Changes in the electrocardiogram produced by Ithe narrowing of the ascending aorta in white rats

Beznák, Margit and Dobozy, Elemér and Hajdu, István (1947) Changes in the electrocardiogram produced by Ithe narrowing of the ascending aorta in white rats. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 17. pp. 221-226. ISSN 0365-3005

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Abstract

Electrocardiograms taken of 40 rats before, immediately after, ana then weekly after narrowing the ascending aorta show the following changes: 1. ) Narrowing the ascending aorta causes bradycardia. This is transitory, for the heart rate becomes normal one week later and a decrease occurs again only 4 weeks later. 2. ) A later consequence of the narrowing is the lengthening of the electric systole. 3. ) The T-waves flatten immediately after the narrowing. Later they may again become transitorily positive. 4. ) In the majority of cases ST depression occurs. 5. ) Observed changes are: auricular extrasystoles (2 cases), ventricular extrasystoles (2 cases), auricular fibrillation (2 cases), sinoauricular fibrillation (2 cases) sino-auricular block (1 case), partial block (2 cases), total auriculo-ventricular block (1 case). 6. ) P-pulmonale was observed in 5 cases.

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