Ono Mamiko, Imamura Yamato, Irie Yusuke, Aritsune Manami, Nishioka Shinobu, Horikita Tetsuya
Laboratory of Large Animal Clinical Sciences, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880, Japan.
Laboratory of Theriogenology, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880, Japan.
J Vet Med Sci. 2020 May 15;82(5):559-565. doi: 10.1292/jvms.19-0495. Epub 2020 Mar 19.
This study investigated the use of transient elastography (TE) as a tool for the non-invasive evaluation of liver stiffness and controlled attenuation parameter (CAP) in cows. A total of 85 cows were used for this study. After the liver was located and subcutaneous tissue thickness was checked by means of ultrasonography, liver stiffness and CAP were measured using TE. At least 10 measurements were taken per individual cow. In addition, intraclass correlation coefficients were calculated for intra-rater and two-rater inter-rater reliability of liver stiffness and CAP measurement, and were evaluated. Of the 85 cows, 61 (71.8%) were measurable owing to their significantly less body weight and subcutaneous tissue thickness compared with those of unmeasurable cows. Liver stiffness showed no significant differences among sexes, ages, or breeds. CAP showed no significant differences among sexes and breeds. Intra- and inter-rater reliabilities for liver stiffness and CAP were almost perfect. Both liver stiffness and CAP could be quantitatively evaluated with good reproducibility in cows using TE, and CAP increased with the growth of the cows. However, evaluation was not possible in obese cows or cows with high values for subcutaneous tissue thickness or body weight.
本研究调查了瞬态弹性成像(TE)作为一种用于无创评估奶牛肝脏硬度和受控衰减参数(CAP)的工具的应用情况。本研究共使用了85头奶牛。通过超声检查确定肝脏位置并检查皮下组织厚度后,使用TE测量肝脏硬度和CAP。每头奶牛至少进行10次测量。此外,计算了肝脏硬度和CAP测量的评分者内和双评分者评分者间可靠性的组内相关系数,并进行了评估。在这85头奶牛中,61头(71.8%)由于与不可测量奶牛相比体重和皮下组织厚度显著较小而可测量。肝脏硬度在性别、年龄或品种之间没有显著差异。CAP在性别和品种之间没有显著差异。肝脏硬度和CAP的评分者内和评分者间可靠性几乎完美。使用TE可以在奶牛中对肝脏硬度和CAP进行定量评估,且具有良好的可重复性,并且CAP随着奶牛的生长而增加。然而,肥胖奶牛或皮下组织厚度或体重值较高的奶牛无法进行评估。