Abstract: Background- A novel device that eliminates the need for electrode clips and cables when recording the electrocardiogram (ECG) has been developed for use in dogs. The device consists of a flat metal plate and housing assembly supported by four equidistant metal ball shaped contact electrodes spaced 80mm apart. Hypothesis/Objectives- To identify anatomical locations to record ECGs from the dog’s thorax using the new device, with the dog placed in dorsal recumbency or right lateral recumbency. To develop ECG reference intervals for endurance-trained sled dogs using modified limb lead systems. Animals- Convenience sample of 100 healthy endurance-trained sled dogs. Methods- ECG recordings were obtained from dogs in dorsal and right lateral recumbency by placing the device on the sternum and left lateral thorax, oriented towards the head and dorsocaudal aspect of the left scapula, respectively. ECG measurements were compared to those obtained using standard limb leads. Statistical significance was P < 0.05. Results- Median global ECG values and P, QRS, and T wave amplitudes and morphology recorded by placing the device on the sternum were similar to those obtained using limb lead II with the dogs in right lateral recumbency. Modified limb lead amplitudes and most global ECG indices obtained when the device was placed on the left lateral thorax differed from those obtained using standard limb leads. Conclusions and Clinical Importance- The new device offers potential advantages for continuous monitoring and recording dog ECGs when placed on the sternum or left lateral thorax.
