Abstract
Aim: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).Materials and Methods: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.Results: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.Conclusion: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.
Highlights
An electrocardiograph (ECG) is a machine used to measure electrical activity of the heart to evaluate heart rate (HR) and rhythm, conduction, and mean electrical axis (MEA) [1]
There was no significant difference in electrocardiographic parameters across breed and sex
QRS duration tended to alter by breed (p
Summary
An electrocardiograph (ECG) is a machine used to measure electrical activity of the heart to evaluate heart rate (HR) and rhythm, conduction, and mean electrical axis (MEA) [1]. It is a widely used non-invasive tool to determine cardiac arrhythmias, conduction disturbances, and heart morphology in many domestic animals [2,3,4,5,6]. Congenital cardiac defect is most common in Labrador Retrievers [13]. The Creative Commons Public Domain Dedication waiver (http:// creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated
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