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Electrotonic spread in the sinoatrial node of the rabbit heart

Name: Electrotonic spread in the sinoatrial node of the rabbit heart
Creator: Felix I. M. Bonke
Keywords: 0301 basic medicine, 0303 health sciences, 03 medical and health sciences, Electric Conductivity, Action Potentials, Animals, Heart Atria, Rabbits, In Vitro Techniques, Extracellular Space

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1973Publisher:Springer Science and Business Media LLCJournal:Pfl�gers Archiv European Journal of Physiology, volume 339, pages 17-23 (issn: 0031-6768, eissn: 1432-2013,

Authors: Felix I. M. Bonke;

doi: 10.1007/bf00586978

pmid: 4735433

Electrotonic spread in the sinoatrial node of the rabbit heart

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Abstract

Using a relatively large extracellular suction electrode (see previous paper for a detailed description of the method) a number of fibers of the sinoatrial node of the rabbit were simultaneously polarized. Although the geometry of the sinoatrial node is very complex and a three-dimensional spread of current is expected, it turned out that with this mode of polarization the current spread in the sinoatrial node was more or less as would be expected in a one-dimensional cable. The space constant was 465±55 μ (n=10). With this relatively small value, electrotonic interaction between all parts of the sinoatrial node is not possible. The functional implications of this finding for the sinoatrial node are discussed.

Related Organizations

University of Bern
Switzerland

Keywords

Electric Conductivity, Action Potentials, Animals, Heart Atria, Rabbits, In Vitro Techniques, Extracellular Space, Microelectrodes, Electric Stimulation, Sinoatrial Node

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