Ventricular Echoes
- 1 September 1966
- journal article
- research article
- Published by Ovid Technologies (Wolters Kluwer Health) in Circulation Research
- Vol. 19 (3), 638-649
- https://doi.org/10.1161/01.res.19.3.638
Abstract
These experiments were designed to examine further the concept of a dual pathway for AV transmission in the heart, and to determine whether or not the atrium is a necessary link in the reentry pathway used for a ventricular echo. Studies were performed on anesthetized and awake dogs with recording electrodes implanted on the atrium, bundle of His, and right ventricle. When paired stimuli (V1V2) were applied to the ventricle with an appropriate delay, the second stimulated beat was followed by a nonstimulated ventricular echo. The echo response was of supraventricular origin. During paired stimulation with echoes, stimulation of the atrium prior to arrival of the retrograde response to V2 produced a propagated ventricular beat in advance of the expected echo. Stimulation of the atrium immediately after an echo was associated with apparent supernormal AV conduction. These observations support the conclusion that the AV node can be dissociated functionally into at least two pathways. It was possible to render the atrium refractory without abolishing the echo. This finding indicates that the atrium per se does not participate in the reentry path used for ventricular echo.Keywords
This publication has 7 references indexed in Scilit:
- The physiologic basis of reciprocal rhythmProgress in Cardiovascular Diseases, 1966
- Paired pulse stimulation and postextrasystolic potentiation in the heartProgress in Cardiovascular Diseases, 1966
- Re-excitation of the atrium. “The echo phenomenon”American Heart Journal, 1964
- Physiology of Atrioventricular TransmissionCirculation, 1961
- Spread of Activity Through the Atrioventricular NodeCirculation Research, 1960
- Ventricular ‘Echoes’American Journal of Physiology-Legacy Content, 1958
- Two Processes for Auriculo-Ventricular and Ventriculo-Auricular Propagation of Impulses in the HeartAmerican Journal of Physiology-Legacy Content, 1958