STUDIES ON APPLICATIONS OF ELECTROCARDIOGRAMS IN HORSES : III. THE LEAD METHOD AND ELECTROCARDIOGRAM WITH SPECIAL REFERENCE TO CONFIGURATIONS AND MEASUREMENTS OF WAVES IN SEWI-UNIPOLAR CHEST LEADS

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Studies were made on the electrocardiogram of the semi-unipolar chest lead in which the anus was selected for the position of the indifferent electrode in the normal horse as a part of the authors' project of electrocardiographic studies. The results obtained are summarized as follows : 1. Concerning the position of the indifferent electrode, the authors considered that the anus is the suitable position, for the clinical application, when the semiunipolar chest lead is used. 2. The different electrode positions on the region near the heart must be chosen at least on the left and right sides. 3. Intricate positive or negative diphasic and triphasic waves were found mostly in the P wave. The appearance of this intricate type is usually recognized in the normal horse electrocardiogram using the semi-unipolar lead. 4. Most of the PQ (PR) segments showed descending and isoelectric curves. 5. The Q wave was generally observed in each lead. 6. The variation of the QRS complex being caused by the positional changes of the different electrode is as follows : On the position 2 the wave showed the negative deflection or diphasic ; on the positions 3 and 4 the QRS complex takes the form of the positive wave with high amplitude ; on the positions 5 and 6 the upward deflection was observed. 7. The S wave was found in the CA_1〜CA_3,CA_8 and CA_9. The other leads almost always showed the arc curved S. 8. Diphasic wave with negative deflection after positive and negative monophasic waves was mostly observed in T wave. 9. The position which indicated the highest amplitude and the measurement values in each wave are as follows : That is, 0.36 mv in P_1 and -0.32 mv in P_6,-1.72 mv in Q_2,1.37 mv in R_6,-1.112 mv in S_2 and 1.44 mv in T^1_7 with -0.22 mv in T^2_7. 10. The values of the durations and intervals approach closely to the results listed in the report of UEDA et al. 11. It is suggested that the semi-unipolar chest lead herein described may be of value for clinical application in diagnosing heart disorders.
北海道大学の論文
1956-03-26

STUDIES ON APPLICATIONS OF ELECTROCARDIOGRAMS IN HORSES : III. THE LEAD METHOD AND ELECTROCARDIOGRAM WITH SPECIAL REFERENCE TO CONFIGURATIONS AND MEASUREMENTS OF WAVES IN SEWI-UNIPOLAR CHEST LEADS

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