Standard electrocardiographic values in Holstein calves

L.C.N Mendes,A.L.G Alves,R.C.A Souza,A.A Camacho,W.L Ferreira,A.S Borges

doi:10.1590/s0102-09352001000600002

L.C.N Mendes, A.L.G Alves + Show 4 more

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https://doi.org/10.1590/s0102-09352001000600002

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Abstract

This paper presents electrocardiographic values in 25 Holstein calves using the standard bipolar limbs leads (I, II and III), augmented unipolar limb leads (avL, avR and avF) and a bipolar chest lead (V10). Two groups with different ages were compared (newborn - 18 to 72 hours and calves - 27 to 33 days old). It was concluded that no differences between age groups in P, Q, R, S and T waves, in the PR, QRS, QT and ST intervals and in axis orientation were observed.

Highlights

Electrocardiography is a noninvasive, inexpensive technique that yields useful information in classification of arrhythmias, diagnosing conduction abnormalities and it is a valuable aid in prognostic and therapeutic considerations (Fregin, 1985; Claxton, 1988).The electrocardiogram (ECG) provides a record and measure of the varying potential difference that occurs over the surface of the body as the result of electrical activity within the heart
Depolarization of the ventricles occurs with several sequential fronts to produce the QRS complex which is followed by another isoelectric period before repolarization represented by the T wave (Radostits et al, 1994)
The configuration of QRS complexes amplitudes presented negative form because the waves Q and S were frequent in the major cases and R wave was short

Summary

Introduction

The electrocardiogram (ECG) provides a record and measure of the varying potential difference that occurs over the surface of the body as the result of electrical activity within the heart. This is associated with depolarization and repolarization of the myocardium. Depolarization and repolarization of the myocardium occurs in a definite pattern and sequence and the ECG can be used to measure and time these events. The delay in conduction at the AV node is registered by no electrical activity at the body surface and an isoeletric P-R interval on the ECG. Depolarization of the ventricles occurs with several sequential fronts to produce the QRS complex which is followed by another isoelectric period before repolarization represented by the T wave (Radostits et al, 1994)

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