MORPHOMETRIC ASSESSMENT OF CANINE HEART WITHOUT MACROSCOPICALLY VISIBLE CHANGES CAUSED BY CARDIAC DISEASE

Abstract The purpose of this study was to collect data on the cardiac morphometry of thirty adult male and female dogs without macroscopic changes indicative of heart disease, regardless of animal's body weight and score. The dogs were weighed, grouped according to their body weight, and necropsied for a macroscopic evaluation of their cardiac measurements. The data obtained were included in a database. The following cardiac measures were evaluated: vertical and horizontal axes, weight, volume, thickness of the right and left atria and ventricles, and horizontal and vertical axes of the atrial and ventricular chambers. The heart weight was found to represent 0.6 to 1.1% of the animal's body weight. No differences were found in cardiac size and weight as a function of sex. The ratio between the vertical and horizontal cardiac axes was 1.11. The left ventricle was found to be 1.6 to threefold thicker than the right ventricle. The results were considered standard for dogs and can be used for macroscopic evaluations of cardiac hypertrophy or dilation.摘要：本研究旨在收集30只成年雌雄犬的心脏形态测量学数据，所有受试犬均无提示心脏疾病的肉眼可见病变，且不受其体重与体况评分的限制。研究人员对所有受试犬进行称重，按体重分组，并通过尸检开展心脏测量指标的肉眼评估，所获数据均录入数据库。本次评估的心脏测量指标包括：心脏垂直轴与水平轴、心脏重量、容积、左右心房及心室的厚度，以及心房与心室腔的垂直轴和水平轴。研究发现，心脏重量占受试犬体重的0.6%至1.1%；未发现心脏大小与重量存在性别相关差异；心脏垂直轴与水平轴的比值为1.11；左心室厚度为右心室的1.6至3倍。本研究结果被认定为犬类心脏形态的参考标准，可用于心脏肥大或扩张的肉眼评估。