Lerdweeraphon Wichaporn, Thanwongsa Surangkhana, Youyod Suriya, Imsopa Sermsawat, Kenchaiwong Wootichai
Applied Animal Physiology Research Unit, Faculty of Veterinary Sciences, Mahasarakham University, Thailand.
Faculty of Veterinary Sciences, Mahasarakham University, Thailand.
Vet World. 2020 May;13(5):1001-1004. doi: 10.14202/vetworld.2020.1001-1004. Epub 2020 May 30.
This study aimed to investigate the effects of breed, sex, age, and body weight on different electrocardiographic parameters in military working dogs (Labrador Retriever and German Shepherd).
Electrocardiographic recordings (paper speed = 25 mm/s and calibration = 10 mm/mV) were performed to obtain all the standard bipolar limb leads (leads I, II, and III) and unipolar augmented limb leads (leads aVR, aVL, and aVF). A total of 16 Labrador Retrievers and 14 German Shepherds were restrained manually in the right lateral recumbency without any tranquilizer or anesthetic drug. Amplitude and duration of P, QRS, and T wave, PR and QT interval, mean electrical axis, and heart rate were measured in each recording.
There was no significant difference in electrocardiographic parameters across breed and sex. However, QRS duration tended to alter by breed (p<0.1) in Labrador Retrievers (0.04±0.005 s), which is lower than German Shepherds (0.05±0.005 s). PR interval was influenced by sex (p<0.1). PR interval was higher in females (0.13±0.005 s) than males (0.11±0.008 s). In addition, electrocardiographic values were not significantly affected by age and body weight, except that the amplitude of R wave was statistically affected by age (p<0.05). A correlation was found between the decrease in R wave amplitude and increase in age of dogs.
Different electrocardiographic parameters were within the normal range. A significant effect of age was seen on amplitude of R wave. However, the effect of breed, sex, and body weight was not significant on different electrocardiographic parameters in Labrador Retriever and German Shepherd dogs.
本研究旨在调查品种、性别、年龄和体重对军犬（拉布拉多寻回犬和德国牧羊犬）不同心电图参数的影响。
进行心电图记录（纸速 = 25 mm/s 且校准 = 10 mm/mV）以获取所有标准双极肢体导联（I、II 和 III 导联）和单极加压肢体导联（aVR、aVL 和 aVF 导联）。总共 16 只拉布拉多寻回犬和 14 只德国牧羊犬被手动限制在右侧卧位，未使用任何镇静剂或麻醉药物。在每次记录中测量 P、QRS 和 T 波的振幅和持续时间、PR 和 QT 间期、平均电轴以及心率。
不同品种和性别的心电图参数无显著差异。然而，拉布拉多寻回犬（0.04±0.005 秒）的 QRS 持续时间倾向于因品种而改变（p<0.1），低于德国牧羊犬（0.05±0.005 秒）。PR 间期受性别影响（p<0.1）。雌性的 PR 间期（0.13±0.005 秒）高于雄性（0.11±0.008 秒）。此外，心电图值不受年龄和体重的显著影响，除了 R 波振幅受年龄统计学影响（p<0.05）。发现犬的 R 波振幅降低与年龄增加之间存在相关性。
不同的心电图参数在正常范围内。年龄对 R 波振幅有显著影响。然而，品种、性别和体重对拉布拉多寻回犬和德国牧羊犬的不同心电图参数无显著影响。
