Hansson Kerstin, Häggström Jens, Kvart Clarence, Lord Peter
Department of Clinical Radiology, Swedish University of Agricultural Sciences, Box 7029, SE-750 07 Uppsala, Sweden.
Vet Radiol Ultrasound. 2002 Nov-Dec;43(6):568-75. doi: 10.1111/j.1740-8261.2002.tb01051.x.
Two-dimensional (2-D) echocardiographic measurement of the left atrium (LA) has the potential to be more accurate than the standard M-mode method, because the LA body can be measured. We evaluated a 2-D method for measuring LA and aorta (AO) in a right parasternal short-axis view and compared it to the M-mode method. An index for LA size (LA/AO) was calculated in 166 cavalier King Charles spaniels, 56 normal and 110 dogs with mitral regurgitation (MR) of varying degrees secondary to chronic valvular disease. In normal dogs, the AO-2-D and LA/AO-2-D did not correlate to body weight (BW) or BW2; whereas, all M-mode values and the LA-2-D were significantly (p < .05) related to both BW parameters. In normal dogs, there was no difference between M-mode and 2-D indices. For all dogs (normal and dogs with MR) there was an 11% bias between the M-mode and 2-D index with the LA/AO-2-D being higher than the LA/AO-M. The association between the mean and the difference of the indices demonstrated a quadratic relationship. Dogs with a mean LA/AO of 2.0-2.5 showed the largest difference between the two indices. Small values for the 2-D coefficients of variation for respiration and stage of diastole were found; 3.4 and 3.1%, respectively. The 2-D index is more sensitive to LA enlargement than the M-mode index.
二维（2-D）超声心动图测量左心房（LA）有可能比标准M型方法更准确，因为可以测量左心房体部。我们评估了一种在右胸骨旁短轴视图中测量LA和主动脉（AO）的二维方法，并将其与M型方法进行比较。在166只骑士查理王小猎犬中计算LA大小指数（LA/AO），其中56只为正常犬，110只为继发于慢性瓣膜病的不同程度二尖瓣反流（MR）犬。在正常犬中，AO-2-D和LA/AO-2-D与体重（BW）或BW²均无相关性；而所有M型测量值和LA-2-D与这两个体重参数均显著相关（p <.05）。在正常犬中，M型和二维测量指数之间没有差异。对于所有犬（正常犬和患有MR的犬），M型和二维指数之间存在11%的偏差，LA/AO-2-D高于LA/AO-M。指数均值与差值之间的关联呈二次关系。平均LA/AO为2.0 - 2.5的犬在两种指数之间显示出最大差异。发现呼吸和舒张期阶段的二维变异系数值较小，分别为3.4%和3.1%。二维指数比M型指数对LA增大更敏感。
