Objective: The determination of’ the relative frequencies and patterns, the mean, standard error and range of the durations and amplitudes of the P wave in the Turkman horse compared to the well known breed of horse in the world (Thoroughbred) Design: A controlled field study
Animals: A total of 123 normal Turkman horses 70% female and 30% male, 36% less than 6-year-old and 64% more than 6-year-old Procedure: After establishment of the horses in the state of maximum - possible tranquillity and standing body position, the ECG was performed
using a battery-driven apparatus in the 12 standard leads 1, 11, III, aVR, aVL, aVF, VI 0, CV6LU, CV6LL, CV6RU, CV6RL and l3A. The speed for all tracings was as 25 mm/sec. and wave voltages as I cm/mv. Statistical analysis: 1-test. Results: The simultaneous were revealed for the first time ECG parameters of the P wave in the 12 equine standard leads. The comparison of the predominant patterns of the P wave in the leads aVR and V10 to the lead BA also showed a mirror-image state in
the orthogonal trigonometric planes. Clinical implications: Considering the parameters revealed for the first time in the field of equine electrocardiography using the
12 standard leads, and on the other hand a remarkable similarities between the ECG of the Turkman and Thoroughbred horses; the
results of this study provided a suitable matter for more
electrocardiographic reseaches in horse species. Meanwhile, equine clinicians would have the essential clinical criteria for the
simultaneous examining of the I 2 ECG leads particularly of the standard lead BA. J. Fac. Vet. Med. Univ’. Tehran.