MEASUREMENT AND ANALYSIS ON THE ELECTROCARDIOGRAMS OF LION-CUBS

The electrolcardiograme of 4. lion-cubs of full sib. which were not anaesthetized and remained conscious and quiet, were studied. Leading methods used included standard limb lead (I, Ⅱ,Ⅲ). and the augmented leads (aVR. aVL, aVF). The results are as follows: The mean hear rate of the lion-cubs was 159±1/min, and a sinus rhythm was shown in all lion cubs. The mean cardiac electrical axis of QRS waves was 68±18°.The average duration of P QRS and T wave was 0. 055±0.004s, 0. 067±0.006s,and 0. 069±10. 012s respectively.The mean interval of R-R, P-R, S-T and Q-T was 0. 378±0. 002s, 0. 082±0. 006s, 0. 078±0. 005s and 0. 225±0. 017s respectively. P wave in leads I,Ⅱ,Ⅲ and aVF is of positive form and that in aVR and aVL, of negative form. QRS complex showed a regularity to a certain degree, presented mainly Rtype. in leadsI,Ⅱ, Ⅲ, aVF, and mainly Q or S type in leads aVR, aVL, There seemed no shift of the S-T segment. The T wave form exhibited no. regularity in lead aVL, however, mainly took the positive form in leads I,Ⅱ,Ⅲand aVF, and mainly negative form in lead aVR.