Changes in Electrocardiographic Parameters with Growth in Thoroughbred Horses and Shetland Ponies
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概要
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The standard values of electrocardiographic parameters, as changing with growth, were determined in Thoroughbred horses and Shetland ponies. The properties of electrocardiograms were compared among the two breeds and Holstein cows. Those of these cows in the course of growth had previously been published. Electrocardiograms in the A-B lead (apexbase bipolar lead) and the standard limb leads were recorded over a period from 1 week to 12 months after birth. The RR, PQ and QT intervals, and the P and QRS durations prolonged distinctly with growth. The deflections of the P wave were generally bifid. Their amplitudes were about 0.2mV for 12 months after birth. The deflections of the QRS complex were classified into rS or QS types in all the cases. In the ponies, the amplitudes of the R spike scarcely appeared after 2 months of age, and that of the S spike decreased with the advance in growth. In the Thoroughbreds, those of the R and S spikes were always stable, regardless of age. The PQ interval and the P wave duration were longer and the QT interval was shorter in the Thoroughbreds than in the ponies or cows. The deflection of the T wave showed characteristic changes in the Thoroughbreds and ponies with the advance in growth. It showed a negative or a negative predominant pattern at a few days of age, a positive predominant one for the following 30 days, and again a negative or negative predominant one after 2 months of age. In the cows, it was basically different. The general direction of the QRS vector on the horizontal plane hardly changed in the Thoroughbreds and ponies until 12 months of age, while it changed in the cows with the advance in age.
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