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TDK conference 2023Vatne Ingeborg Marie - year 6 University of Veterinary Medicine Budapest, Department of Internal Medicine Supervisors: Dr. Manczur Ferenc, Dr. Márton Boros The electrocardiogram (ECG) continues to be a valuable diagnostic tool for health care providers in both human and veterinary care. Its use in daily practice provides an opportunity to perform a variety of tasks overall providing better care for our patients. The aim of this study is to describe the polarity of the PQRS-T waves and their concordance using the 12-lead ECG in healthy dogs and to investigate the trends of the chest and limb leads. The experiment design included healthy dogs older than 6 months old and without known morbidities. The dogs also had to comply to stay in right lateral recumbency, without anaesthesia or behaviour-modifying drugs, for the duration of the ECG monitoring. The study was performed on 70 healthy dogs. After excluding dogs that were not cooperative enough to perform the ECG in the standard right lateral recumbent position and those that showed some ECG abnormality there remained 59 dogs. The 59 dogs belonged to various breeds of both sexes, with different weights and chest confirmations. The median age and weight were 4,7 years and 12kg, respectively. The following breeds had more than 3 individuals: Border collie, Chihuahua, French bulldog, Miniature schnauzer, and Shetland sheepdog. The remaining were either mixed breeds or represented less than 3 individuals of the respective breed. Derived from the collected values, a description of the polarity of the PQRS-T waves in healthy dogs was obtained. The breed of the dog didn’t appear to alter the parameters in the polarity of the waves. The chest lead V1 with a negative P-wave was almost always followed by a negative QRS complex. There were 3 dogs with isoelectric P-waves and one of them also had an isoelectric QRS complex in V1. In the V2-V6 leads the QRS complexes were positive and followed by positive T-waves. However, they were not correlated with the limb leads. The data did support the current literature on the presumption of positive P-waves and QRS complexes in lead I, II, III, aVF and V2-V6 while mostly negative in aVR and V1. The T-wave also proved to be variable in the different leads but showed a higher frequency of positivity in the chest leads V2-V4. The results of our study are intended to contribute to the normal variability of the appearance of ECG waves in different standard leads of the dog. The study will also contribute to the description of the normal appearance of the polarity and concordance of T-waves in healthy dogs although an even larger sample size would have been ideal to investigate the effect of different breeds on these variables. List of lectures |