馬の放血經過中の心電圖學的研究
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概要
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Except for hematological or clinical studies, there is scanty literature which deals with the heart function during bleeding in horse. Electrocardiography is an important method in investigating a heart function. So the writers undertaken an investigation, applying electrocardiogram, of cardiac function during the free bleeding from A. carotis communis sinistra of horse. Our lead was bipolar from two points on the skin which accorded with the long axis of the heart. But the normal value or standard lead of electrocardiogram of horse has not yet been established. The investigation of this problem must be a subject of future research. In this experiment, the writers measured, moreover, volume of blood bleeding per minute. Eight horses were examined. The results obtained are summarized as follows. (1) The volume of bleeding blood per minute reaches its maximum 1 to 3 minutes after the beginning of bleeding. (2) In our lead, S wave did not appear at any time during the experiment. (3) In the process of free bleeding, two types were found : one has ventricular flutter, the other has not. (4) During and after free bleeding, three stages could be observed : the stage of compensation, of fatigue and of survial. a) Stage of compensation. P and T wave go down-ward 1 to 2 minutes after the bleeding begins. The amplitude of R and T wave which is downward increases slowly and attains its maximum at the end of this stage. The RR interval shortens rapidly. The depth of Q wave decreases slowly. The ST segment, which descends more and more steeply, shows a downward convexity. b) Stage of fatigue. The amplitude of R and downward T decreases slowly and clinical death comes at the end of this stage. Arythmia appears in this stage and some of electrocardiograms indicate vetricular flutter. c) Stage of survial. This is the stage in which the action potential of heart can be observed after clinical death.
- 北海道大学の論文