Electrocardiographic parameters of amplitude and the shape of waves on the unipolar precordial chest leads in the normal Korean native cattles have been measured with a 3 channel electrocardiograph built in a computed and analysis. The study was conducted on 98 heads of mean age of 17.6 months. The wave forms of P, T and QRS complex wave in all leads showed various types. The parameters of the amplitude in the wave types showed the most. frequency in each lead that were analyzed as follow :
1. In P wave, amplitudes of positive type showed a frequency of 92.%6 and 93.9% in leads CV_6LU and CV_6LL that were 83.8±31.0㎶ and 76.0±30.7㎶, and negative type showed a frequency of 97.9% in lead V 10 that were -80.2±29.4㎶, respectively. But the plate type in leads CV_6RU and CV_6RL showed frequency of 4896 and 58.3%, respectively.
2. Average amplitude of the QRS complex were in a range of 277.0±154.0㎶ to 648.2±146.2㎶(mean of 418.8±139.4㎶) in all leads that were manifested the Low-Voltage QRS complex(below I ㎷ in unipolar precordial leads). Average amplitudes of each wave type in the QRS complex were -250.0±139.8㎶ and -399.2±226.8㎶ in the QS group types that showed a frequency of 50.0% and 82.5% in the leads CV_6LU and CV_6LL, respectively. And average amplitudes of the R group types showed a frequency of 85.6%, 56.1% and 75.8% in the CV_6RU, CV_6RL and V_(10) that were 321.5±142.2㎶, 271.6±139.9㎶ and 552.4±132.7㎶, respectively.
3. In T waves, Amplitudes of the positive type showed a frequency of 60.2%, 46.9% and 83.7% in leads of CV_6LL, CV_6RU and CV_6RL that were respectively 184.7±93.7㎶ 103.7±64.43㎶ and 111.8±39.3㎶, the negative type showed a frequency of 62.2% and 93.?% in leads CV_6LU and V_(10) that were 142.2±82.1㎶ and -280.3±107.2㎶, respectively.
4. Average amplitude of ST segment were 3.7±33.11㎶ , 0.9±23.1㎶, 10.9±28.6㎶, 5.8±28.3㎶ and -34.7±48.4㎶ in leads CV_6LL, CV_6RU, CV_6RL, CV_6LU and V_(10) respectively.
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