Abstract

POMPA NUNEZ, Alberto. Morphology and polarity of the T wave of the electrocardiogram in cattle. Rev Salud Anim. [online]. 2019, vol.41, n.3, e05.  Epub Dec 01, 2019. ISSN 0253-570X.

The aim of this research was to determine in which areas of the bovine body surface the electrodes should be placed to record T waves with stable polarity and morphology by using bipolar and unipolar leads to detect alterations in the conduction of the ventricular repolarization impulse. One hundred animals of both sexes from different age groups were used. Each T-wave form was numerically coded and its polarity was classified. Sixteen different forms of T waves were observed, presenting four types of polarity: positive, negative, biphasic +/- and biphasic -/+. In the bipolar shoulder lead IH, the T wave was largely negative or biphasic +/-; and it was positive or biphasic -/+ in the remaining bipolar leads. The T-wave was negative or in some cases biphasic +/- in the unipolar basal leads of the heart. Positive or biphasic polarity was always obtained in the apical leads -/+ and four to six different forms were recorded. It is concluded that, in the areas located towards the base or the apex of the heart, leads can be used originating electrocardiographic records with great stability in the polarity of the T wave and in which the quantity of different forms detected is very reduced, with great predominance of the pointed one, so that they become a very useful reference to diagnose the alterations in the conduction of the repolarization impulse through the cardiac ventricles.

Keywords : T-wave; polarity; morphology; Holstein race; leads.

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