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The electrocardiogram and vector-cardiogram of normal Macaca mulatta in dorsal-supine, right-lateral, left-lateral, and sitting positions



The electrocardiogram and vector-cardiogram of normal Macaca mulatta in dorsal-supine, right-lateral, left-lateral, and sitting positions



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Ecgs and vectorcardio-grams of 11 normal monkeys placed in dorsal-supine, right-lateral, left-lateral, and sitting positions were analyzed and results presented. This information is of immediate importance in determining ecg and vectorcardiographic changes that may be induced in monkeys by lateral impact. Leads taken were I, II, HI, aVR, aVL, aVF, MV1, MV2, and MV3. Parameters analyzed from the ecg lead II included: rhythm, rate, PR interval, P wave duration, PQ segment duration, and QRS duration. The mean P vector projection in the frontal plane was also calculated. Amplitudes of the component deflections in leads I, aVF, and MV1 were determined. Vectorcardiograms were analyzed for: direction of inscription, ratio of length to width, and the mean axis of the QRS vector projected on the three planes for each body posture. This report will serve as a base line for analysis for ecg or vectorcardiographic data analyzed in experiments on monkeys placed in any of the four positions.

Accession: 025779246

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