Department of Veterinary Medical Sciences, Alma Mater Studiorum - University of Bologna, via Tolara di Sopra 50, 40064, Ozzano dell'Emilia, Italy.
Freelance Veterinary Cardiologist, Bologna, Italy.
J Vet Cardiol. 2022 Aug;42:52-64. doi: 10.1016/j.jvc.2022.06.003. Epub 2022 Jun 14.
INTRODUCTION/OBJECTIVE: The T wave is a poorly characterized electrocardiographic variable in small animals. Therefore, this study aimed to describe T wave features in a large population of healthy dogs.
ANIMALS, MATERIALS, AND METHODS: Medical records were reviewed to identify healthy dogs ≥one-year-olds that underwent an electrocardiogram. T wave qualitative (morphology, polarity, and concordance between R and T waves) and quantitative (duration, amplitude, mean electrical axis, ratio between T and R waves amplitudes, interval from the peak to the end of the T wave, and ratio between the duration of the latter interval and that of the QT) variables were evaluated. Continuous and categorical variables were compared between dogs of distinct sex, body weight (BW), age and somatotype using the Mann-Whitney U test and χ test, respectively. Spearman's correlation coefficients between quantitative variables and age and BW were calculated. Reference intervals of quantitative variables were determined in the overall population.
One hundred and twenty-nine dogs were enrolled. Concerning morphology, the asymmetrical (slow/fast) pattern occurred more frequently than the symmetrical and biphasic ones. Concerning polarity, positive T waves occurred more frequently than negative and neutral ones. T and R waves were predominantly concordant. No meaningful differences were found when comparing qualitative and quantitative variables between dogs of distinct sex, BW, age and somatotype. No significant correlations were found between quantitative variables and age and BW. Reference intervals of quantitative variables are provided.
Canine T wave features were addressed and statistically reliable reference intervals made available for clinical use.
简介/目的：在小动物中，T 波是一个特征描述较差的心电图变量。因此，本研究旨在描述大量健康犬的 T 波特征。
动物、材料和方法：回顾了医疗记录，以确定≥一岁且接受心电图检查的健康犬。评估 T 波的定性（形态、极性和 R 波与 T 波之间的一致性）和定量（持续时间、幅度、平均电轴、T 波与 R 波幅度之比、从波峰到 T 波终点的间隔以及后一间隔的持续时间与 QT 之间的比率）变量。使用曼-惠特尼 U 检验和 χ 检验分别比较不同性别、体重（BW）、年龄和体型犬之间的连续和分类变量。计算定量变量与年龄和 BW 之间的 Spearman 相关系数。在总体人群中确定定量变量的参考区间。
共纳入 129 只犬。就形态而言，不对称（慢/快）模式比对称和双相模式更为常见。就极性而言，正向 T 波比负向和中性 T 波更为常见。T 波和 R 波主要是一致的。不同性别、BW、年龄和体型犬之间的定性和定量变量比较无明显差异。定量变量与年龄和 BW 之间无显著相关性。提供了定量变量的参考区间。
描述了犬的 T 波特征，并为临床应用提供了具有统计学意义的可靠参考区间。
