negatively correlated with albumin. CONCLUSION: The increased LSM in patients with extrahepatic cholestasis is reduced after adequate biliary drainage, implying that increased values are not solely due to liver fibrosis, but due to biliary congestion leading temporarily to increased elasticity.

Liver fibrosis: consensus recommendations of the Asian Pacific Association for the Study of the Liver (APASL).

Liver fibrosis is a common pathway leading to cirrhosis, which is the final result of injury to the liver. Accurate assessment of the degree of fibrosis is important clinically, especially when treatments aimed at reversing fibrosis are being evolved. Liver biopsy has been considered to be the "gold standard" to assess fibrosis. However, liver biopsy being invasive and, in many instances, not favored by patients or physicians, alternative approaches to assess liver fibrosis have assumed great importance. Moreover, therapies aimed at reversing the liver fibrosis have also been tried lately with variable results. Till now, there has been no consensus on various clinical, pathological, and radiological aspects of liver fibrosis. The Asian Pacific Association for the Study of the Liver set up a working party on liver fibrosis in 2007, with a mandate to develop consensus guidelines on various aspects of liver fibrosis relevant to disease patterns and clinical practice in the Asia-Pacific region. The process for the development of these consensus guidelines involved the following: review of all available published literature by a core group of experts; proposal of consensus statements by the experts; discussion of the contentious issues; and unanimous approval of the consensus statements after discussion. The Oxford System of evidence-based approach was adopted for developing the consensus statements using the level of evidence from 1 (highest) to 5 (lowest) and grade of recommendation from A (strongest) to D (weakest). The consensus statements are presented in this review.