| Autor: |
Julian K. Acker, Howard E. Heyer, E.E. Eddleman, Kathryn Willis, Ernest Poulos |
| Rok vydání: |
1950 |
| Předmět: |
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| Zdroj: |
American Heart Journal. 40:485-503 |
| ISSN: |
0002-8703 |
| DOI: |
10.1016/0002-8703(50)90359-0 |
| Popis: |
The usefulness of the electrokymograph as a tool in the study of cardiovascular dynamics has been demonstrated by several workers in the past few years. 1.2 3 Much of the work has been concerned with the contours of tracings obtained by recording the movements of the various borders of the heart and great vessels. Somewhat less emphasis has been placed on the actual timing of the events of the cardiac cycle. While changes in contour of the border tracings are found in pathologic conditions, the interpretation of these contour changes depends upon a knowledge of the many normal variations. A more fundamental approach to the analysis of electrokymographic tracings is the measurement of the duration of the various phases of the cardiac cycle. The present paper presents data regarding the mean duration and standard deviation of the phases of the cardiac cycle in normal subjects. The effect of the cardiac rate upon the duration of the phases of the cardiac cycle is pointed out, and some of the difficulties in interpretation are discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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