AJP - Heart Track the topics, authors and articles important to you
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Am J Physiol Heart Circ Physiol 257: H1446-H1457, 1989;
0363-6135/89 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Dolber, P. C.
Right arrow Articles by Spach, M. S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Dolber, P. C.
Right arrow Articles by Spach, M. S.

AJP - Heart and Circulatory Physiology, Vol 257, Issue 5 1446-H1457, Copyright © 1989 by American Physiological Society

ARTICLES

Structure of canine Bachmann's bundle related to propagation of excitation

P. C. Dolber and M. S. Spach
Department of Pediatrics, Duke University Medical Center, Durham, North Carolina 27710.

Impulse propagation and histology were studied in adult and neonatal canine Bachmann's bundle. Both showed nonuniform electrical anisotropy: effective longitudinal conduction velocity (theta L) markedly exceeded effective transverse conduction velocity (theta T), and extracellular potential waveforms with transverse propagation were polyphasic. An age difference in theta L (0.80 m/s neonate, 1.31 m/s adult) was found; it could be largely accounted for by a difference in myocyte diameter (4.7 microns neonate, 17.1 microns adult). Close apposition of myocytes in the neonate and development of transverse tubules in the adult may have influenced theta L at each stage. Perimysial septa separated fascicles in both neonatal and adult bundles; however, endomysial septa between individual myocytes were completely developed only in adult bundles. Thus perimysial septa were much more responsible for nonuniform anisotropy and low theta T than endomysial septa. Fascicle diameter and length were greater in the adult, which may have affected transverse propagation. Specialized conduction system cells could not be identified.


This article has been cited by other articles:


Home page
 Am. J. Physiol. Heart Circ. Physiol.Home page
A. Nygren, A. E. Lomax, and W. R. Giles
Heterogeneity of action potential durations in isolated mouse left and right atria recorded using voltage-sensitive dye mapping
Am J Physiol Heart Circ Physiol, December 1, 2004; 287(6): H2634 - H2643.
[Abstract] [Full Text] [PDF]

Home page
 Circ. Res.Home page
David M. Harrild, Craig S. Henriquez ;
A Computer Model of Normal Conduction in the Human Atria
Circ. Res., September 29, 2000; 87 (7): e25 - e36.
[Abstract] [Full Text] [PDF]

Home page
 CirculationHome page
H. Sun, E. O. Velipasaoglu, D. E. Wu, H. A. Kopelen, W. A. Zoghbi, W. H. Spencer III, and D. S. Khoury
Simultaneous Multisite Mapping of the Right and the Left Atrial Septum in the Canine Intact Beating Heart
Circulation, July 20, 1999; 100(3): 312 - 319.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Heart Circ. Physiol.Home page
P. C. Dolber, R. P. Bauman, J. C. Rembert, and J. C. Greenfield Jr.
Are interatrial band myocytes maximally hypertrophied in normal canine hearts?
Am J Physiol Heart Circ Physiol, October 1, 1998; 275(4): H1225 - H1235.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online