超音波検査技術

ISSN: 1881-4506
一般社団法人日本超音波検査学会
〒162-0801 東京都新宿区山吹町358-5
Japanese Journal of Medical Ultrasound Technology 41(5): 475-484 (2016)
doi:10.11272/jss.41.475

原著Original Article

Virtual Touch Quantificationによる肝硬度測定の有用性—B型慢性肝炎を対象に—Usefulness of the Shear-wave Velocity by Virtual Touch Quantification in Chronic Hepatitis B

1藤田保健衛生大学医療科学部臨床検査学科Faculty of Medical Technology, School of Health Sciences, Fujita Health University

2藤田保健衛生大学病院臨床検査部Department of Clinical Laboratory, Fujita Health University Hospital

3藤田保健衛生大学医学部肝胆膵内科Department of Liver, Biliary Tract and Pancreas Diseases, 
School of Medicine, Fujita Health University

受付日:2016年2月5日Received: February 5, 2016
受理日:2016年6月12日Accepted: June 12, 2016
発行日:2016年10月1日Published: October 1, 2016
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はじめに:B型慢性肝炎の病態把握には線維化の程度を的確に診断することが重要である.B型慢性肝炎患者におけるVirtual Touch Quantification(VTQ)による肝硬度の有用性を検討した.

対象:2009年~2015年までに肝硬度測定を行ったB型肝炎患者339例(男性188例,病理組織診断:46例)を対象とした.

方法:肝硬度の測定は,右肋間走査にて計10回行い中央値(Vs; m/s)を用いて検討を行った.

結果:Vs値と各線維化マーカーを比較するとAPRI, ヒアルロン酸,PT, FIB-4, 血小板との間に有意な相関(ρ=0.578, 0.497, -0.486, 0.438, -0.336)を認めた(p<0.0001).各線維化stage別のVs値はF0–1 (n=10): 1.19 (1.00–1.59),F2 (n=18): 1.29 (1.20–1.59),F3 (n=11): 1.54 (1.39–2.24),F4 (n=7): 2.31 (1.94–2.69)であり,F4はF0–1, F2に比べ有意に高値を示した(p=0.0155, 0.0027).また各stageのカットオフ値はF2以上:1.16,F3以上:1.36,F4: 1.82であった.

考察:VTQによるVs値測定は,各種線維化マーカーおよび肝線維化stageと良好な相関関係があり,さらに肝線維化stageと最もよく相関しており,肝線維化評価に有用と思われた.

Background: Usefulness of shear-wave velocity (Vs) by virtual touch quantification (VTQ) in patients with hepatitis B was studied.

Subject: Vs was measured in 339 patients with hepatitis B (male: 188, histopathological diagnosis: 46).

Methods: Vs measured ten times in a right hepatic lobe and a median (Vs, m/s) was adopted.

Results: Vs value was significantly correlated with APRI, hyaluronic acid, prothrombin time, FIB-4, and platelet count (ρ=0.578, 0.497, -0.486, 0.438, -0.336; p<0.0001). Vs value was 1.19 (1.00–1.59) m/s in 10 patients with fibrosis stage of F0–1, 1.29 (1.20–1.59) m/s in 18 patients with F2, 1.54 (1.39–2.24) m/s in 11 patients with F3 and 2.31 (1.94–2.69) m/s in 7 patients with F4. Vs value significantly differed between F0–1 and F4 (p=0.0155), and between F2 and F4 (p=0.0027). The optimal cut-off values of Vs value were 1.16 m/s for F > or = 2, 1.36 m/s for F > or = 3 and 1.82 m/s for F4.

Discussion: Vs value was significantly correlated with fibrosis markers and fibrosis stage in chronic hepatitis B. In conclusion, Vs value was valuable for a diagnosis of fibrosis in chronic hepatitis B.

Key words: Virtual Touch Quantification; shear-wave velocity; liver stiffness; liver fibrosis; HBV

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