Resumo

POMPA-NUNEZ, Alberto  e  CAMEJO-ZAMORA, Maikel. Morphology and polarity of the P wave of the electrocardiogram in cattle. Rev Salud Anim. [online]. 2019, vol.41, n.1  Epub 01-Abr-2019. ISSN 2224-4700.

The objective of this work was to determine the polarity and morphology of the P wave of the electrocardiogram (ECG) of cattle in bipolar and monopolar derivations. Electrocardiographic records of 100 animals (Holstein breed), clinically healthy and belonging to different age groups and both sexes, were obtained. They were: 20 calves (10 females and 10 males), 20 heifers, 10 lactating cows, 25 young stallions already incorporated to the semen extraction plan, and 25 adult stallions, in 20 derivations (nine bipolar and 11 monopolar). P waves were coded according to their morphology. The frequency with which their different forms and the type of polarity appear in each of the derivations used, was determined. As a result, it was obtained that the lowest variability with respect to morphology and polarity was shown in the bipolar derivations of the shoulder, in the base-apex derivations, as well as in those monopolar derivations located towards the base or the apex of the heart. It is concluded that when the 12 classical derivations, established in humans, are used in quadrupeds, the polarity and morphology obtained for the P wave is very variable. However, it was shown that there are other points in which there is stability in the polarity of this wave and a smaller number of different configurations.

Palavras-chave : monopolar and bipolar derivations; ECG; morphology; P wave; polarity; Holstein breed.

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