Lekeux P, Hajer R, Breukink H J
Can J Comp Med. 1984 Oct;48(4):420-1.
A procedure to standardize the position of an esophageal catheter (eso-cat) tip, used to measure intrathoracic pressure, was tested in ten healthy Dutch Friesians. The cattle were in normal condition with body weights (BW) between 52 and 670 kg and thoracic perimeters (TP) between 80 and 210 cm. The position of the neck and head was standardized. The eso-cat was introduced via the nose into the thoracic portion of the esophagus. The distance between the nares and the eso-cat tip (Lcat), which was positioned between the crossing point with the aorta and the caudal mediastinal lymph nodes, was measured for each animal. The regression equation, calculated between the Lcat and the BW and TP was, respectively: Lcat (cm) = 65 + 0.115 x BW (kg) (r2 = 0.99) and Lcat (cm) = 22 + 0.535 x TP (cm) (r2 = 0.97). The corresponding residual standard deviations were respectively 2.52 and 4.37 cm. The multiple and curvi-linear regression equation did not give a significantly better fit of the data.
一种用于测量胸内压的食管导管（eso-cat）尖端位置标准化程序，在10头健康的荷兰弗里斯兰牛身上进行了测试。这些牛处于正常状态，体重（BW）在52至670千克之间，胸围（TP）在80至210厘米之间。颈部和头部的位置已标准化。通过鼻腔将eso-cat插入食管的胸部部分。测量每头动物鼻孔与eso-cat尖端之间的距离（Lcat），该尖端位于与主动脉交叉点和后纵隔淋巴结之间。Lcat与BW和TP之间计算出的回归方程分别为：Lcat（厘米）= 65 + 0.115×BW（千克）（r2 = 0.99）和Lcat（厘米）= 22 + 0.535×TP（厘米）（r2 = 0.97）。相应的剩余标准差分别为2.52厘米和4.37厘米。多元和曲线回归方程对数据的拟合效果并未显著更好。
