[Single-lead bipolar electrocardiography in the diagnosis of heart diseases]

Sixty seven thoroughbred race horse of various age categories were examined electrocardiographically by bipolar leak-apex of the heart -- withers; length of training corresponded to the age categories. Basic time and voltage criteria of EKG were statistically evaluated according to electrocardiographic curves: TF = 35.1 = %/- 6.82 pulses per min., time P = 0.16 +/- 0.03 sec., PQ = 0.03 +/- 0.04 sec., QRS = 0.12 +/- +/- 0.01 sec., TQc = 0.50 sec., R = 2.83 +/- 0.63 mV, Q = 0.38 +/- 0.31 mV. Repolarization phase of the chamber complex, mainly the T wave, is the most variable component of the whole EKG. In the set under study AV block I was found in 14.93%, AV block II in 2.98%, sinoauricular block II in 1.49% and auricular fibrillation in 1.49%. In the paper the basic EKG values and occurrence of arrhythmia in relation to the rate of the training of horses are discussed.