The Thai Journal of Veterinary Medicine


Prapa Loypetjra


The electrocardiogram of wildlife animals was recorded using hexaxial lead system. The animals were seventeen crocodiles, one gibbon, three lorises, three tigers, four elephants and one binturong. All of them were conscious during the measurement. The Lead II of electrocardiogram was used in evaluating heart rate, rhythm and measuring the amplitude, time interval and segment. Standard limb leads were employed to calculate mean electrical axis of the ventricles. Electrocardiopgraphic features of P, QRS and T waves in all species were normal without slurring or notching. The values of heart rate per minute of crocodile, gibbon, loris, tiger, elephant and binturong were 43-65, 166, 125-214, 90-154, 35-49 and 150, respectively. The duration of P wave in crocodile was between 0.051-0.179 sec., QRS wave was 0.108-0.158 sec, P-R interval was between 0.24-0.42 sec., and Q-T interval was between 0.282-0.454 sec. P wave duration in gibbon, loris, tiger, elephant and binturong were nearly the same which were 0.04 to 0.08 sec. The mean eletrical axes were between 66°-72°, 57°, 110°, 70°-85°, 40°-90° and 120° in crocodile, gibbon, loris, tiger, elephant and binturong, respectively. The large variation of the ECG values within species was thought to be the unrestrained and exciting effects. However, this was considered to be normal and could be found in each species.

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