The authors have investigated the passive electrical properties of the region of the atrioventricular (av.) node of the rabbit heart. All the portions of the av. node have electrotonic anisotropy (ae). The highest degree of ae is reached in the region of entry of the crista terminalis in the av. node and in the lower part of the av. node. The input resistance (Rin) in the av. node exceeds by 1·3-2 times the Rin of the atrial trabeculae. Analysis of the experimental results of the mid-zone of the av. node gives the following values of specific resistances: for the contact membrane 1 Ω · cm2, for the intracellular medium 1200 Ω · cm and for the electrogenic membrane 1300 Ω · cm2. On the basis of these results on the good intercellular interactions in the av. node the nature of the intercellular link and the av. delay is discussed.
|Original language||English (US)|
|Number of pages||7|
|State||Published - Dec 1 1977|
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