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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine >
Japanese Journal of Veterinary Research >
Volume 3, Number 4 >
STUDIES ON APPLICATIONS OF ELECTROCARDIOGRAM IN HORSES : II. THE LEAD METHOD AND ELECTROCARDIOGRAM WITH SPECIAL REFERENCE TO CONFIGURATIONS AND MEASUREMENTS OF WAVES IN TWO BIPOLAR CHEST LEADS
| Title: | STUDIES ON APPLICATIONS OF ELECTROCARDIOGRAM IN HORSES : II. THE LEAD METHOD AND ELECTROCARDIOGRAM WITH SPECIAL REFERENCE TO CONFIGURATIONS AND MEASUREMENTS OF WAVES IN TWO BIPOLAR CHEST LEADS |
| Authors: | NAKAMURA, Ryoichi Browse this author | | TOO, Kimehiko Browse this author | | MATSUHASHI, Akira Browse this author |
| Issue Date: | 15-Dec-1955 |
| Publisher: | The Graduate School of Veterinary Medicine |
| Journal Title: | Japanese Journal of Veterinary Research |
| Volume: | 3 |
| Issue: | 4 |
| Start Page: | 171 |
| End Page: | 181 |
| Abstract: | Studies were made on the electrocardiograms and calculations of the two types of the bipolar chest lead in the normal horses as a part of the authors' project of electrocardiographic studies. The results thus obtained may be summarized as follows : 1. The changes of the electric potential of the ventricles and those of the endocardium caused by cardiac disorders may be recorded on the electrocardiograms in the bipolar chest lead. 2. The electrocardiograms in leads II and III of the bipolar chest lead I and in leads I and II of the bipolar chest lead II were marked by high amplitudes and unvarying curves. On the contrary, in lead I of the bipolar chest lead I and in lead III of the bipolar chest lead II, the electrocardiograms showed small amplitudes and variable waves. It seems that these interesting facts may be caused by the relationship between the position of the electrodes and the anatomical heart axis. 3. Intricate diphasic and triphasic waves were found in 80〜90% of the P waves. The appearance of this intricate type is usually recognized in the normal horse in the bipolar chest leads I and II. 4. Most of the PQ (PR) segments showed isoelectric waves. 5. Variation in the QRS complex in the bipolar chest leads I and II occurs more frequently in the former than in the latter. 6. The S wave was observed in 30% of S_I of the bipolar chest lead I and in S_<III> of the bipolar chest lead II respectively. The other cases almost always showed the arc-curved S. 7. The monophasic negative T wave was observed in 70〜80% in T_I and T_<II> of the bipolar chest lead I. Diphasic waves were found in 70-80% in T_I and T_<II> of the bipolar chest lead II. Further, monophasic positive waves were usually observed in T_<III> of the bipolar chest leads I and II. 8. It is impossible to compare the values of the amplitudes obtained in the experiment with those of the other investigators', because their selection of the electrode positions differed from that in our method. 9. The mean values of the durations and intervals approach nearly to the results listed in the writers' previous report, and in those of DUKES & BATT and LANNEK & RUTQVIST. |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/1679 |
| Appears in Collections: | Japanese Journal of Veterinary Research > Volume 3, Number 4
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Submitter: 獣医学部図書室
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