Study of the Ambulatory ECG on the Dog:II. Circadian Rhythm of Heart Rate, ST Segmente and Arrhythmia in the Beagle

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Ccontinuous recording of ECGs was performed for 24 hours in ten healthy beagles under the non-anesthetic and unconstraind condition, using a Quiuk-Corder QR-1200 (Fukuda M. E KOGYO Co., ) and a specially designed jacket. Circadian rhythm of the heart rate and that of ST segmental and arrhythmic manifestations were analyzed from the recorded ECGs using Analyzer Model 1230 (Zymed). The results obtained were as follows: 1. Heart rates were divided into a low heart rate period from 23:00 to 9:00 and a high heart rate period from 10:00 to 22:00. Thus, the heart rates tended to decrease during the midnight through early morning and to increase during the daytime. 2. ST levels generally dropped during the midnight through early morning and tended to increase during the daytime through evening. This correlated sligthly with the heart rates. The ST slopes, however, showed significant variations among individuals, with no specific trend over a period of 24 hours. 3. Arrhythmias including sinus arrhythmia, sinus tachycardia, sinus bradycardia, sinus arrest, ventricular premature beat and second-degree A-V block were found throughout the experimental period. Sinus tachycardia was observed during the daytime through evening. On the other hand, sinus arrhythymia, sinus bradycardia, sinus arrest, ventricular premature beat and second-degree A-V block were noted mostly during the midnight through early morning.
日本獣医循環器学会の論文